tag:blogger.com,1999:blog-78056472598872764552024-03-05T04:52:37.950+00:00Uma Química Irresistível2011 foi o Ano Internacional da Química - um bom pretexto para falar de Química! Criámos este blog com que gostávamos de contribuir para mostrar que a Química está presente no quotidiano e que os conhecimentos químicos, sempre que bem aplicados, contribuíram muito positivamente para a nossa vida. Gostávamos também de contrariar o ambiente de temores generalizados em relação à Química.
Esperamos conseguir despertar o seu interesse e mostrar-lhe porque achamos que a Química é mesmo Irresistível!Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.comBlogger455125tag:blogger.com,1999:blog-7805647259887276455.post-12103208126763604412016-07-21T23:37:00.000+01:002016-07-21T23:44:59.255+01:00Os mágicos poderes das antocianinas<div class="sapomedia images" style="text-align: center;">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=iLDToUbeDQhofomNgcBf" title="06BUTTERFLY-WEB1-master768.jpg"><img alt="06BUTTERFLY-WEB1-master768.jpg" src="http://7.fotos.web.sapo.io/i/Bab048167/19786461_ILKoe.jpeg" height="333" style="padding: 10px 10px;" title="06BUTTERFLY-WEB1-master768.jpg" width="500" /></a></div>
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Segundo <a href="http://www.nytimes.com/2016/07/06/dining/blue-cocktails-blure-butterfly-pea-flower.html?ref=dining" target="_blank">um artigo</a>
do The New York Times o cocktail acima, chamado Disco Sour, e servido
no bar 492 em Charleston, S.C. faz imenso sucesso. Quando o líquido do
jarro é deitado no copo onde estão os cubos de gelo azuis a cor do
cocktail começa a mudar, e ao longo do tempo vai ficando cada vez mais
de um violeta escuro.</div>
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Parece mágico, mas é só química. Para aqueles a quem a palavra assusta, calma! É uma coisa "natural" (<a href="http://assinseassados.blogs.sapo.pt/o-que-e-natural-nem-sempre-e-bom-1302" target="_blank">seja o que isso signifique</a>...).
Um corante de uma flor que muda de cor com o pH. Ou seja, no caso, com o
aumento de acidez devido ao líquido do jarro que tem sumo de limão.</div>
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<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=AmLJZtQ9Av8PWzdIhshI" title="Butterfly_Pea_Double_Flower_(_Clitoria_Ternatea_)."><img alt="Butterfly_Pea_Double_Flower_(_Clitoria_Ternatea_)." src="http://7.fotos.web.sapo.io/i/Ba20410b6/19786496_1uRLJ.jpeg" height="442" style="padding: 10px 10px;" title="Butterfly_Pea_Double_Flower_(_Clitoria_Ternatea_)." width="500" /></a></div>
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Diz <span class="caption-text">Megan Deschaine</span>, gerente do bar:</div>
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<i>"Most drinkers there have guessed that the mash-up of yellow liquid and blue cubes would yield a green, not a purple, potion.</i></div>
<div class="story-body-text story-content" data-node-uid="1" data-para-count="77" data-total-count="3339" style="text-align: justify;">
<i>The only person who was able to guess it right was a chemist.”</i></div>
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<div class="story-body-text story-content" data-node-uid="1" data-para-count="77" data-total-count="3339" style="text-align: justify;">
Não admira... é quem está familiarizado com as <a href="http://umaquimicairresistivel.blogspot.pt/2011/03/antocianinas-parece-esquisito-mas-estas.html" target="_blank">antocianinas</a> e as suas <a href="http://umaquimicairresistivel.blogspot.pt/2011/03/parece-magia-mas-e-quimica.html" target="_blank">propriedades</a>...</div>
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<span style="font-size: 10pt;">Última foto <a href="https://commons.wikimedia.org/wiki/File:Butterfly_Pea_Double_Flower_%28_Clitoria_Ternatea_%29.JPG" target="_blank">DAQUI</a></span></div>
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<span style="font-size: 10pt;"><span style="font-size: small;">Post publicado originalmente no blog <a href="http://assinseassados.blogs.sapo.pt/" target="_blank">Assins & Assados</a> </span></span></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-5115299303739049742016-06-26T11:10:00.000+01:002016-06-26T11:10:02.377+01:00Química na Arte XXXVII<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfHzWX5qxgDdznUqAjv8v7KTTRxrRjYOC2WklGsxzDnwC93Bm4H9W3c5v3IYucYhX3j6E-ugUh8NqZF4sZviT-San_HFa7ZOy9TbPdGbpRXYSLWSXURmPB8Fr_eAqoaqn2dUS_NwmmO-Q/s1600/ironia+ao+natural.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfHzWX5qxgDdznUqAjv8v7KTTRxrRjYOC2WklGsxzDnwC93Bm4H9W3c5v3IYucYhX3j6E-ugUh8NqZF4sZviT-San_HFa7ZOy9TbPdGbpRXYSLWSXURmPB8Fr_eAqoaqn2dUS_NwmmO-Q/s320/ironia+ao+natural.png" width="251" /></a></div>
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<br />
<h1 align="center" style="text-align: center;">
<a href="https://www.blogger.com/null" name="_Toc321689996"></a></h1>
<div class="MsoNormal" style="text-align: center;">
<span style="font-size: large;"><b><span style="font-family: "arial" , sans-serif;">Ironia ao Natural</span></b></span><br />
<br />
<span style="font-family: "arial" , sans-serif;">É natural,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">é bom</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">e quanto mais
melhor,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">como os
cogumelos</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">vermelhos, </span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">as rãs azuis</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">ou o suco de
serpente...</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">É químico, </span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">processado,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">é mau,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">como a</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">aspirina,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">um perfume</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">ou o plástico</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">da válvula</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">cardíaca </span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">de um
coração...</span></div>
<div class="MsoNormal" style="text-align: center;">
<br /></div>
<br />
<div style="text-align: left;">
</div>
<div style="text-align: left;">
<span style="font-family: "arial" , sans-serif;">João Paiva</span></div>
<div style="text-align: left;">
<a href="http://www.spq.pt/files/docs/boletim/poesia/quase-poesia-quase-quimica-jpaiva2012.pdf" target="_blank"><span style="font-family: "arial" , sans-serif;">Quase Poesia Quase Química</span></a></div>
<div style="text-align: left;">
</div>
<div style="text-align: left;">
<span style="font-family: "arial" , sans-serif;">Ilustração de Afonso Paiva </span><br />
<br />
<span style="font-family: "arial" , sans-serif;"><span style="font-size: x-small;">(Publicado simultâneamente no<span style="font-family: "arial" , sans-serif;"> meu outro blog <a href="http://assinseassados.blogs.sapo.pt/" target="_blank">Assins & Assados</a>)</span></span> </span></div>
<br />
<div class="MsoNormal" style="text-align: left;">
<br /></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-3907901952096543512016-06-24T14:19:00.000+01:002016-06-26T11:12:16.209+01:00O que é natural nem sempre é bom<div class="sapomedia images">
<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-Qc-TuoIzM6ZkmDE1eJKDavbit1wV28oz6y_086ToaYeuAHtULwPCdkX3dfeAzbJjc_jmngOAeqwUxT-U_gLHjKSSCH_n_YgtWYeP3Z8lzh-ScTbdcbdC_KbZs_GzeWwl9y6jL8AfH_0/s1600/19187917_3mtAR.jpeg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-Qc-TuoIzM6ZkmDE1eJKDavbit1wV28oz6y_086ToaYeuAHtULwPCdkX3dfeAzbJjc_jmngOAeqwUxT-U_gLHjKSSCH_n_YgtWYeP3Z8lzh-ScTbdcbdC_KbZs_GzeWwl9y6jL8AfH_0/s400/19187917_3mtAR.jpeg" width="400" /></a></div>
<br />
<br />
<br />
Há coisas que de tão intuitivas, virtuosas até, parecem uma verdade indiscutível… Mas serão? Muitas não.</div>
<br />
<div style="text-align: center;">
<b>“Come que é tudo natural!”</b></div>
<br />
<div style="text-align: justify;">
Se me dizem isto apetece-me logo
perguntar: O que é que significa natural? O que é que isso garante?
Significa que é mais saudável?</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
De facto, o que é considerado "natural",
são por vezes coisas bem diferentes. Algumas altamente processadas. E
será mau o facto de serem processadas? Não necessariamente.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Quanto às coisas naturais serem
saudáveis… Infelizmente as coisas não são tão simples. É sempre preciso
mais conhecimento, mas conhecimento bem fundamentado, em fontes
credíveis. Os venenos mais potentes existem na natureza, e o homem até
aprendeu a evitá-los ou, empiricamente, a eliminá-los. O caso da
mandioca brava é um bom exemplo. É muito rica em cianeto, e alguns povos
desenvolveram ao longo de séculos técnicas para a processar e eliminar o
cianeto de forma a poderem consumi-la, é fascinante. Ou seja, a
mandioca tem que ser altamente processada para se tornar num alimento
saudável.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Num mundo não muito seguro, e em que a
informação que nos chega é por vezes complexa e confusa, recorremos a
várias âncoras, como esta do "natural", para criar zonas de segurança.
Mas podem ser falsas zonas de segurança. A indústria e o comércio
exploram esta, nem sempre justificada, associação entre o natural, o
saudável e o seguro para vender. A imprensa bombardeia-nos com
informação sem nenhum fundamento sobre os benefícios do “natural” <i>versus</i> um também mal definido “processado”.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Nem sempre o que parece é, e nem sempre o
que é intuitivo é verdade. É urgente que se invista mais em educação e
que estes conceitos comecem a ser clarificados na escola, talvez assim
dentro de alguns anos os consumidores sejam mais informados, críticos e
exigentes e façam escolhas mais racionais.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<span style="font-size: 8pt;">Imagem <a href="http://www.indiatimes.com/health/healthyliving/13-natural-food-preservatives-237373.html">DAQUI</a></span></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<span style="font-size: 8pt;">Post inicialment publicado no blog <a href="http://assinseassados.blogs.sapo.pt/o-que-e-natural-nem-sempre-e-bom-1302" target="_blank">Assins & Assados </a></span></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-17252795950885986462016-06-13T14:07:00.000+01:002016-06-13T14:07:27.851+01:00Mel cremoso, uma invenção genial<div class="sapomedia images" style="text-align: center;">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=GqhFroJw1tTVmRazzzOH" title="mel3.jpg"><img alt="mel3.jpg" height="263" src="http://7.fotos.web.sapo.io/i/Baf08f59c/19410862_OuSBE.jpeg" style="padding: 10px 10px;" title="mel3.jpg" width="500" /></a></div>
<div class="sapomedia images">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=wlQ3ksnnzZGZtDIQMHJ3" title="azulclaro.jpg"><br /></a></div>
<br />
<div style="text-align: justify;">
Não sou uma pessoa muito observadora.
