期刊
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES
卷 35, 期 2, 页码 91-110出版社
SPRINGER
DOI: 10.1007/s11084-005-0199-0
关键词
adenine; channel adsorption; clays; edges adsorption; interlamellar channel; ionic exchange; sodium montmorillonite; uracil
类别
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.
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