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Interactions between neutral phospholipid bilayer membranes

L J Lis, M McAlister, N Fuller

    Biophysical Journal
    |March 1, 1982
    PubMed
    Summary
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    Researchers studied forces between phospholipid bilayers, finding a hydration repulsion that varies with lipid type. This suggests potential structural changes and lipid segregation in interacting mixed phospholipid vesicles.

    Area of Science:

    • Biophysics
    • Materials Science

    Background:

    • Phospholipid bilayers are fundamental to cell membranes.
    • Understanding interbilayer forces is crucial for membrane biophysics and nanotechnology.

    Purpose of the Study:

    • To investigate the force-separation relationships between various phospholipid bilayers.
    • To determine the role of water and lipid composition in interbilayer interactions.

    Main Methods:

    • Force vs. separation measurements on 10 different phospholipid preparations.
    • Determination of water chemical potential in multilamellar lattices.
    • Estimation of interbilayer van der Waals forces.

    Main Results:

    • A continuous change in water chemical potential with bilayer separation was observed.

    Related Experiment Videos

  • An exponentially decaying hydration repulsion (2-3 Å decay distance) was found in most preparations.
  • Interactions showed sensitivity to phospholipid head group and acyl chain packing.

    • Conclusions:

    • Hydration repulsion is a key force governing bilayer interactions.
    • Lipid composition significantly influences interbilayer forces.
    • Interacting mixed phospholipid vesicles may undergo local structural changes and lipid segregation.