Tenho pena, porque há coisas interessantes que me escapam completamente.
Há uns anos, num pequeno almoço num hotel em Copenhaga, disseram-me "Já
reparaste que o mel é cremoso e que dá para barrar?". Não, não tinha
reparado... E a pergunta seguinte foi "O que é que eles adicionarão ao
mel para ficar assim?". Não sabia, mas fiquei com curiosidade. Não fosse
dar jeito... meti 2 ou 3 doses de mel na carteira. Foi a minha sorte!</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
A Patrícia de vez em quando diz "O
google é o nosso melhor amigo." E tenho que lhe dar alguma razão.
Cheguei, googlei e logo descobri que era apenas mel que tinha sido
cristalizado. De facto, o mel é uma solução sobressaturada de açúcar, em
geral mais de 70% de açúcar e menos de 20% de água, e sendo assim é
instável. Por isso frequentemente cristaliza.</div>
<div style="text-align: justify;">
<br /></div>
<div class="sapomedia images" style="text-align: center;">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=ZAmSIWnVKRZkQAZHk8yA" title="Honey-Pie.jpg"><img alt="Honey-Pie.jpg" height="243" src="http://7.fotos.web.sapo.io/i/B9904dae7/19410888_9lHoC.jpeg" style="padding: 10px 10px;" title="Honey-Pie.jpg" width="500" /></a></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Os principais açúcares no mel são a
frutose e a glucose, em geral um pouco mais de frutose do que de
glucose. O açúcar que cristaliza é a glucose, pois a sua solubilidade em
água (910 g/L a 25 ºC) é menor que a da frutose (3750 g/L a 20 ºC),
sendo esta mais difícil de cristalizar.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Ainda há dias fui dar com uma embalagem
de um mel que quando comprei era fluido e agora, com o tempo mais frio,
tinha cristalizado. Quando isto acontece o mel pode ficar menos
agradável de comer, se os cristais forem grandes vão tornar o mel
arenoso. No entanto, se os cristais forem muito pequenos, o mel fica
transformado num creme com uma textura muito agradável, e que dá para
barrar. Tem ainda a vantagem de não se sujar tudo à volta com pingos de
mel.</div>
<br />
<div style="text-align: justify;">
O que fazem alguns produtores de mel, é
cristalizarem o mel de forma controlada, de modo a se formarem muitos
cristais pequenos, obtendo um mel que muita gente prefere por ser
igualmente saboroso e mais fácil de usar. Um processo há muito usado, a
patente foi registada em 1935 por Elton J. Dyce. Era assim que aquele
mel era produzido, nada lhe tinha sido adicionado. Tinha apenas sido
cristalizado.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Googlando encontrei logo instruções para
fazer este mel cremoso. Bastava misturar bem 10% do melhor mel cremoso
que encontrasse, com 90% do mel fluido que desejava cristalizar, pôr em
lugar fresco e esperar. Os cristais que se adicionam induzem a
cristalização e vão determinar a forma dos cristais que se vão formar.
Assim fiz, usando os pacotinhos que tinha trazido de Copenhaga. Coloquei
num local fresco e duas semanas depois tinham um frasco de mel cremoso.</div>
<div style="text-align: justify;">
<br /></div>
<div class="sapomedia images" style="text-align: center;">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=LFY3nHITm5Vc4kkpmv4y" title="mel4.jpg"><img alt="mel4.jpg" height="363" src="http://2.fotos.web.sapo.io/i/Bab09ee8d/19410914_FDfte.jpeg" style="padding: 10px 10px;" title="mel4.jpg" width="500" /></a></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Uns dias depois no supermercado, vi que há à venda mel cremoso produzido cá pela <a href="http://serramel.pt/pt">SerraMel</a>.
Um óptimo mel cremoso de flores de laranjeira. Saboroso e com uma
óptima textura, bem sedosa. É esse que uso agora quando quero um bom mel
cremoso.</div>
<br />
<div class="sapomedia images">
<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=wswcvipnvubaNZvhBcA3" title="mel2.jpg"><img alt="mel2.jpg" height="360" src="http://8.fotos.web.sapo.io/i/B7108bdc7/19410920_EJGni.jpeg" style="display: block; margin-left: auto; margin-right: auto; padding: 10px;" title="mel2.jpg" width="500" /></a></div>
<div class="sapomedia images">
<br /></div>
<br />
<span style="font-size: 8pt;">Gráfico com a composição do mel <a href="http://www.hunaja.fi/en/abouthoney/texture-and-composition/" target="_blank">DAQUI</a></span><br />
<br />
<br />
<span style="font-size: 8pt;">Post inicialmente publicado no blog <a href="http://assinseassados.blogs.sapo.pt/mel-cremoso-uma-invencao-genial-21490" target="_blank">Assins & Assados </a></span>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-48227472383456609752016-06-04T17:05:00.000+01:002016-06-04T17:18:41.871+01:00Química na Arte XXXVI<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxo1jaXoHO5PuTZ0LaYtu3dhAxHNdmDghbo2IFWgZXTua4fXkzm3SApDdiUtlEuGSjQNRE8zSLZzxFnlITPGM5cnr2NzThjsmkos40lY1Z-7P5BZW3XkW9Rf9n4zZJe3SgDdRO87CtYbE/s1600/carbono.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxo1jaXoHO5PuTZ0LaYtu3dhAxHNdmDghbo2IFWgZXTua4fXkzm3SApDdiUtlEuGSjQNRE8zSLZzxFnlITPGM5cnr2NzThjsmkos40lY1Z-7P5BZW3XkW9Rf9n4zZJe3SgDdRO87CtYbE/s320/carbono.png" width="251" /></a></div>
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<br />
<h1 align="center" style="text-align: center;">
<a href="https://www.blogger.com/null" name="_Toc321689989"></a><a href="https://www.blogger.com/null" name="_Toc321551989"><span style="mso-bookmark: _Toc321689989;"><span style="font-size: 14.0pt;">Carbono-lição</span></span></a><span style="font-size: 14.0pt;"></span></h1>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">Agregado </span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">de modos</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">diferentes,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">tu, carbono,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">és quase</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">concreto</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">ilusão.</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">Grafite, </span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">camadas</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">diamante</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">cruzadas,</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">resistente</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">duração.</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">Tua virtude</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">maior:</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">Fazer muita</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">ligação.</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">Para nós...</span></div>
<div class="MsoNormal" style="text-align: center;">
<span style="font-family: "arial" , sans-serif;">uma lição!...</span><br />
<br />
<div style="text-align: left;">
<span style="font-family: "arial" , sans-serif;">João Paiva</span></div>
<div style="text-align: left;">
<a href="http://www.spq.pt/files/docs/boletim/poesia/quase-poesia-quase-quimica-jpaiva2012.pdf" target="_blank"><span style="font-family: "arial" , sans-serif;">Quase Poesia Quase Química</span></a></div>
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<span style="font-family: "arial" , sans-serif;">Ilustração de <span style="font-family: "arial" , sans-serif;">Afonso</span> Paiva </span></div>
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Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-2663075712296878222016-06-02T14:03:00.000+01:002016-06-02T14:03:01.920+01:00O MSG é mau para nós?
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<a class="media-link" href="http://fotos.sapo.pt/mpm5/fotos/?uid=HftBtj4rSpSgWBtvs8Nh" title="Peter-Barham-470x500.jpg"><img alt="Peter-Barham-470x500.jpg" height="531" src="http://1.fotos.web.sapo.io/i/Be104efe9/19584855_ZbjGn.jpeg" style="display: block; margin-left: auto; margin-right: auto; padding: 10px;" title="Peter-Barham-470x500.jpg" width="500" /></a></div>
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Acabei de ler uma <a href="http://www.labnews.co.uk/interviews/big-ask/chef-de-science-04-05-2016/" target="_blank">entrevista com Peter Barham</a>,
um físico inglês da Universidade de Bristol e uma das questões que lhe puseram
relacionava-se com o facto do MSG* ter efeitos negativos para a nossa
saúde. Como tenho reparado haver muitos equívocos a propósito deste
assunto, achei importante colocar aqui a resposta. Já agora, a leitura
da entrevista pode ser interessante.</div>
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<span class="" id="result_box" lang="pt"><span title="Is MSG bad for us?"><strong><em>O MSG é mau para nós?</em></strong><br /></span><em><span title="Due to a lot of bad press that has no foundation many people believe that monosodium glutamate MSG) is somehow harmful.">Devido
a bastante má imprensa, que não tem fundamento, muitas pessoas
acreditam que o glutamato monossódico (MSG) é de alguma forma
prejudicial. </span><span title="There are plenty of people who will tell you they are allergic to MSG – they report it gives them headaches and stomach cramps.">Há bastantes pessoas que lhe vão dizer que são alérgicas ao MSG - referem que lhes dá dores de cabeça e de estômago. </span><span title="However, in fact there are no known cases of anyone actually being allergic to MSG.">No entanto, na verdade, não há casos conhecidos de alguém realmente ser alérgica a MSG. </span><span title="The myth comes from a doctor in the USA who noticed that a number of his patients who reported of headaches and stomach cramps had eaten Chinese food shortly before the symptoms occurred.">O
mito teve origem num médico nos EUA que reparou que vários dos seus
pacientes que relatavam ter dores de cabeça e dores no estômago tinha
comido comida chinesa pouco antes dos sintomas ocorrerem. </span><span title="He then made one of those intuitive leaps of logic to draw totally erroneous conclusions.">Fez então uma dedução </span></em></span><em><span class="" id="result_box" lang="pt"><span title="He then made one of those intuitive leaps of logic to draw totally erroneous conclusions.">lógica</span></span><span class="" id="result_box" lang="pt"><span title="He then made one of those intuitive leaps of logic to draw totally erroneous conclusions."> intuitiva que o levou a tirar conclusões totalmente erradas. A</span></span><span class="" id="result_box" lang="pt"><span title="Chinese food has MSG added;">diciona-se MSG à </span></span><span class="" id="result_box" lang="pt"><span title="Chinese food has MSG added;">comida chinesa; </span><span title="eating Chinese food gives headaches and cramps;">comer comida chinesa dá dores de cabeça e de estômago; </span><span title="therefore, MSG causes the symptoms.">por conseguinte, o MSG causa estes sintomas. I</span><span title="He totally ignored the large amounts of MSG these patients were eating in other foodstuffs to which MSG had not been added.">gnorou
