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Fatty acids diffusion in lecithin multilayers: hydration and PH effects.

J L Rigaud, C M Gary-Bobo, A Sanson

    Chemistry and Physics of Lipids
    |January 1, 1977
    PubMed
    Summary
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    The diffusion of fatty acids in lecithin-water phases depends on their chain length and ionization state, influenced by pH and hydration. Longer, ionized fatty acids diffuse slower, localizing differently within the lamellar system.

    Area of Science:

    • Physical Chemistry
    • Materials Science
    • Biophysics

    Background:

    • Lecithin-water lamellar phases are model systems for biological membranes.
    • Fatty acid diffusion is crucial for understanding membrane dynamics and lipid interactions.

    Purpose of the Study:

    • To investigate the diffusion of sodium salts of monocarboxylic fatty acids in lecithin-water lamellar phases.
    • To determine how water content, pH, and fatty acid chain length affect diffusion coefficients.
    • To elucidate the relationship between fatty acid ionization state, localization, and diffusion dynamics.

    Main Methods:

    • Studied diffusion coefficients of fatty acids (formate to stearate) in lecithin-water lamellar phases.
    • Varied water content and pH to observe effects on diffusion.

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  • Analyzed diffusion behavior in relation to fatty acid chain length and ionization.

    • Main Results:

    • Diffusion rates decreased rapidly for shorter fatty acids (formate to butyrate) localized in the hydrophilic layer.
    • Longer fatty acids (butyrate to stearate) showed slower diffusion decrease, indicating lateral diffusion at the hydrophilic-lipophilic interface.
    • Diffusion coefficients were strongly dependent on phase hydration and pH, which control fatty acid ionization and localization.

    Conclusions:

    • Fatty acid diffusion in lecithin-water lamellar phases is governed by chain length, ionization state, and localization.
    • Altering pH and hydration levels significantly impacts fatty acid ionization, localization, and consequently, their diffusion rates.
    • The findings provide insights into the molecular mechanisms of lipid diffusion within complex lamellar systems.