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Voltage-dependent capacitance in lipid bilayers made from monolayers.

O Alvarez, R Latorre

    Biophysical Journal
    |January 1, 1978
    PubMed
    Summary
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    Electrocompression in lipid bilayers was measured, revealing a significantly smaller capacitance change (alpha) compared to solvent-containing membranes. This suggests electrostriction contributes minimally to biological membrane charge displacement.

    Area of Science:

    • Biophysics
    • Membrane Biophysics
    • Lipid Bilayer Studies

    Background:

    • Lipid bilayers are fundamental to cell membranes.
    • Understanding their electrical properties is crucial for cell function.
    • Electrocompression quantifies mechanical stress-induced capacitance changes.

    Purpose of the Study:

    • To measure electrocompression in lipid bilayers formed by monolayer apposition.
    • To characterize the relationship between capacitance and membrane potential.
    • To compare electrocompression in lipid bilayers with solvent-containing membranes and biological systems.

    Main Methods:

    • Formation of lipid bilayers via apposition of two monolayers.
    • Measurement of capacitance as a function of membrane potential (C(V)).

    Related Experiment Videos

  • Analysis using the equation C(V) = C(O) [1 + alpha(V + delta psi)2].

    • Main Results:

    • Capacitance followed the described equation, with alpha = 0.02 V-2 for lipid bilayers.
    • This alpha value is approximately 500-fold smaller than in solvent-containing membranes.
    • Surface potential difference (delta psi) in asymmetric bilayers matched independent charge density measurements.

    Conclusions:

    • Lipid bilayers formed by monolayer apposition exhibit significantly reduced electrocompression compared to solvent-containing membranes.
    • Electrostriction-derived nonlinear capacitative charge displacement is likely a minor component (<1%) of total gating charge in biological membranes.
    • The study provides quantitative insights into the electromechanical properties of lipid bilayers.