totalmente os grandes quantidades de MSG que estes pacientes comiam
noutros produtos alimentares a que não tinha sido adicionado MSG. </span><span title="There are large amounts of MSG in cheeses – notably parmesan cheese where you can even see it with the naked eye – the white flecks are largely crystals of MSG.">Existem grandes quantidades de MSG em queijos - </span></span><span class="" id="result_box" lang="pt"><span title="There are large amounts of MSG in cheeses – notably parmesan cheese where you can even see it with the naked eye – the white flecks are largely crystals of MSG."> nomeadamente no </span></span><span class="" id="result_box" lang="pt"><span title="There are large amounts of MSG in cheeses – notably parmesan cheese where you can even see it with the naked eye – the white flecks are largely crystals of MSG.">queijo parmesão onde pode até sr visto a olho nu - as manchas brancas são em grande parte cristais de MSG. </span><span title="While it seems true that some people have some sort of reaction to Chinese food it is simple to demonstrate that this is not due to MSG.">Embora
pareça verdade que algumas pessoas têm algum tipo de reação à comida
chinesa, é simples de demonstrar que esta não é devido ao MSG. </span><span title="Several experiments have been carried out where people who suffer the syndrome have been given Chinese meals with no added MSG and have reported the symptoms, and then given an Italian meal with lots of MSG and reported no ill effects whatsoever">Várias
experiências foram realizadas em que a pessoas que sofrem desta
síndrome foram dadas refeições chinesas sem adição de MSG e relataram os
sintomas e, em seguida, dada uma refeição italiana com muito MSG e não
relataram quaisquer efeitos prejudiciais.</span></span></em></div>
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* <span class="st">Glutamato monossódico, também conhecido como glutamato de sódio. Um dos compostos responsáveis pelo gosto umami.</span></div>
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<span class="st" style="font-size: 10pt;">Foto <a href="http://www.bristol.ac.uk/news/2010/6861.html" target="_blank">DAQUI</a></span></div>
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<span class="st" style="font-size: 10pt;">Post adaptado de um publicado inicialmente no blog <a href="http://assinseassados.blogs.sapo.pt/o-msg-e-mau-para-nos-30361" target="_blank">Assins & Assados</a> </span></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-76061065916396228592016-05-29T13:56:00.001+01:002016-05-29T13:56:36.668+01:00Moléculas naturais<br />
A natureza sabe o que faz.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiq2DVJkWbEHa2LcUcn89gPBqyJJvTR3G4YbseS2lBbXTj8iVBH6R-hc-dS4bxOnsg1bVwTi8YY0vU7xYYUm6BCHMxQbcR8DdEADGiuf0umyyyIGVM_4No58NNKkCG7M2Q6anbQHes2qSk/s1600/13240024_999363826799090_6972004812407832806_n.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiq2DVJkWbEHa2LcUcn89gPBqyJJvTR3G4YbseS2lBbXTj8iVBH6R-hc-dS4bxOnsg1bVwTi8YY0vU7xYYUm6BCHMxQbcR8DdEADGiuf0umyyyIGVM_4No58NNKkCG7M2Q6anbQHes2qSk/s320/13240024_999363826799090_6972004812407832806_n.jpg" width="320" /></a></div>
<br />Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com1tag:blogger.com,1999:blog-7805647259887276455.post-75018887860788263172015-06-30T19:13:00.000+01:002015-06-30T19:21:04.807+01:00E já que estamos na época dos morangos...Decidimos dar-lhe alguma imformação sobre a sua composição química. Esta imagem é bem elucidativa:<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9UxMwBu7yreFg68vwZa0mBswD11wLOVxtjqGAFf2cP3Cls8c5If1R4H1q5qVAS7s4i7vQSb45q5oWombWgjOLXlwjqeGWZ764Htek6ATwSfPUd9NYEIIv5liCkTVg_q1a5ciLSUTTGjQ/s1600/ingredients-of-an-all-natural-strawberry-english.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9UxMwBu7yreFg68vwZa0mBswD11wLOVxtjqGAFf2cP3Cls8c5If1R4H1q5qVAS7s4i7vQSb45q5oWombWgjOLXlwjqeGWZ764Htek6ATwSfPUd9NYEIIv5liCkTVg_q1a5ciLSUTTGjQ/s640/ingredients-of-an-all-natural-strawberry-english.jpg" width="451" /></a></div>
Imagem de: https://jameskennedymonash.wordpress.com/category/infographics/ <br />
Aconselhamos visitar o site, pois tem um conjunto de informações muito interessante.Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-88635625215981403322015-06-05T07:59:00.000+01:002015-06-05T07:59:00.062+01:00Bacalhau à Zé do Pipo - III<!--[if !mso]>
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</o:shapelayout></xml><![endif]--><span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Este é o último post sobre o Bacalhau à Zé do Pipo. Falemos então do puré de batata. Ao cozer as batatas também está a
proceder à gelatinização do amido da batata. Mas o que se calhar não sabia é
que o sabor da batata, apesar de discreto, resulta da presença de um elevado
número de compostos químicos que têm nomes tão estranhos como
2,3-dimetil-5-etilpirazina ou 4-hidroxi-2,5-dimetil-3(2H)-furanona. Muito mais
se poderia dizer, mas fiquemos por aqui porque temos que falar da maionese. </span><br />
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Fazer maionese é preparar uma emulsão. Sabemos bem que o azeite e
a água não se dão. Nem bem, nem mal; não se dão mesmo. Basta adicionar um pouco
de azeite a água e, mesmo mexendo a mistura muito bem, passado pouco tempo lá
vai cada um deles para o seu lado: o azeite em cima (uma vez que é menos denso)
e água em baixo. Diz-se que a mistura se separa em duas fases. E nada os
convence a estabelecerem uma relação amigável. Bom, nada não é a palavra certa,
como iremos ver…</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbKXdeQGrn_pr6Gn_S247G3cvO3NGEqwiY66MB4ub-QKrXxQNB-9AmoEPCcX7q0lfCKS1p2-ORT6TYGmgMxSi0cYil2cCQwvbqw1iK1dgDXJj951jFJgd_g0Q_cji4u0d2fAsOm-Z-ijw/s1600/maionese.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbKXdeQGrn_pr6Gn_S247G3cvO3NGEqwiY66MB4ub-QKrXxQNB-9AmoEPCcX7q0lfCKS1p2-ORT6TYGmgMxSi0cYil2cCQwvbqw1iK1dgDXJj951jFJgd_g0Q_cji4u0d2fAsOm-Z-ijw/s400/maionese.jpg" width="400" /></a></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">De uma maneira muito simplificada, podemos dizer que há
substâncias que gostam da água e outras não. Esta “atitude” tem a ver com as
características das suas moléculas: se têm carga eléctrica distribuída de forma
assimétrica, com certas zonas positivas e outras negativas (polaridade), a água
é para elas uma atracção. Se tal não acontece, as moléculas são apolares e nada
na água as atrai. E é isso que se passa com o azeite e a água; são constituídos
por moléculas com características diferentes, que não se ligam umas com as
outras. </span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Mas, se vez de água se usar
uma gema e um pouco de vinagre, produtos com bastante água (a gema tem cerca de
50% e o vinagre é quase só água), e mexermos energicamente a mistura, tudo se
resolve. Acabamos com um preparado macio e espesso. Tudo isto porque na gema
existem moléculas com duas zonas bem definidas: uma polar e outra apolar, ou
seja, uma que se liga facilmente à água (hidrofílica) e a outra ao azeite
(hidrofóbica), formando assim uma ponte entre substâncias imiscíveis, ou seja,
que não se misturam. Essas moléculas são um fosfolípido (a lecitina) e algumas proteínas
e dá-se-lhes o nome de emulsionantes e ao sistema obtido, uma emulsão. Para dar
estabilidade a esta ligação é necessário que as gotículas sejam muitas e muito
pequenas. Só assim elas, com o emulsionante a rodeá-las, ficam seguras e
imobilizadas. </span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0nd2BzahdZFY_lU2ENXsCcYlLNvi3N9JGue4sWzu-7Or6VvwF5LLSYZOetZltPexB8dDj0JitTUi5ukWrb1H0YgYJXAy6Lt8g1tPI6b5xBlCH6zjKygxF4PCpqyzzkFDLmbyRt8Nce0E/s1600/ill168+%255B640x480%255D.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="237" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0nd2BzahdZFY_lU2ENXsCcYlLNvi3N9JGue4sWzu-7Or6VvwF5LLSYZOetZltPexB8dDj0JitTUi5ukWrb1H0YgYJXAy6Lt8g1tPI6b5xBlCH6zjKygxF4PCpqyzzkFDLmbyRt8Nce0E/s400/ill168+%255B640x480%255D.png" width="400" /></a></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Ao aquecer a maionese no forno, e se esta tiver sido feita com as
proporções correctas, as proteínas do ovo vão ligar-se entre si e formar uma
rede, obtendo-se um gel que retêm a emulsão de gordura, ficando a maionese com
uma textura diferente e muito agradável.</span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">A batata e a maionese vão também ficar douradinhas, o que vai
originar um sabor e aroma muito agradáveis. Isso é o resultado de uma série de
reacções químicas complexas, as reacções de caramelização dos açúcares e as
reacções de Maillard, que a temperaturas elevadas se dão entre os açúcares e os
aminoácidos das proteínas da batata e maionese. Destas reacções resultam
moléculas que, além da cor, dão também um sabor agradável. </span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Não acha admirável como empiricamente se aprendeu a controlar
todos estes fenómenos e como as receitas tradicionais, passadas de geração em
geração, o demonstram?</span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">Estas receitas usam técnicas correctas e que podem ser explicadas
a nível molecular. Elas foram desenvolvidas por tentativa e erro, e as pessoas,
sem saberem nada das moléculas que compunham os alimentos, conseguiram chegar
aos melhores resultados. Foi assim também que a química evoluiu. Inicialmente
as descobertas eram feitas um pouco por acaso ou como resultado de um processo
empírico.</span></div>
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<span style="font-size: x-small;"><span style="color: black; font-family: "Century Gothic","sans-serif";">Se tiver curiosidade veja também estes posts mais antigos </span></span></div>
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<span style="font-size: x-small;"><span style="color: black; font-family: "Century Gothic","sans-serif";">sobre batatas:</span></span></div>
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<span style="font-size: x-small;"><span style="color: black; font-family: "Century Gothic","sans-serif";"><a href="http://umaquimicairresistivel.blogspot.pt/2011/09/batatas-farinhentas-e-cerosas.html">Batatas farinhentas e cerosas</a> </span></span></div>
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<a href="http://umaquimicairresistivel.blogspot.pt/2011/09/tecnicas-usadas-para-cozinhar-batatas-i.html"><span style="font-size: x-small;"><span style="color: black; font-family: "Century Gothic","sans-serif";">Técnicas usadas para cozinhar batatas I</span><span style="color: black; font-family: "Century Gothic","sans-serif";"></span><span style="color: black; font-family: "Century Gothic","sans-serif";"> </span></span></a></div>
