Study of ion transfer across phospholipid monolayers adsorbed at micropipette ITIES

Anna Kaisa Kontturi, Kyösti Kontturi, Lasse Murtomäki, Bernadette Quinn, Vincent J. Cunnane

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    38 Citations (Scopus)

    Abstract

    The transfer of tetraethylammonium cations across phospholipid monolayers deposited at a micropipette ITIES (interface between two immiscible electrolyte solutions) was studied using short potential step techniques. The observed current transients consisted of a capacitive and a faradaic current component, which were separated using a non-linear fit to a model function. Fits were very good. From the capacitive component, the surface coverage of lipids was calculated by applying a simple model for the monolayer configuration. It appeared that the coverage varied between 80 and 99%. The rate of ion transfer was increased slightly after the lipid addition, but no significant variations between different lipids were found. The transfer mechanism is discussed briefly.

    Original languageEnglish
    Pages (from-to)69-74
    Number of pages6
    JournalJournal of Electroanalytical Chemistry
    Volume424
    Issue number1-2
    DOIs
    Publication statusPublished - 15 Mar 1997

    Keywords

    • ITIES
    • Micropipette
    • Phospholipid
    • Short potential step

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