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    Electrochemical Study of Ion Transfer of Acetylcholine Across the Interface of Water and a Lipid-Modified 1,2-Dichloroethane

    Year: 2005

    Journal: J. Phys. Chem. B 2005, 109, 12549-12559, 20111221

    Authors: Rubin Gulaboski, Carlos M. Pereira, M. Natalia D. S. Cordeiro, Ivan Bogeski, Elisabete Ferreira, David Ribeiro, Mariana Chirea, and A. Fernando Silva

    Organizations: Departamento de Quimica, Faculdade de Ciencias, Universidade do Porto, 4169-007 Porto, Portugal

    The ion transfer of acetylcholine (AcH+) ions across the unmodified and phospholipid-modified water|1,2-dichloroethane (DCE) interface has been studied by means of square-wave and cyclic voltammetry, as well as by electrochemical impedance spectroscopy. After being transferred in the organic phase, the AcH+ ions undergo chemical reactions with the phospholipids. The overall behavior of the experimental system studied in the presence of phospholipids has been compared with the theoretical results of an ECrev reaction. The kinetic parameters of the chemical interactions between AcH+ and the phospholipids have been determined from the voltammetric and impedance measurements. Additional characterization of those interactions has been made by using the surface tension measurements.