Sites of adsorption of adenine, uracil, and their corresponding derivatives on sodium montmorillonite
Por:
Perezgasga L., Serrato-Díaz A., Negrón-Mendoza A., De Pablo Galán L., Mosqueira F.G.
Publicada:
1 ene 2005
Resumen:
Clay minerals are considered important to chemical evolution processes due to their properties, ancient origin, and wide distribution. To extend the knowledge of their role in the prebiotic epoch, the adsorption sites of adenine, adenosine, AMP, ADP, ATP, Poly A, uracil, uridine, UMP, UDP, UTP and Poly U on sodium montmorillonite are investigated. X-ray diffraction, ultraviolet and infrared spectroscopy studies indicate that these molecules distribute into the interlamellar channel and the edge of the clay crystals. Monomers are adsorbed predominantly in the interlamellar channel, whereas polymers adsorb along the crystal edges. Such behavior is discussed mainly in terms of bulk pH, pK a of the adsorbate, and Van der Waals interactions. © Springer 2005.
Filiaciones:
Perezgasga L.:
Instituto de Ciencias Nucleares, UNAM. Cd. Universitaria, México D.F., Mexico
Depto. de Fisiología Y Genética Molecular, Instituto de Biotecnología, UNAM, Av. Chamilpa #2001, Cuernavaca, Mor. 62271, Mexico
Serrato-Díaz A.:
Instituto de Ciencias Nucleares, UNAM. Cd. Universitaria, México D.F., Mexico
Negrón-Mendoza A.:
Instituto de Ciencias Nucleares, UNAM. Cd. Universitaria, México D.F., Mexico
De Pablo Galán L.:
Instituto de Geología, UNAM. Cd. Universitaria, México D.F., Mexico
Mosqueira F.G.:
Dirección General de Divulgación de la Ciencia, UNAM, A. Postal 70-487, 04510 México D.F., Mexico
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