tag:blogger.com,1999:blog-60306056975443898402024-02-19T08:50:39.218-08:00Los carbohidratos...Aquí podrás encontrar la información precisa, necesaria y de fácil comprensión para la primera unidad en la cátedra de bioquímica.Nataly Riverohttp://www.blogger.com/profile/10979116729395717374noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6030605697544389840.post-90959379675731747362010-02-28T18:08:00.000-08:002010-02-28T21:10:43.627-08:00<div style="border-bottom: medium none; border-left: medium none; border-right: medium none; border-top: medium none; text-align: center;">
<strong><span style="color: orange; font-family: Arial, Helvetica, sans-serif; font-size: x-large;">¿Que son carbohidratos?</span></strong></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">son sustancias naturales compuestas en su mayoría por carbono hidrogeno y oxígeno con funciones estructurales y energéticas. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Son polihidroxi aldehídos o cetonas o compuestos que conducen a ellos por hidrólisis y sus derivados. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Son las moléculas más abundantes de la Tierra. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Se denominan Hidratos de carbono por responder muchos de ellos a la formula general:</span></div>
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<strong><span style="font-size: large;"><span style="color: blue;"><span style="font-family: Arial, Helvetica, sans-serif;">(CH<span style="font-size: x-small;">2</span>O)<span style="font-size: x-small;">n</span></span></span></span></strong></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Son moléculas reducidas parcialmente, las cuales producen, por oxidación, la energía necesaria para conducir los procesos metabólicos, de esta forma los carbohidratos pueden actuar como moléculas para el almacenamiento de la energía.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Los carbohidratos poliméricos se encuentran en paredes celulares y recubrimientos protectores de muchos organismos.</span></div>
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</font><span style="color: orange; font-family: Arial, Helvetica, sans-serif; font-size: x-large;"><strong>Se clasifican en:</strong></span></div>
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<span style="color: orange; font-family: Arial, Helvetica, sans-serif; font-size: x-large;"><strong>Monosacáridos</strong></span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Llamados azucares simples</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Formula empírica (CH2ON)n </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Todos los átomos de carbono presentan un grupo hidroxilo excepto uno.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Oxigeno carbonílico, que forma un enlace cetal o acetal</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Sufijo osa →</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Los mas sencillos son las triosas</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Se encuentran: tetrosas, pentosas, hexosas heptosas y octosas.</span></div>
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<span style="color: #b45f06; font-family: Arial, Helvetica, sans-serif; font-size: large;">Aldosas --- Cetosas</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Y por el número de carbonos en la estructura los monosacáridos se dividen en:</span></div>
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<span style="color: #b45f06; font-size: large;"><span style="font-family: Arial, Helvetica, sans-serif;">Triosas <span style="color: black; font-size: small;">Cadena de tres Carbonos, Fórmula C3H6O3</span></span></span></div>
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<span style="color: #b45f06; font-family: Arial, Helvetica, sans-serif; font-size: large;">Tetrosas <span style="color: black; font-size: small;">Cadena de Cuatro Carbonos, Fórmula C4H6O3 </span></span></div>
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<span style="color: #b45f06; font-size: large;">Pentosas</span> <span style="color: black; font-size: small;">Cadena de cinco Carbonos, Fórmula C5H6O3 </span><br />
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<span style="color: #b45f06; font-size: large;">Hexosas <span style="color: black; font-size: small;">Cadena de seis Carbonos, Fórmula C6H6O3 </span></span></div>
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<span style="color: #b45f06; font-size: large;">Estructuras lineal y cíclicas de los monosacáridos</span></div>
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<span style="color: orange; font-size: x-large;"><strong>Oligosacáridos</strong></span></div>
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<span style="color: black; font-size: small;">Los oligosacáridos contienen entre dos (2) y diez (10) unidades monoméricas, formados por enlaces glucosídicos otros tipos de compuestos que contengan hidroxilo.</span> </div>
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<span style="color: #b45f06; font-size: large;"><strong>Disacáridos:</strong></span> <span style="color: black; font-size: small;">Se constituye por dos monosacáridos unidos a un enlace glucosídico. </span></div>
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<span style="color: black; font-size: small;">Desempeñan múltiples funciones en los organismos vivos, sea constituyendo reservas de energía soluble en plantas o componentes de sustancias mas complejas en la naturaleza.</span></div>
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<span style="font-size: x-large;"></span><span style="color: #b45f06; font-size: large;">Algunos disacáridos son:</span> <br />
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<span style="color: #bf9000;"><span style="font-size: large;">Maltosa </span><span style="color: black; font-size: small;">Se forma como producto intermedio en la acción de la amilasa sobre el almidón.</span></span><br />
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<span style="color: #bf9000; font-size: large;">Sacarosa</span> <span style="color: black; font-size: small;">Conocido como azúcar común, o azúcar de caña esta formado por los monosacáridos glucosa y fructosa. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;"><span style="color: #b45f06; font-size: large;"><strong>Tri sacáridos:</strong></span> </span><span style="font-family: Arial, Helvetica, sans-serif;">Son la combinación de tres residuos de monosacáridos unidos a través de dos enlaces glucosídicos. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">El mas común es la rafinosa presente en la remolacha, formada por galactosa y sucrosa (esta molécula es indigestible por los seres humanos, y se fermenta en el intestino grueso por bacterias que producen gas.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;"><span style="color: orange; font-size: x-large;"><strong>Polisacáridos</strong></span></span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Los polisacáridos realizan una amplia gama de funciones en los organismos vivos. Algunos de ellos como el almidón se emplean como azucares de reservasen las plantas y los animales, y otros como la celulosa y la quitina son sustancias estructurales análogas las proteínas estructurales.</span><br />
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<span style="color: orange; font-family: Arial, Helvetica, sans-serif; font-size: x-large;"><strong>Propiedades físicas de los carbohidratos</strong></span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Los carbohidratos se caracterizan a nivel físico o visual por:</span> <br />
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<span style="font-family: Arial, Helvetica, sans-serif;">Ser generalmente blancos o cristalinos</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Hidrosolubles y dulces (especialmente los monosacáridos)</span></div>
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<span style="color: orange; font-family: Arial, Helvetica, sans-serif; font-size: x-large;"><strong>Las principales funciones biológicas de los carbohidratos se basan en:</strong></span> </div>
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<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: large;">Su función almacenadota, ya que al oxidarse en la combustión liberan energía.</span></li>
<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: large;">El aporte de átomos de carbono para otros componentes celulares.</span></li>
<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: large;">Son elementos estructurales de la células, los tejidos y las paredes o cubiertas bacterianas.</span></li>
<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: large;">Componentes de antibióticos.</span></li>
<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: large;">Participan en la cicatrización vegetal (goma arábiga)</span></li>
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Nataly Riverohttp://www.blogger.com/profile/10979116729395717374noreply@blogger.com