pH Effect of the Sphingomyelin Membrane Interfacial Tension |
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Authors: | Aneta Dorota Petelska Zbigniew Artur Figaszewski |
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Affiliation: | (1) Institute of Chemistry, University of Bialystok, Al. Pilsudskiego 11/4, 15-443, Bialystok, Poland;(2) Laboratory of Electrochemical Power Sources, Faculty of Chemistry, University of Warsaw, Pasteur St. 1, 02-093, Warsaw, Poland |
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Abstract: | The effect of pH on the interfacial tension of a sphingomyelin membrane in aqueous solution has been studied. Three models describing H+ and OH− ion adsorption on the bilayer lipid surface are presented. In models I and II, the membrane surface is continuous, with uniformly distributed functional groups as centers of H+ and OH− ion adsorption. In model III, the membrane surface is composed of lipid molecules, with and without adsorbed H+ and OH− ions. The contribution of each individual lipid molecule to the overall interfacial tension of the bilayer was assumed to be additive in models I and II. In model III, the Gibbs isotherm was used to describe adsorption of H+ and OH− ions at the bilayer surface. Theoretical equations are derived to describe the interfacial tension as a function of pH for all three models. Maximum interfacial tension was observed experimentally at the isoelectric point. |
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Keywords: | Sphingomyelin Interfacial tension Effect of pH on interfacial tension Adsorption equilibrium |
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