Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005oleb...35...91p&link_type=abstract
Origins of Life and Evolution of Biospheres, Volume 35, Issue 2, pp.91-110
Physics
6
Adenine, Channel Adsorption, Clays, Edges Adsorption, Interlamellar Channel, Ionic Exchange, Sodium Montmorillonite, Uracil
Scientific paper
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.
Gal'N de Pablo L.
Mosqueira F. G.
Negron-Mendoza Alicia
Perezgasga L.
Serrato-Díaz A.
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