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Non-electrolyte permeability as a tool for studying membrane fluidity.

E J Van Zoelen, C Henriques de Jesus, E de Jonge

    Biochimica Et Biophysica Acta
    |August 17, 1978
    PubMed
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    Membrane fluidity impacts thiourea permeation through lipid bilayers. Lipid composition and packing determine solute-water interactions and membrane fluidity indices.

    Area of Science:

    • Biophysics
    • Membrane Biophysics
    • Physical Chemistry

    Background:

    • Phosphatidylcholine bilayers are fundamental to cell membranes.
    • Understanding solute and water transport is crucial for membrane function.
    • Lipid composition significantly influences membrane properties.

    Purpose of the Study:

    • To quantify the reflection coefficient of thiourea permeation across phosphatidylcholine bilayers.
    • To develop a membrane fluidity index based on lipid fatty-acid composition.
    • To characterize the fluidity of cholesterol-containing and gel-state lipid membranes.

    Main Methods:

    • Measurement of reflection coefficients for thiourea permeation.
    • Relating reflection coefficients to lipid fatty-acid composition.

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  • Utilizing solute-solvent interaction parameters to assess membrane fluidity.

    • Main Results:

    • Reflection coefficient for thiourea is dependent on phosphatidylcholine fatty-acid composition.
    • A relative membrane fluidity index was established for various lipids.
    • The maximum number of water molecules co-permeating with solute varies with lipid packing.

    Conclusions:

    • Lipid fatty-acid composition is a key determinant of membrane transport properties.
    • The developed fluidity index provides a quantitative measure for comparing different lipids.
    • Solute-solvent interactions offer insights into the fluidity of complex membrane systems.