Cation binding to membranes: Competition between mono-, di- and trivalent cations |
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Authors: | Joe Bentz Shlomo Nir |
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Affiliation: | (1) Department of Experimental Pathology, Roswell Park Memorial Institute, 666 Elm Street, 14263 Buffalo, New York;(2) Department of Biophysical Sciences, State University of New York, 14226 Buffalo, New York, USA |
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Abstract: | The binding of mono-, di- and trivalent cations to negatively charged surfaces is studied within the framework of a modified Gouy-Chapman equation. For any given combination of ions of the above valences, the existence and uniqueness of the solution for the surface potential is shown. The treatment provides the surface potential and charge density. For a system containing only monovalent and divalent ions, analytical solutions are given. When trivalent ions are also present, a procedure based on numerical integration is described. The distance dependence of the electrostatic potential for planar surfaces is given. The calculations provide the amount of cations tightly bound and the amount trapped in the double layer region. The competition between cations for binding to surfaces is elucidated. |
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