Rojo sangre, verde hierba

24 02 2009

pirrol_porfina2c.gif

El pirrol (izquierda) es un  heterociclo de cinco átomos, uno de los cuales es nitrógeno. Si unimos cuatro anillos de pirrol, tal y como se ve a la derecha de la figura, obtenemos una molécula llamada porfina. Las porfirinas son complejos con iones metálicos fuertemente coloreados. Si el átomo metálico es el hierro, la porfirina resultante recibe el nombre de heme que es el compuesto responsable del intenso color rojo de la sangre:

heme.gif

El átomo de hierro central aún posee otros dos posibilidades de unión. Así la proteína globina se une al átomo de hierro por encima del plano del anillo formando el complejo llamado hemoglobina. El otro punto de unión, situado por debajo del plano del anillo, es usado para fijar moléculas de oxígeno que son transportadas de esta manera a todo el organismo.

La clorofila, responsable del color verde de las plantas, también es una porfirina, ligeramente modificada, con un átomo de magnesio situado en el centro del anillo.

clorofila2.gif

La clorofila permite a las plantas obtener energía del sol. Esta energía será utilizada en la fotosíntesis para obtener carbohidratos a partir del CO2 del aire y el H2O absorbida por las raices.

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36 Comentarios a “Rojo sangre, verde hierba”

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Me ha gustado mucho esta entrada, buen ejemplo de como el mundo se construye a base de pequeñas piezas insertadas, empezando en los quarks y acabando…¡no soy capaz de decir en qué nivel!; interesante y sencillo.

21 06 2009
Benjamin (18:00:15) :

Me parece excelente las ilustraciones del pirrol y la porfirina, es fácil de entender y las explicaciones son muy entendibles, sigan así!!

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Anónimo (19:10:59) :

Excelente publicación, en especial, por la brevedad, simplicidad y la buena ilustración del tópico.

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La clorofila, responsable del color verde de las plantas, también es una porfirina, ligeramente modificada, con un átomo de magnesio situado en el centro del anillo

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