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    The Equilibria in Lipid-Lipoic Acid Systems: Monolayers, Microelectrophoretic and Interfacial Tension Studies

    Year: 2020

    Journal: Molecules, Volume 25, AUG

    Authors: Laszuk, P; Urbaniak, W; Petelska, AD

    Organizations: European Funds for Regional DevelopmentEuropean Commission; National Funds of the Ministry of Science and Higher Education, Operational Program Development of Eastern Poland [POPW.01.03.00-20-044/11]

    Keywords: lipid; lipoic acid; monolayer; liposomes; spherical bilayer; Langmuir trough; interfacial tension; microelectrophoresis; complex formation equilibria

    In this examination, we investigated the effect of lipoic acid (LA) on the properties of biological membrane models (monolayers, bilayers, and liposomes) formed from phosphatidylcholine (PC) or phosphatidylserine (PS) using the Langmuir, microelectrophoresis, and interfacial tension methods. The Langmuir technique allowed us to calculate the pi-A isotherms and determine the molecular surface areas of pure and mixed monolayers. Using mathematical equations, we established that LA and the lipids formed complexes at a 1:1 ratio. The interfacial tension method was based on Young and Laplace's equation. We assumed the formation of a 1:1 complex in the PC-LA system. Using the mathematical relationships, we derived the parameters characterizing the resulting complex, i.e., the surface occupied by the complex and the interfacial tension and stability constant of the formed complex. The microelectrophoretic method was used to determine the dependence of the zeta potential of the lipid membranes as a function of the pH (pH 2 to 10) of the electrolyte solution. The results indicate that modification of PC or PS membranes with LA affects changes in the zeta potential and the isoelectric point values.
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