期刊
JOURNAL OF MEMBRANE BIOLOGY
卷 230, 期 1, 页码 11-19出版社
SPRINGER
DOI: 10.1007/s00232-009-9181-5
关键词
Sphingomyelin; Interfacial tension; Effect of pH on interfacial tension; Adsorption equilibrium
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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