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Proton conduction in phosphatidylethanolamine

N Murase, K Gonda, I Kagami

    Chemistry and Physics of Lipids
    |August 1, 1977
    PubMed
    Summary
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    This study demonstrates proton conduction in phosphatidylethanolamine (PE) via hydrogen gas evolution during electrolysis. This occurs in PE

    Area of Science:

    • Biophysics
    • Materials Science
    • Electrochemistry

    Background:

    • Polycrystalline phosphatidylethanolamine (PE) conductivity was previously unconfirmed for proton conduction.
    • Understanding proton transport in phospholipids is crucial for biological and material applications.

    Purpose of the Study:

    • To investigate proton conduction in premelted phosphatidylethanolamine (PE).
    • To elucidate the mechanism of proton transport in PE using electrolysis.

    Main Methods:

    • Direct current (dc) conductivity measurements of polycrystalline PE from 60-120°C.
    • Electrolysis of PE in its premelted state (91-124°C) to observe gas evolution.
    • Analysis of hydrogen gas evolution and comparison with Faraday's law.

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    Main Results:

    • Hydrogen gas evolved during PE electrolysis between 91-124°C, indicating proton conduction.
    • Proton conduction likely follows the Grotthus mechanism along intermolecular hydrogen bonds.
    • Zwitter-ionic behavior facilitates cooperative proton transfer via hydrogen bond networks.
    • No polarization was observed in dc conduction experiments, attributed to efficient proton transfer.

    Conclusions:

    • Proton conduction, specifically Grotthus-type, is confirmed in premelted phosphatidylethanolamine (PE).
    • The cooperative zwitter-ionic mechanism explains efficient proton transfer and lack of polarization.
    • Deviations from Faraday's law in gas evolution warrant further investigation.