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Planar bilayer membranes from pure lipids.

R C Waldbillig, G Szabo

    Biochimica Et Biophysica Acta
    |November 2, 1979
    PubMed
    Summary

    Solventless lipid bilayers exhibit high capacitance, similar to cell membranes. Their thickness, determined by monoglyceride chain length, indicates fluid lipid acyl chains in pure monoglyceride membranes.

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    Area of Science:

    • Biophysics
    • Membrane Science

    Background:

    • Planar lipid bilayers are crucial for studying cell membrane properties.
    • Conventional bilayers often use hydrocarbon solvents, which can alter membrane structure.
    • Solventless methods offer a more biologically relevant approach.

    Purpose of the Study:

    • To characterize solventless lipid bilayers formed from pure lipid mixtures.
    • To investigate the influence of lipid composition on bilayer dielectric thickness.
    • To determine the structural properties of solventless monoglyceride/triglyceride bilayers.

    Main Methods:

    • Formation of planar lipid bilayers from pure lipid mixtures without organic solvents.
    • Measurement of specific capacitance and dielectric thickness of the bilayers.
    • Analysis of lipid composition and molecular volume to infer bilayer structure.

    Main Results:

    • Solventless bilayers showed high specific capacitance (586-957 nF/cm2), exceeding conventional lipid/decane bilayers.
    • Bilayer thickness was independent of triglyceride content but strongly dependent on monoglyceride chain length (16-24 carbons).
    • Evidence suggests bulk lipid mixtures disproportionate, forming bilayers of nearly pure monoglyceride.

    Conclusions:

    • Solventless lipid bilayers offer a robust model system with cell membrane-like capacitance.
    • Monoglyceride chain length is a key determinant of solventless bilayer thickness.
    • The findings support a model where monoglyceride acyl chains are fluid within the bilayer structure.

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