Acid–base equilibria at interface separating electrolyte solution and lipid bilayer formed from phosphatidylcholine Original Research Article

The dependence of the interfacial tension of a lipid membrane formed from phosphatidylcholine on the pH of the aqueous solution has been studied. The model describing the H+ and OH− ions adsorption in the bilayer lipid surface has been presented in this work. We take suitable equations to describe the dependence of interfacial tension of a lipid bilayer membrane on H+ and OH− ion concentrations. A theoretical equation is derived to describe this dependence in the whole pH range.