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<a href="http://umaquimicairresistivel.blogspot.pt/2011/09/tecnicas-usadas-para-cozinhar-batatas.html"><span style="font-size: x-small;"><span style="color: black; font-family: "Century Gothic","sans-serif";">Técnicas usadas para cozinhar batatas II</span></span></a></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><a href="http://umaquimicairresistivel.blogspot.pt/2011/09/tecnicas-usadas-para-cozinhar-batatas_10.html"><span style="font-size: x-small;">Técnicas usadas para cozinhar batatas III</span></a></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="font-size: x-small;"><a href="http://umaquimicairresistivel.blogspot.pt/2011/01/batatas-esverdeadas.html">Batatas Esverdeadas</a></span></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="font-size: x-small;">sobre a gelatinização do amido:</span></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="font-size: x-small;"><a href="http://umaquimicairresistivel.blogspot.pt/2011/06/indigestibilidade-do-amido.html">A (in)degistibilidade do amido </a></span></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="font-size: x-small;">sobre a maionese:</span></span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="font-size: x-small;"><a href="http://umaquimicairresistivel.blogspot.pt/search?q=maionese">A "verdadeira" história da maionese a quatro vozes </a></span></span></div>
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Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-1407002877183443132015-06-03T12:30:00.000+01:002015-06-03T12:30:00.361+01:00Bacalhau à Zé do Pipo - II<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBPKX1nF9_4q9bbm0Dsm166QZrgzGsKoSFHYT-A4TUpwsVqDQ0nu8tTtfEVXZnEcdxeFd1yImG56v0jAfHs1sJ6CnxX56YeV0BKwNHFE7rGV-7WZW-_TN_VyFEVkwc7RcA3M-Ewh81B6U/s1600/cebolas.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="215" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBPKX1nF9_4q9bbm0Dsm166QZrgzGsKoSFHYT-A4TUpwsVqDQ0nu8tTtfEVXZnEcdxeFd1yImG56v0jAfHs1sJ6CnxX56YeV0BKwNHFE7rGV-7WZW-_TN_VyFEVkwc7RcA3M-Ewh81B6U/s400/cebolas.jpg" width="400" /></a></div>
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<div style="text-align: justify;">
<span style="font-family: "Century Gothic","sans-serif";">O Bacalhau à Zé do Pipo também leva cebola picada e frita. Os
vegetais têm, de um modo geral, menos aroma do que os frutos. Estes têm a
função de reprodução da planta e o aroma constitui um factor de atracção para
os pássaros e os insectos que irão espalhar as suas sementes. Já o aroma dos
vegetais só é evidenciado quando são cozinhados ou cortados. Exemplo deste
último caso são a cebola (<i style="mso-bidi-font-style: normal;">Allium cepa</i>)
e o alho (<i style="mso-bidi-font-style: normal;">Allium sativum</i>), que só
quando são cortados exibem um forte aroma pungente, que não constitui um factor
de sedução, bem pelo contrário, constitui uma protecção em relação a organismos
predadores.</span></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<span style="font-family: "Century Gothic","sans-serif";">Em ambos os casos o composto responsável pelo cheiro desagradável
é libertado pela acção duma enzima (um catalisador biológico) denominada
aliinase. A enzima e o composto sobre o qual actua (um derivado do aminoácido
cisteína) estão contidos nas células das cebolas e alhos, mas em compartimentos
separados. Quando os cortamos ou esmagamos, as células são danificadas e a
enzima e o referido composto entram em contacto, daí resultando a formação de
outros compostos de enxofre responsáveis pelo cheiro particular tão do nosso
conhecimento. E não só o cheiro... são também responsáveis pela choradeira
habitual de quem pica cebola.</span></div>
<span style="font-family: "Century Gothic","sans-serif";"> </span>
<br />
<div class="MsoBodyTextIndent2" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify; text-justify: inter-ideograph;">
<span style="font-family: "Arial","sans-serif"; font-size: 12.0pt; line-height: 125%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;"></span><span style="font-family: "Arial","sans-serif"; font-size: 12.0pt; line-height: 125%; mso-bidi-font-size: 11.0pt;"></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDjsqueaYGGEmX8snC9K56_gPP4gOGidGNyk30TetVKpKRimnTxFxYRBheryqTvf5iIp_UAAcib2D9FNYbBeuIY72WMeB6Lwy45qqeZrgKcjOTTIqn7cGxHzP4C0dXOgSvm4zLo0RyrzE/s1600/ill95+%255B640x480%255D.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="131" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDjsqueaYGGEmX8snC9K56_gPP4gOGidGNyk30TetVKpKRimnTxFxYRBheryqTvf5iIp_UAAcib2D9FNYbBeuIY72WMeB6Lwy45qqeZrgKcjOTTIqn7cGxHzP4C0dXOgSvm4zLo0RyrzE/s400/ill95+%255B640x480%255D.png" width="400" /></a></div>
<div class="MsoBodyTextIndent2" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify; text-justify: inter-ideograph;">
<span style="font-family: "Arial","sans-serif"; font-size: 12.0pt; line-height: 125%; mso-bidi-font-size: 11.0pt;"></span><span style="font-family: "Century Gothic","sans-serif";">Quando as cebolas são cozinhadas há alteração de alguns compostos
e formam-se outros novos, o sabor e aroma tornam-se adocicados e agradáveis e a
consistência aveludada. A cebola, por exemplo, contém uma quantidade
significativa de açúcares (cerca de 5%), principalmente glucose, e daí a
ocorrência de alguma caramelização que vai conferir agradáveis sabores ao
prato. A gordura, para além dum meio de condução de calor eficiente, permite
temperaturas elevadas, necessárias para que se formem alguns compostos que
introduzem novos sabores, e é um solvente de compostos lipossolúveis (solúveis
em lípidos, ou seja, em óleos e gorduras), potenciando assim o sabor. O azeite
usado na preparação do arroz introduz ainda novos e enriquecedores sabores no
prato final. </span></div>
<div class="MsoBodyTextIndent2" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify; text-justify: inter-ideograph;">
<br /></div>
<div class="MsoBodyTextIndent2" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify; text-justify: inter-ideograph;">
<span style="font-family: "Century Gothic","sans-serif";">(Continua...) </span>
</div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-71803406298441152432015-06-01T08:02:00.000+01:002015-06-01T08:02:00.137+01:00Bacalhau à Zé do Pipo - I<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpkqrbBE5jxjKVbkqOhwqDcEIxJr30Rhsuizhkwjg8qmjhzDN5Y5tHx4riuc3NgeEkWAlyTaj9xdK6N5epvFP709JdbD9dfWY6yoxAIVN4loj5u-Vqhk4leb592ZJpqv-Eb2rNvYOI8cE/s1600/rec0548-g.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="306" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpkqrbBE5jxjKVbkqOhwqDcEIxJr30Rhsuizhkwjg8qmjhzDN5Y5tHx4riuc3NgeEkWAlyTaj9xdK6N5epvFP709JdbD9dfWY6yoxAIVN4loj5u-Vqhk4leb592ZJpqv-Eb2rNvYOI8cE/s400/rec0548-g.jpg" width="400" /></a></div>
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<b><span style="font-family: "Century Gothic","sans-serif";">Bacalhau
à Zé do Pipo</span></b><span style="font-family: "Century Gothic","sans-serif";"></span></div>
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<span style="font-family: "Century Gothic","sans-serif";">1
lombo de bacalhau </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">2
cebolas médias </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">4
colheres de sopa de azeite </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">1
folha de louro </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">sal
e pimenta q.b. </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">1
tigela de maionese (feita com 2 gemas e 4 dl de azeite) </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">750
grs de batatas em puré </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">azeitonas
pretas </span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Depois
de bem demolhado, corte o bacalhau em postas. Leve-o a cozer.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Entretanto,
pique as cebolas e frite-as o azeite, com o louro, sal e pimenta. A cebola deve
ficar branca e macia e nunca loura.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Depois
de cozido, escorra o bacalhau e coloque-o num recipiente de barro ou, o que é
preferível, cada posta num recipiente de barro individual.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Deite
a cebola sobre as postas de bacalhau, que depois se cobrem completamente com a
maionese.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Contorne
com o puré de batata e leve a gratinar.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Enfeite
com azeitonas pretas. </span></div>
</div>
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<br /></div>
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<span style="font-family: "Century Gothic","sans-serif";">Se
calhar não lhe ocorre pensar em química ao ler esta receita, mas vai ver que não
é nada descabido meter a química ao barulho. <span style="mso-spacerun: yes;"> </span></span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Hoje
vamos falar do bacalhau, que tem mesmo muito que se lhe diga. </span><span style="font-family: "Century Gothic","sans-serif";">Desde civilizações muito
antigas que a salga é usada para conservar peixe e outros alimentos perecíveis.
Durante o processo de salga o peixe é colocado entre camadas de sal, começando
este por se dissolver na humidade da sua superfície. Cria-se então uma diferença
de concentração em sal dentro do peixe e no seu exterior, levando à saída de água
dos seus tecidos musculares de modo a equilibrar esta diferença, e o peixe vai
ficando seco e salgado. Este processo é no final reforçado pela secagem,
posterior à salga, que vai retirar ainda mais água, aumentando o teor em sal. </span></div>
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<br /></div>
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<span style="color: black;"></span><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtwTQB5vg1mTlPOfe7HbqjUjSO3CACuIF0Qe__knshcMucYussYVj_gh0fyC0t6iYAIU6m83W5uVjQy54FOClgBofdkMmx0q2VkAvHelVw9aaYFt-b57zrezUcVneKXabPYBtMZB-kZ0U/s1600/bacalhau+salgado.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="263" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtwTQB5vg1mTlPOfe7HbqjUjSO3CACuIF0Qe__knshcMucYussYVj_gh0fyC0t6iYAIU6m83W5uVjQy54FOClgBofdkMmx0q2VkAvHelVw9aaYFt-b57zrezUcVneKXabPYBtMZB-kZ0U/s400/bacalhau+salgado.jpg" width="400" /></a></div>
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<span style="font-family: "Century Gothic","sans-serif";"></span><span style="font-family: "Century Gothic","sans-serif";">Durante a salga, ocorrem alterações químicas das moléculas das
células: as proteínas do peixe, por exemplo, começam a coagular e o peixe perde
a sua opalescência. Inicialmente o peixe também desenvolve, através das suas
próprias enzimas e da sua flora microbiana, um sabor diferente e agradável.
