Phospholipid monolayers studied by a combination of cyclic voltammetry andLangmuir techniques at the water vertical bar 1,2-dichloroethane interface

Monolayers of distearoyl phosphatidylcholine spread on the water \ 1,2-dich loroethane interface have been studied in a novel type of Langmuir trough. Isotherms of the lipid have been measured at controlled potential differenc es across the interface, and cyclic voltammetry has been applied at a contr olled surface pressure. Electrocapillary curves derived from the isotherms agree with the ones measured at true thermodynamic equilibrium. At positive potentials the adsorption of the lipid appeared to be weak while at negati ve potentials rather stable monolayers were obtained. (C) 1999 Elsevier Sci ence S.A. All rights reserved.