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Adsorption of adenine, cytosine, uracil, ribose, and phosphate by Mg-exchanged montmorillonite

Published online by Cambridge University Press:  09 July 2018

H. Hashizume ,
S. van der Gaast  and
B. K. G. Theng
H. Hashizume*
Affiliation:
National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
S. van der Gaast
Affiliation:
Hugo de Grootstraat 37, 2311XK Leiden, The Netherlands
B. K. G. Theng
Affiliation:
Landcare Research, Private Bag 11-052, Palmerston North 4442, New Zealand
*
*E-mail: [email protected]
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Abstract

We have determined the adsorption of RNA components (adenine, cytosine, uracil, ribose and phosphate) by Mg2+-exchanged montmorillonite. The isotherms for adenine, cytosine and uracil were of the C-type, the amount adsorbed increasing linearly with the equilibrium solute concentration. All three nucleic acid bases were apparently adsorbed by coordination to Mg2+ ions through a water bridge. Very little ribose was adsorbed by Mg-exchanged montmorillonite. The isotherm for phosphate was of the L-type. The plateau value of about 0.012 mmol g–1 indicated that phosphate adsorbed on the edge surface of montmorillonite. At comparable solute concentrations, adsorption decreased in the order adenine > cytosine > uracil. This observation reflects differences in basicity, size, and aqueous solubility among the three compounds.

Keywords

Mg-exchanged montmorilloniteadsorptionnucleic acid basesriboseadeninecytosinephosphate
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 4 , December 2010 , pp. 469 - 475
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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