Quando a concentração de sal aumenta muito, a actividade das enzimas das
células do peixe cessa, assim como a dos micróbios presentes, incluindo os
responsáveis pela degradação do peixe, que deixam de se poder desenvolver. E
isso vai aumentar a sua durabilidade.</span>
</div>
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<span style="font-family: "Century Gothic","sans-serif";">Um dos peixes mais usados em salga é, sem dúvida, o bacalhau. Um
dos motivos prende-se com o facto de ser pescado em mares longínquos e,
portanto, ter de fazer grandes viagens até chegar ao local de consumo. De
facto, como há uns bons anos não havia frigoríficos nos barcos, este era o
único processo de o conservar. Por outro lado, como o bacalhau tem um teor de
gordura muito baixo, é mais fácil uma boa conservação, pois não há o problema
da sua gordura ser oxidada pelo oxigénio do ar (rançificar), como acontece com
peixes mais gordos.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Quanto mais água usar para demolhar o bacalhau melhor. Em algumas
horas, o sal usado na conservação vai repartir-se pela água, através dum
processo inverso ao descrito para a salga. E o bacalhau seco fica reidratado.</span></div>
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<span style="font-family: "Century Gothic","sans-serif";">Ao cozer o bacalhau deve evitar que as proteínas que formam as
fibras do bacalhau se liguem muito fortemente entre si e rejeitem os sucos que
contêm, pois o bacalhau ficaria muito seco. Por outro lado o colagénio que as liga
também não deve passar todo para a água, pois é agradável comer o bacalhau com
as lascas envolvidas na sua “gelatina”. Para isso, a água deve apenas cobrir as
postas de bacalhau e deve-se levar a cabo uma fervura muito ligeira e durante
relativamente pouco tempo. Depende do seu gosto e da espessura das postas, uns
deixam fervilhar cerca de 10 minutos, outros apagam o lume logo que levanta fervura
e deixam depois o bacalhau dentro do caldo quente cerca de 20 minutos.</span></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";">(Continua...) </span></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-29060757147195539292015-05-28T09:36:00.000+01:002015-05-28T22:51:22.354+01:00O pimento e a sua interessante química<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBnwb4U_xeTAPz59xXNvvIfysMcz4F2j9djKZ7Kd__yjpT495kkNDZCrq9kYFXfubz6ohkqN-2R7F7hBmPaGZT91nG16he2v_eCnE77HptuwX2sggJTquzGAn-P5UcmHwV1XDb3fJdTdY/s1600/pimentos.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="243" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBnwb4U_xeTAPz59xXNvvIfysMcz4F2j9djKZ7Kd__yjpT495kkNDZCrq9kYFXfubz6ohkqN-2R7F7hBmPaGZT91nG16he2v_eCnE77HptuwX2sggJTquzGAn-P5UcmHwV1XDb3fJdTdY/s400/pimentos.jpg" width="400" /></a></div>
<br />
<div style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">Tal como acontece com outros frutos, os principais pigmentos visíveis num pimento imaturo são as clorofilas. Mas, apesar da clorofila ser fundamental para a fotossíntese, há outros pigmentos que contribuem para que a planta consiga obter mais energia da luz solar, nomeadamente os carotenóides - vermelhos, alaranjados e amarelos. Contudo estes não são visíveis, pois ficam "escondidos", pelas clorofilas.</span></span></div>
<div style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">À medida que o pimento amadurece, as clorofilas decompõem-se e surgem os carotenóides com as suas belas cores. Por exemplo o pimento passa de verde (imaturo) a vermelho (maduro). </span></span></div>
<div style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">Curiosamente os pimentos são das poucas plantas que são capazes de biosintetizar os pigmentos vermelhos que lhes dão cor - a capsantina e a capsorubina. Por isso estes até são chamados de "cetonas da paprica". </span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp8QxTEQYpmyBufS9_srSvshqKeFBs2PYCou4popl9GGt948BVNhmcYLIE40ZDzH7zpwxFcPNtNR93KTxqxWDDln5cDWaeWClbRTy2gdQp3C9IZ7_eMKYYQN4S8oda3juZoMvsIEzi8hM/s1600/capsosantina.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="235" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp8QxTEQYpmyBufS9_srSvshqKeFBs2PYCou4popl9GGt948BVNhmcYLIE40ZDzH7zpwxFcPNtNR93KTxqxWDDln5cDWaeWClbRTy2gdQp3C9IZ7_eMKYYQN4S8oda3juZoMvsIEzi8hM/s400/capsosantina.jpg" width="400" /></a></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">Também, curiosamente, o aroma tão familiar e característico do pimento verde deve-se a uma única substância </span></span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">2-metoxi-3-isobutil pirazina. O nariz humano consegue detectar este composto em solução aquosa em concentrações extremamente baixas, de 0.002
partes-por-trilião (i.e. 2:1,000,000,000,000). Isto significa que esta substância, também conhecida por pirazina do pimento, está entre as substâncias com o odor mais intenso conhecidas. </span></span></div>
<div style="text-align: justify;">
<br /></div>
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<span style="font-size: small;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp9SNJ_64qVUYnSOczpZLcykMtUi2RfUQD4yBi1UkNIlPlxPSIfJEAJVbbgjoNOy6t9CBUCgmiNQWHUkqDw3VoDGH9dF8f4QL_0U3lTwAcNHs7DGMLEMoXW6RiAfALsG8dsK3MvngKMuo/s1600/pimento+com+aroma.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp9SNJ_64qVUYnSOczpZLcykMtUi2RfUQD4yBi1UkNIlPlxPSIfJEAJVbbgjoNOy6t9CBUCgmiNQWHUkqDw3VoDGH9dF8f4QL_0U3lTwAcNHs7DGMLEMoXW6RiAfALsG8dsK3MvngKMuo/s400/pimento+com+aroma.jpg" width="353" /> </a></span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"></span></span><br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">Para saber mais veja <a href="http://www.chemistryviews.org/details/ezine/6108461/The_Biochemistry_of_Peppers.html">AQUI </a></span></span></div>
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">
</span></span>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-74829154368319365152015-05-25T09:19:00.000+01:002015-05-25T09:19:00.128+01:00Grão mais tenro... o bicarbonato de sódio ajuda!<!--[if !mso]>
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<![endif]--><span style="font-size: large;"><b><span style="line-height: 125%;">Hummus</span></b></span></span><br />
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<br /></div>
<div class="MsoNormal" style="line-height: 125%; margin-top: 6pt;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small; line-height: 125%;">250 g de grão cozido e escorrido</span></span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">sumo de 1 limão </span></span></div>
<div class="MsoNormal">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">1 dente de alho
grande, esmagado ou bem picado</span></span></div>
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">
</span></span><span style="font-size: small;">1 colher de
sopa de <i>tahini</i> (pasta de sésamo)<span style="line-height: 125%;">
</span></span></span><br />
<div class="MsoNormal">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">sal</span></span></span></div>
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">
</span></span></span>
<div class="MsoNormal">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">100 ml de
azeite </span></span></span></div>
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">
<div class="MsoNormal">
paprica ou
pimenta de caiena</div>
<div class="MsoNormal">
cominhos em pó</div>
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<br /></div>
</span></span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="line-height: 125%;"><div class="MsoNormal" style="margin-left: 3.4pt;">
<b> </b></div>
<div class="MsoNormal" style="margin-left: 3.4pt;">
<b>1- </b>Bata num copo misturador, ou com a varinha mágica, o grão
com o sumo de limão, o alho, o <i>tahini</i>, o sal e uma colher de sopa de
água Pode usar água da cozedura do grão) para formar uma pasta. </div>
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<br /></div>
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</span><span style="line-height: 125%;"><div class="MsoNormal" style="margin-left: 3.4pt;">
<b>2- </b>Vá juntando aos poucos o azeite e batendo até adquirir a
consistência que desejar (pode juntar um pouco mais ou menos). </div>
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<br /></div>
</span></span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="line-height: 125%;">
<div class="MsoNormal" style="margin-left: 3.4pt;">
<b>3- </b>Prove e junte um pouco mais de limão ou sal se desejar.
