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Domains And Anomalous Adsorption Isotherms Of Dipalmitoylphosphatidylcholine Membranes And Lipophilic Ions: Pentachlorophenolate, Tetraphenylborate, And Dipicrylamine, Pavel Smejtek, S. Wang
Domains And Anomalous Adsorption Isotherms Of Dipalmitoylphosphatidylcholine Membranes And Lipophilic Ions: Pentachlorophenolate, Tetraphenylborate, And Dipicrylamine, Pavel Smejtek, S. Wang
Physics Faculty Publications and Presentations
Dipalmitoylphosphatidylcholine (DPPC) vesicles acquire negative surface charge on adsorption of negatively charged pentachlorophenolate (PCP-), and lipophilic ions tetraphenylborate (TPhB-), and dipicrylamine (DPA-). We have obtained (a) zeta-potential isotherms from the measurements of electrophoretic mobility of DPPC vesicles as a function of concentration of the adsorbing ions at different temperatures (25–42 degrees C), and (b) studied the effect of PCP- on gel-to-fluid phase transition by measuring the temperature dependence of zeta-potential at different PCP- concentrations. The zeta-potential isotherms of PCP- at 25, 32, and 34 degrees C correspond to adsorption to membrane in its gel phase. At 42 degrees C the …