Sites of Adsorption of Adenine,Uracil, and Their Corresponding Derivatives on Sodium Montmorillonite |
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Authors: | L?Perezgasga A?Serrato-DíAz A?NegróN-Mendoza L?De?Pablo?Gal’N Email author" target="_blank">F?G?MosqueiraEmail author |
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Institution: | (1) Instituto de Ciencias Nucleares, UNAM. Cd. Universitaria, México D.F., México;(2) Instituto de Geología, UNAM. Cd. Universitaria, México D.F., México;(3) Direccitionn General de Divulgación de UNAM, A. Postal 70-487, México D.F., México, Del. Coyoac n, 04510;(4) Present address: Depto. de Fisiología y Genética Molecular Instituto de Biotecnología, UNAM. Av. Chamilpa #2001 A.P.510-3, Cuernavaca, Mor., 62271 México |
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Abstract: | 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, pKa of the adsorbate, and Van der Waals interactions. |
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Keywords: | adenine channel adsorption clays edges adsorption interlamellar channel ionic exchange sodium montmorillonite uracil |
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