Se quiser pode temperar também com um pouco de tabasco.</div>
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<br /></div>
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<b>4- </b>Deite numa taça, polvilhe com um pouco de paprica ou
pimenta de caiena e um pouco de cominhos. Com uma colher deite também por cima
umas gotas de azeite. </div>
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<br /></div>
<div class="MsoNormal" style="margin-left: 3.4pt;">
<b>5- </b>Sirva com pão, bolachas ou legumes crus.</div>
</span></span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="line-height: 125%;">
</span></span><br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;"></span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: center; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNFMp71T_aCMXfKqswLljZ_gmjvFcSJqircJO4X7atwgvv_QV54euZl9wlPWIU0O6N9d5Y4jJjE9K3DrVhnvXyfQrB0AvPZ7gubxdQscIBJziGECZGWkH1G-7RyAzlsn8ABuDQuRgOWp4/s1600/Soaked-Chickpeas.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNFMp71T_aCMXfKqswLljZ_gmjvFcSJqircJO4X7atwgvv_QV54euZl9wlPWIU0O6N9d5Y4jJjE9K3DrVhnvXyfQrB0AvPZ7gubxdQscIBJziGECZGWkH1G-7RyAzlsn8ABuDQuRgOWp4/s320/Soaked-Chickpeas.jpg" width="320" /></a><span style="line-height: 125%;"> </span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: justify; unicode-bidi: embed; word-break: normal;">
<br /></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: justify; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">Pode usar grão enlatado, mas o seu <i>hummus</i>
ficará bem melhor se cozer grão seco. Muitas das receitas para cozer grão para <i>hummus</i> sugerem a adição de bicarbonato
de sódio à água onde se demolha o grão e, por vezes, até um pouco à água de
cozedura do grão. Dizem que os melhores cozinheiros do Médio Oriente o fazem. </span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: justify; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">Por
exemplo, para demolhar cada chávena de grão dissolvem 1 colher de chá de
bicarbonato de sódio em 1 litro de água. Deixam de molho 24h e lavam bem antes
de cozer. </span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: justify; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">Quanto à cozedura, para a quantidade de grão indicada nesta receita, usa-se por exemplo de ¼ a
½ colher de chá de bicarbonato.</span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: justify; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><span style="line-height: 125%;">O bicarbonato vai tornar a água em que se demolha ou coze o grão alcalina, nestas condições as </span></span></span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">
pectinas e hemiceluloses das paredes celulares são mais solúveis e
isso faz com que a textura do grão, e particularmente das suas cascas mude e estas ficam mais macias. De facto, a parede das células vegetais é constituída por longas e resistentes
microfibrilhas de celulose que se mantêm unidas por meio de uma matriz formada por glicoproteínas
(proteínas ligadas a açúcares), hemicelulose e pectina
(polissacarídeos), dissolvendo estes engfraquece-se a estrutura da parede celular. </span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0in; margin-top: 0pt; text-align: left; unicode-bidi: embed; word-break: normal;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzX519dmpD4CdhGuIBrmLBu-vSJxNO_5n7AnzIKMMUOQCXsO2z8UEE7x-m8i18vADZDXv3m9nUxEb2Hj3A5pFma7Dxtx2tn_nXk-UFFDVWmxMzJ6YsBY8IRU_AuFflqUIR_zQTPNIAR5c/s1600/parede_celular.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzX519dmpD4CdhGuIBrmLBu-vSJxNO_5n7AnzIKMMUOQCXsO2z8UEE7x-m8i18vADZDXv3m9nUxEb2Hj3A5pFma7Dxtx2tn_nXk-UFFDVWmxMzJ6YsBY8IRU_AuFflqUIR_zQTPNIAR5c/s1600/parede_celular.jpg" /></a></span></span></div>
<div style="text-align: center;">
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-size: small;">Imagem <a href="http://www.sobiologia.com.br/conteudos/Citologia/cito4.php">DAQUI</a>.</span></span></div>
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Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-71708367888962661212015-05-24T02:03:00.000+01:002015-05-24T02:03:04.085+01:00A Cor da Beterraba<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwtRk7bbye7Zj3YVTAaNQkvRLAZRNi-q3vgVWtaN6GHkAHuMfpoAbLERam-Fyqy7_IhNCU1T8peT2f7OklYU9E8z03IUv3KOUiw5QYoGA7grpAJ5DiE7rzcLUwuhzlzmtcDxYxxSWQ6rY/s1600/beetroot1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="294" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwtRk7bbye7Zj3YVTAaNQkvRLAZRNi-q3vgVWtaN6GHkAHuMfpoAbLERam-Fyqy7_IhNCU1T8peT2f7OklYU9E8z03IUv3KOUiw5QYoGA7grpAJ5DiE7rzcLUwuhzlzmtcDxYxxSWQ6rY/s320/beetroot1.jpg" width="320" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;">O pigmentos que dão a cor característica da beterraba, <i style="mso-bidi-font-style: normal;">Beta vulgaris</i>, pertencem a um grupo de
pigmentos denominados betalaínas. Estes pigmentos estão pouco presentes em
alimentos, sendo a beterraba uma excepção. Há várias betalaínas que contribuem
para a cor da beterraba, mas a mais representativa, por existir em maior quantidade,
é a betanina.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge6oFUxUVGxct4pv0t6WzS9QTddTnTgL10xNW1hDyn1SbubLHe2DWzji9yviYpkmk13kgknEQDKJEEvOovyAK8F_1LcyhJPI6p6gvhZBDoepg88f6M4vTpzA5tidgGc_DU9MYHw2ybl_A/s1600/Betanin.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="314" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge6oFUxUVGxct4pv0t6WzS9QTddTnTgL10xNW1hDyn1SbubLHe2DWzji9yviYpkmk13kgknEQDKJEEvOovyAK8F_1LcyhJPI6p6gvhZBDoepg88f6M4vTpzA5tidgGc_DU9MYHw2ybl_A/s320/Betanin.png" width="320" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">
</span><div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;">Este pigmento é bastante solúvel em água. Por isso deve
cozer-se a beterraba com casca, senão acaba por ficar um pouco descorada.</span></div>
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<br /></div>
<span style="font-family: "Trebuchet MS",sans-serif;">
</span><div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;">Também é possível extrair este pigmento da beterraba e usá-lo como
corante<span style="color: #0000ee;"><u> </u></span>alimentar. É comercializado com o nome vermelho de beterraba ou E162.</span></div>
<div class="separator" style="clear: both; text-align: center;">
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2fKGLbcTsCL5r6NZbrks7XkE9W3ljVvRPwZsw5FQ_PvtukwJAz3Nc_bHIdKHgtTplNEnOA12XpUvw5F6TaF5ds_5MEtT9gmj3hn6Ig1mxZsxjX4oJ1DKDtsLA_XD-69LiUSq3x75rumY/s1600/E162.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2fKGLbcTsCL5r6NZbrks7XkE9W3ljVvRPwZsw5FQ_PvtukwJAz3Nc_bHIdKHgtTplNEnOA12XpUvw5F6TaF5ds_5MEtT9gmj3hn6Ig1mxZsxjX4oJ1DKDtsLA_XD-69LiUSq3x75rumY/s1600/E162.jpg" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">No entanto é um corante um pouco instável, por
exemplo se for aquecido ao ar, e sobretudo em alimentos que não sejam ácidos, a
cor muda para acastanhado, por isso os bolos de beterraba não ficam vermelhos.</span></div>
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<br /></div>
<span style="font-family: "Trebuchet MS",sans-serif;">
</span><div class="MsoNormal" style="text-align: justify;">
<span style="font-family: "Trebuchet MS",sans-serif;">Não se assuste se depois de comer beterraba, a sua urina ou
as fezes ficarem cor-de-rosa. Significa apenas que o seu organismo não
metaboliza a betanina e esta atravessa o seu organismo sem ser alterada. O efeito é variável de pessoa para pessoa, nalgumas isto não acontece, noutras a cor pode ser muito visível e forte.</span></div>
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Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com6tag:blogger.com,1999:blog-7805647259887276455.post-79038765822780284192015-05-22T18:07:00.000+01:002015-05-22T18:07:00.208+01:00A canja e as suas moléculas<div class="separator" style="clear: both; text-align: center;">
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de galinha </span></b><b style="mso-bidi-font-weight: normal;"><span style="font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;"></span></b></div>
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<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">1 galinha com cerca de 1,5 Kg</span><span style="font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;"></span></div>
<div class="MsoNormal" style="border: none; line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: 0cm; margin-top: 6.0pt; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt; padding: 0cm; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">2 l de água</span><span style="font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;"></span></div>
<div class="MsoNormal" style="border: none; line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: 0cm; margin-top: 6.0pt; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt; padding: 0cm; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">100 gr de arroz</span></div>
<div class="MsoNormal" style="border: none; line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: 0cm; margin-top: 6.0pt; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt; padding: 0cm; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">sal</span><span style="font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;"></span></div>
<div class="MsoNormal" style="border: none; line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: 0cm; margin-top: 6.0pt; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt; padding: 0cm; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Numa panela coloque a água com o sal e a
galinha deixando aquecer lentamente e tirando a espuma que se for produzindo.</span></div>
<div class="MsoNormal" style="border: none; line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: 0cm; margin-top: 6.0pt; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt; padding: 0cm; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Estando cozida deite o arroz e deixe-o
cozer por mais vinte minutos, com a panela tapada.</span></div>
</div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Repare
bem que a galinha é posta em água fria. Porquê? Fará diferença se a colocar em
água quente? Há quem diga que sim, que o caldo fica mais saboroso se a puser em
água fria, pois dará tempo dos seus sucos passarem para o caldo, que é como
quem diz que se vão extrair mais moléculas. Mas para se comprovar, é importante
fazer experiências, e sobretudo experiências bem planeadas para que os
resultados tenham significado. </span></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Hervé
This fez a experiência, não com galinha, mas com carne, e as conclusões que
tirou foi que quando punha a carne em água a ferver a massa da carne diminuía
mais rapidamente do que num pedaço idêntico colocado em água fria (portanto inicialmente
até se estavam a extrair mais componentes da carne no caso da água quente). Mas,
ao fim de uma hora, os dois pedaços tinham a mesma massa. Em prova cega ninguém
conseguiu distinguir um caldo do outro. Embora para uma conclusão definitiva
fossem necessários estudos mais aprofundados, aparentemente obtêm-se resultados
idênticos. </span></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">O
que é importante é deixar cozinhar a galinha o tempo suficiente para que uma
grande quantidade das suas moléculas passe para o caldo e lhe dê sabor. Mas o
que vai acontecer é bem mais complexo, essas moléculas que passam para o caldo
vão decompor-se e reagir umas com as outras e vão dar moléculas diferentes que
enriquecem ainda mais o caldo.</span></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Além
disso, é ainda importante que o colagénio, que é o principal componente do
tecido conjuntivo, e tem o papel fundamental de dar firmeza à carne (músculo),
à pele e aos tendões, se altere e se dissolva na água, dando gelatina. E isto
leva tempo…</span></div>
<div class="" style="clear: both; text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiX4y92cqawYfikxHOXdTzatVNCKUSxlyQ7DqlQVa_XdSE1AbxJ7vbBvT7fak2NofOcJA4eF1zow_K7-58vtZCPzNog5xarHGQr_XT7HhrJBWt_TeejtmFPWqR5e_0Nc7-ZpdJRfDLb85w/s1600/gelatinaPT02+%5B640x480%5D.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiX4y92cqawYfikxHOXdTzatVNCKUSxlyQ7DqlQVa_XdSE1AbxJ7vbBvT7fak2NofOcJA4eF1zow_K7-58vtZCPzNog5xarHGQr_XT7HhrJBWt_TeejtmFPWqR5e_0Nc7-ZpdJRfDLb85w/s200/gelatinaPT02+%5B640x480%5D.png" width="165" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzw2ippkZlRE3FZZSW_Pqz2M5IaX7fkMqlvnl5hMgAlo_XXnVlQMZ-uNE_o3LwpQzCBQDt-cWkvq3ZREHdVdJ7I-KFkECbUb81DPUt3QrM4sp_vdKU0B5C6UbvY8KgDTT5BZHHUMbEntI/s1600/gelatinaPT01+%5B640x480%5D.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzw2ippkZlRE3FZZSW_Pqz2M5IaX7fkMqlvnl5hMgAlo_XXnVlQMZ-uNE_o3LwpQzCBQDt-cWkvq3ZREHdVdJ7I-KFkECbUb81DPUt3QrM4sp_vdKU0B5C6UbvY8KgDTT5BZHHUMbEntI/s200/gelatinaPT01+%5B640x480%5D.png" width="28" /></a><span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Vamos
perceber melhor o que se passa com o colagénio, vai ver que é interessante. O
colagénio é uma proteína constituída por três cadeias em hélice, enroladas umas
nas outras, formando como que uma corda. Quando
se aquece colagénio acima dos 70ºC, rompem-se as ligações entre as cadeias, a
hélice tripla desenrola-se – diz-se que o colagénio se desnatura – e as cadeias
acabam por se separar e por se dissolver na água, formando-se aquilo a que se
chama gelatina. </span>
</div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdd5ho-zGLwIbgjI12abrPH81_h_U6WCE9lQJykIO8uiTDHVLtF5nhbvY6ylMifveOt-7J0dBdXgZdzoynyGTW55ojCaUGsbvgyzhxMjyB7mKF81rhB_vEb5H3AYH1usXYhEZZtRIyVTo/s1600/gelatinaPT03+%5B640x480%5D.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdd5ho-zGLwIbgjI12abrPH81_h_U6WCE9lQJykIO8uiTDHVLtF5nhbvY6ylMifveOt-7J0dBdXgZdzoynyGTW55ojCaUGsbvgyzhxMjyB7mKF81rhB_vEb5H3AYH1usXYhEZZtRIyVTo/s200/gelatinaPT03+%5B640x480%5D.png" width="173" /></a><span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Certamente
que já guardou canja no frigorífico e deve ter reparado que ela se transformou
numa massa gelatinosa. Há pessoas que pensam que é gordura, mas são apenas
proteínas que ficam dissolvidas no caldo e que dão “corpo” à canja e nos
alimentam. Quando a canja arrefeceu, a gelatina “prendeu”, ou seja, formou-se
um gel. As cadeias proteicas depois de separadas não voltam a enrolar-se como
originalmente, mas nos seus movimentos (porque as moléculas nunca estão paradas
e quanto mais calor, maior a agitação…) as moléculas aproximam-se umas das
outras, e ligam-se entre si nalgumas zonas. À medida que a temperatura vai
baixando, vai-lhes faltando energia para quebrarem essas ligações e acabam por
formar uma rede tridimensional que retém a água – ou seja forma-se um gel.</span></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Vamos
agora ao arroz que adicionamos à canja. O arroz (<i style="mso-bidi-font-style: normal;">Oryza sativa</i>) é um cereal e as moléculas que o compõem são de
proteínas, lípidos (gorduras),<span style="mso-spacerun: yes;"> </span>sais
minerais e água, mas as que existem em maior quantidade são mesmo as dos
hidratos de carbono – cerca de 75%. Destes, grande parte é <a href="http://umaquimicairresistivel.blogspot.pt/2011/06/o-amido.html">amido</a>.
Para o nosso arroz, o ideal é mesmo o arroz carolino, dadas as <a href="http://umaquimicairresistivel.blogspot.pt/2011/03/o-amido-do-arroz.html">características do seu amido</a>. </span></div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Vamos
então ver o que acontece ao arroz quando o cozinhamos. Fundamentalmente vamos
torná-lo mais digerível (e mais saboroso, claro!). E ele fica mais digerível porque
alteramos a estrutura dos seus grânulos. Quando aquecemos, a energia introduzida
no sistema leva a que muitas das ligações químicas entre as moléculas de
amilose e de amilopectina se quebrem e que a água consiga introduzir-se nos
grânulos, fazendo-os aumentar de volume (inchar). Até parece que parte da água que
estava no tacho desapareceu. </span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgq7MGjqHlwRrfyoyzc2TcXpVit_TXpS-kBsQyC6hdchjfFddnZardyTOiy_iyUwoIYnH-zs_PV9QXc2ptwz1g_c3bTN19Z4sDi-f7f9qvmwEPERUH4xSZKPX1WG8cM49OMsKEZlTNOhYc/s1600/ill101+%5B640x480%5D.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="225" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgq7MGjqHlwRrfyoyzc2TcXpVit_TXpS-kBsQyC6hdchjfFddnZardyTOiy_iyUwoIYnH-zs_PV9QXc2ptwz1g_c3bTN19Z4sDi-f7f9qvmwEPERUH4xSZKPX1WG8cM49OMsKEZlTNOhYc/s320/ill101+%5B640x480%5D.png" width="320" /></a></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Continuando a aquecer conseguimos mesmo que alguns
grânulos </span><span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">rebentem
e larguem principalmente amilose para a água de cozedura. Para nós, tudo se
simplifica; as nossas enzimas têm dificuldade em actuar sobre um amido intacto
(amido nativo), mas já lhes é mais fácil vir a degradar o amido gelatinizado,
designação de um amido que foi sujeito à combinação de água e calor. </span></div>
<div class="MsoNormal" style="line-height: 125%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 0cm; margin-right: -2.85pt; margin-top: 6.0pt; text-align: justify;">
<span style="color: black; font-family: "Century Gothic","sans-serif"; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT;">Fascinante,
não é? Quem diria que tudo isto se passava na sua canja…</span></div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-24115384274013386742015-05-20T01:39:00.000+01:002015-05-20T01:39:00.232+01:00Qual a causa do cheiro característico do pão?<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeuPfhXypLD_Uacr0UVoUQaHZ-8mGM5VDYPcwCk6CCTSC9G30tj1EOQi0xoe8Oa6HhzYaisyEU05Z7v0CYJap54HKCkE9rYW83N3ruW6GCjmXvCLEBow9IfYM5i372KiOFhQMS1S7dyZ0/s1600/jornal+i1+(2).jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="158" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeuPfhXypLD_Uacr0UVoUQaHZ-8mGM5VDYPcwCk6CCTSC9G30tj1EOQi0xoe8Oa6HhzYaisyEU05Z7v0CYJap54HKCkE9rYW83N3ruW6GCjmXvCLEBow9IfYM5i372KiOFhQMS1S7dyZ0/s400/jornal+i1+(2).jpg" width="400" /></a></div>
<span style="font-size: x-small;">Publicado no Jornal I a 19/02/2015</span>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-76935814061808843872015-05-17T01:25:00.000+01:002015-05-17T01:25:07.653+01:00Barro Negro de Molelos<div class="sapomedia images" data-mce-style="text-align: center;" style="text-align: center;">
<a class="media-link" data-mce-href="http://fotos.sapo.pt/mpm5/fotos/?uid=esta7elerDlk5mf6GJfh" href="http://fotos.sapo.pt/mpm5/fotos/?uid=esta7elerDlk5mf6GJfh" title="Barro Negro2 (2).jpg"><img alt="Barro Negro2 (2).jpg" data-mce-src="http://2.fotos.web.sapo.io/i/Bf7069129/18418210_cZfwG.jpeg" data-mce-style="padding: 10px 10px;" height="264" src="http://2.fotos.web.sapo.io/i/Bf7069129/18418210_cZfwG.jpeg" style="padding: 10px;" title="Barro Negro2 (2).jpg" width="400" /></a></div>
Em Molelos (Tondela) são
produzidas loiças de barro negro desde tempos pré-históricos. Loiças
que têm sido usadas pelas populações locais para cozinhar,
conservar ou armazenar bebidas ou outros alimentos, e ainda como loiça
de mesa ou decorativa.<div class="sapomedia images" data-mce-style="text-align: center;" style="text-align: center;">
<br data-mce-bogus="1" /></div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
Depois
das peças serem moldadas na roda do oleiro, são secas lentamente ao ar e
cozidas. Tradicionalmente a cozedura era feita em Soenga, ou seja, numa
cova pouco profunda, actualmente é em fornos a lenha, mas sempre
reproduzindo as fases do processo tradicional.</div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
<br /></div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
O
facto das peças serem negras, resulta da forma como são cozidas e do
tipo de barro usado. Todos os oleiros que visitámos nos referiram a
importância da proveniência do barro. Por pesquisas posteriores que fiz, pensamos que tenha que ser um barro rico em ferro. Este produzirá um
barro vermelho ou castanho com uma cozedura numa atmosfera rica em
oxigénio. Contudo, nos barros de Molelos, na fase final da cozedura é
feita uma obstrução completa do forno para evitar a entrada de ar,
ficando a atmosfera muito deficiente em oxigénio. Neste ambiente
redutor, ocorre uma conversão de óxido férrico - Fe<sub>2</sub>O<sub>3</sub> – que é vermelho, em óxido ferroso - FeO – que é preto.</div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
<br /></div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
Antes
do forno ser selado, é ainda introduzida uma madeira resinosa no forno.
A combustão desta, no ambiente deficiente em oxigénio, vai produzir
finíssimas partículas de carbono. Sendo o barro poroso, este vai ficar
impregnando com estas partículas, contribuindo elas também para a cor.</div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
<br /></div>
<div class="sapomedia images" data-mce-style="text-align: center;" style="text-align: center;">
</div>
<div data-mce-style="text-align: justify;" style="text-align: justify;">
O
aspecto brilhante, um brilho quase metálico, resulta do facto das
peças, antes de serem introduzidas no forno, serem brunidas, ou seja
polidas com um seixo. Tal contribui também para uma certa
impermeabilização destas.</div>
Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-15706485391425127662015-05-17T01:14:00.002+01:002015-05-17T01:14:41.745+01:00A química das coisas deliciosas<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbwFZUTRDOOR288eEnRizQbqWFXLXZSvRhnur83RRAPWo_J2DHmblx9-uDUQ5_trSmiM5rvvr7EjYeULOc0J3ybHc4AMkI1y9lcODMeZHZdR-_Ks2gYWmR98Ffrg1qx62M_QbxdHzDJJI/s1600/work+(2).jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="72" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbwFZUTRDOOR288eEnRizQbqWFXLXZSvRhnur83RRAPWo_J2DHmblx9-uDUQ5_trSmiM5rvvr7EjYeULOc0J3ybHc4AMkI1y9lcODMeZHZdR-_Ks2gYWmR98Ffrg1qx62M_QbxdHzDJJI/s400/work+(2).jpg" width="400" /></a></div>
<h4>
</h4>
<span style="font-size: x-small;">Imagem <a href="http://questgarden.com/149/79/5/121022202046/conclusion.htm">DAQUI</a></span>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-46027593890863928252013-04-10T13:17:00.000+01:002013-04-10T13:17:00.479+01:00A Química dos Post-its<br />
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.youtube.com/embed/V1dJEzytfwI?feature=player_embedded' frameborder='0'></iframe></div>
<br />
O episódio de hoje mostra-nos com um fracasso na investigação em
química se pode tornar um sucesso e passar a fazer parte da nossa vida
quotidiana.<br />
Estão espalhados por todo o lado, colados nas portas, nos
computadores, nos frigoríficos e até nas pessoas, e deixaram de ser
apenas quadradinhos de papel amarelo para ganharem muitas formas e
muitas cores: são os “Post-it”®, os papelinhos que colam e descolam.<br />
A sua história começa em 1968 com uma empresa química que encorajava
os seus funcionários a utilizarem 15% do seu tempo de trabalho para
testarem ideias inovadoras. Um dos funcionários, um químico que
trabalhava com polímeros, tentou produzir uma cola mais forte do que as
existentes alterando as proporções na mistura de reagentes.<br />
O que obteve foi um novo polímero adesivo que se organizava em
pequenas esferas sobre uma superfície – em vez de a cobrir uniformemente
– e que estava longe de ser uma cola forte: colava, mas descolava com a
mesma facilidade! E voltava a colar… e a descolar!<br />
Era interessante, era diferente… e completamente inútil. Quem é que
quer colar a asa de uma caneca com uma cola que cola … e descola?<br />
A cola falhada ficou sem uma aplicação realmente útil durante anos,
até alguém sugerir o uso em marcadores de livros. Mas o sucesso não foi
imediato, porque ninguém estava disposto a pagar por um montinho de
papéis amarelo canário de utilidade duvidosa. A empresa decidiu então
distribuir o produto gratuitamente, porta a porta na cidade americana de
Richmond durante um ano. No ano seguinte já havia consumidores
viciados… como eu (e aposto) você!<br />
Hoje em dia são dos materiais de escritório mais vendidos no mundo. Um fracasso da química que veio facilitar o seu dia a dia!<br />
<br />
<a href="http://www.aquimicadascoisas.org/">Episódio da série A Química das Coisas</a>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com6tag:blogger.com,1999:blog-7805647259887276455.post-89572853329246538142013-03-29T12:41:00.001+00:002013-03-29T12:41:31.388+00:00Boa Páscoa<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp9-b-E8c_S0AP-ZIANuXp38h7Wb0oQDmkG7vTtiDWKmr5Ckn7G0HBoiaMDZcbv0QHZgFfm1ljkknwympcLBq0eUPQ3m27njL5oCjcbLBTJVOI5sJJx-9homtedfUUWDTf2WlCBvmGQ1A/s1600/Tabela+Periodica.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="371" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp9-b-E8c_S0AP-ZIANuXp38h7Wb0oQDmkG7vTtiDWKmr5Ckn7G0HBoiaMDZcbv0QHZgFfm1ljkknwympcLBq0eUPQ3m27njL5oCjcbLBTJVOI5sJJx-9homtedfUUWDTf2WlCBvmGQ1A/s400/Tabela+Periodica.jpg" width="400" /> </a></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-size: x-small;">(Um postal de Páscoa que nos enviaram. Desconhecemos a fonte original, mas é de tal forma delicioso, que não resistimos a usá-lo para vos desejar uma doce Páscoa.) </span></div>
<br />Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com3tag:blogger.com,1999:blog-7805647259887276455.post-89509877317979837012013-02-14T09:00:00.000+00:002015-03-14T01:19:03.580+00:00A Química do Amor<div class="separator" style="clear: both; text-align: center;">
<br /></div>
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<br />
Num programa que desvenda a química escondida no nosso dia a dia,
pode parecer-vos estranho falar de Amor, quase sempre celebrado como um
fenómeno espiritual, por vezes apenas físico, mas raramente visto como
resultado da ação de algumas substâncias químicas sobre o cérebro.<br />
Sem querer diminuir aos vossos olhos a força e beleza de tão nobre
sentimento, a verdade é que o “Amor” é um complexo fenómeno
neurobiológico, baseado em atividades cerebrais que incluem o desejo, a
confiança, o prazer e a recompensa e envolvem a ação de um número
elevado de mensageiros químicos.<br />
Quando duas pessoas estão apaixonadas, existe mesmo química entre
elas: os cientistas já encontraram muitas relações diretas entre os
compostos químicos que circulam no nosso sangue e atuam sobre o nosso
cérebro e os nossos comportamentos nas diversas fases do Amor.<br />
Numa primeira fase, o desejo sexual é despertado pela circulação das
hormonas sexuais, iniciada na adolescência: a testosterona nos homens e o
estrogénio nas mulheres.<br />
A segunda fase é a fase da paixão, quando perdemos o apetite, não
dormimos, e não pensamos senão na pessoa amada, pela ação de outro
conjunto de compostos químicos que atuam no nosso cérebro, os
neurotransmissores: a noradrenalina que acelera o bater do coração, a
serotonina que nos torna obcecados, e a dopamina, que nos faz sentir
felizes – e um pouco tolos – só com um sorriso ou olhar. Conseguem
reconhecer os sintomas?<br />
E porque ninguém consegue manter-se eternamente assim, passamos à
terceira fase do Amor, a fase de ligação, garantida pela presença de
duas hormonas que se libertam durante o ato sexual: a oxitocina – a
chamada a hormona do carinho – e a vasopressina, cuja presença é
aparentemente indispensável para garantir a fidelidade dos parceiros
sexuais.<br />
Estudos recentes dão também pistas sobre a forma de os homens
aumentarem o interesse das suas parceiras femininas. Mas isso é algo que
não vou revelar aqui…<br />
<div style="text-align: center;">
<br /></div>
<a href="http://www.aquimicadascoisas.org/">Episódio da série A Química das Coisas</a>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com2tag:blogger.com,1999:blog-7805647259887276455.post-900661263947114692013-01-16T08:30:00.000+00:002013-01-16T08:30:04.666+00:00A Química das Tatuagens<div class="separator" style="clear: both; text-align: center;">
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<br />
<br />
Há quem goste e quem deteste, mas poucos lhes ficam indiferentes. As
tatuagens são uma forma de afirmação individual e a sua popularidade tem
crescido recentemente.<br />
Conhecidas desde há mais de 5 mil anos, as tatuagens têm evoluído com
tempo e começam agora a dar um passo decisivo de mudança, graças ao
desenvolvimento da química: com as novas tintas removíveis, as tatuagens
perdem a sua característica mais marcante – vão deixar de ser um
compromisso para toda a vida.<br />
As tintas para tatuagem são normalmente obtidas por suspensão de um
corante num líquido apropriado: água, álcool, glicerina ou uma mistura
destes. Os corantes variam muito na sua composição e os mais usados são
relativamente inócuos. As tintas pretas são normalmente óxidos de
carbono, enquanto as azuis são obtidas com sais de cobre ou óxidos de
cobalto. O branco pode ser dióxido de titânio, óxido de zinco ou
carbonato de chumbo. Estes compostos são estáveis sob a pele e a
tatuagem é definitiva.<br />
As tintas removíveis têm uma filosofia completamente diferente: são
baseadas em corantes que podem ser absorvidos e degradados pelo
organismo. O corante absorvível é envolvido numa cápsula transparente
que garante a sua permanência na pele, enquanto o dono da tatuagem assim
o desejar. A cápsula protetora é feita de um material sensível à luz,
que se decompõe quando irradiado com um laser apropriado.<br />
Deste modo, quando o feliz proprietário desta tatuagem decide
removê-la, só tem de usar um laser adequado para degradar as cápsulas
protetoras, libertando assim, as moléculas de corante. Estas são depois
absorvidas e metabolizadas pelo organismo e em algumas horas a tatuagem
desaparece sem deixar qualquer marca!<br />
Um avanço importante para quem prefere o que é temporário e volúvel…<br />
<br />
<div style="text-align: center;">
<a href="http://www.aquimicadascoisas.org/">Episódio da série A Química das Coisas</a></div>Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-16143889778953232652012-12-28T09:00:00.000+00:002012-12-28T09:00:05.227+00:00Um Carro para um Químico <div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOevWlEexwjSHzg2H-daL5iGPg0gyc-jQuaDhb-9_wzFGC5a-xF6KhOqfvwq8m-gbMOquQ2WMQXLbVwtr6z5OFkmLUxqPUUPN5JoB9sYC5RKR6DDqg6Mzc5QjaS-k_jPEXs4YgQ30pL-8/s1600/carro+tp.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOevWlEexwjSHzg2H-daL5iGPg0gyc-jQuaDhb-9_wzFGC5a-xF6KhOqfvwq8m-gbMOquQ2WMQXLbVwtr6z5OFkmLUxqPUUPN5JoB9sYC5RKR6DDqg6Mzc5QjaS-k_jPEXs4YgQ30pL-8/s400/carro+tp.jpg" width="400" /></a></div>
<br />Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-31393149320422989112012-12-25T13:40:00.000+00:002012-12-25T13:40:00.201+00:00Bolo ReiHoje é dia de Natal e a sugestão do Roteiro "<a href="http://www.pavconhecimento.pt/roteiro4_sabores_cidade/pt/home.html">Em Lisboa, à Descoberta da Ciência e da Tecnologia</a>" do Pavilhão do Conhecimento - Ciência Viva, a última que lhe propomos, não podia deixar de ser o Bolo-Rei.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiH44_SWaNPAmW2VEFeDzBlLN_yhH9rYPaQ9Z0bOJASKcW5bXSziOTTnWGqnSJqBDC_DS4TZSx9s3fhgPrbe1GuCbo_9WASZFWt8Zuwg0TanQIgRHU2JdK01P48bLMLp3-E8rYFHXKKZc/s1600/08_bolorei_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="267" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiH44_SWaNPAmW2VEFeDzBlLN_yhH9rYPaQ9Z0bOJASKcW5bXSziOTTnWGqnSJqBDC_DS4TZSx9s3fhgPrbe1GuCbo_9WASZFWt8Zuwg0TanQIgRHU2JdK01P48bLMLp3-E8rYFHXKKZc/s400/08_bolorei_b.jpg" width="400" /></a></div>
O bolo rei nasceu na <span class="realcar">Confeitaria Nacional</span>,
sendo a sua receita secreta seguida rigorosamente desde meados do séc.
XIX. Foi inspirado no gâteau des rois, cuja receita, trazida de França
pelo filho do fundador, foi modificada por vários mestres confeiteiros.<br />
Sabia que em 1911, depois da proclamação da República, houve
uma proposta em sessão parlamentar para alterar o seu nome para bolo
república?<br />
A massa do bolo rei é levedada por ação de um fermento que é um
micróbio vivo - a levedura Saccharomyces cerevisae - identificada e
estudada por Pasteur no séc. XIX. Num processo chamado fermentação, que
ocorre na ausência de oxigénio, a levedura alimenta-se dos açúcares
existentes na massa do bolo e produz o gás dióxido de carbono,
responsável pela sua leve textura, etanol e muitas outras substâncias
que conferem ao bolo um sabor e aroma de fazer crescer água na boca.Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0tag:blogger.com,1999:blog-7805647259887276455.post-52344734293677647842012-12-25T05:00:00.000+00:002012-12-25T05:00:06.124+00:00Tenham um Óptimo Natal<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMRfAf2Jcz_LhsjcMds6db9vCAbN9GJ9r3WhrlugKFgJ-FFVtcmBoHZ3A4tah5Cnvd9ut8cwj2Q0KJ4Te4RviL19u8BA9t8vY0LiEj0RyIHw5sC5XHXlkeIgYzItNOmFdF7MgYS-h6XKs/s1600/natal+12.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMRfAf2Jcz_LhsjcMds6db9vCAbN9GJ9r3WhrlugKFgJ-FFVtcmBoHZ3A4tah5Cnvd9ut8cwj2Q0KJ4Te4RviL19u8BA9t8vY0LiEj0RyIHw5sC5XHXlkeIgYzItNOmFdF7MgYS-h6XKs/s640/natal+12.jpg" width="417" /></a></div>
<br />Uma Química Irresistível!http://www.blogger.com/profile/08040577645016662487noreply@blogger.com0