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Supported phospholipid bilayers.

L K Tamm, H M McConnell

    Biophysical Journal
    |January 1, 1985
    PubMed
    Summary

    Supported phospholipid bilayers exhibit distinct phase transitions and diffusion behaviors. Researchers observed defect-mediated diffusion in gel phases and lipid expansion leading to tubular liposomes.

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    Area of Science:

    • Materials Science
    • Biophysics
    • Surface Chemistry

    Background:

    • Phospholipid bilayers are crucial for biological membranes.
    • Understanding supported lipid bilayers is key for biomimetic applications.
    • Solid-supported bilayers offer a model system for membrane studies.

    Purpose of the Study:

    • To investigate phase transitions and lipid diffusion in supported phospholipid bilayers.
    • To characterize the behavior of different phospholipid types (DPPC, DOPC, DMPC) on solid substrates.
    • To explore defect formation and modulation in supported bilayers.

    Main Methods:

    • Formation of phospholipid bilayers on glass, quartz, and silicon surfaces via sequential monolayer transfer.
    • Lateral diffusion measurements using fluorescence recovery after pattern photobleaching.
    • Epifluorescence microscopy for observing bilayer morphology and defect formation.

    Main Results:

    • Two phase transitions were observed in DPPC bilayers, similar to multilayer systems.
    • Evidence for an intermediate phase (P beta' or ripple) in single bilayers.
    • Defect-mediated diffusion was identified in the low-temperature gel phase of DPPC.
    • Rapid diffusion of DOPC and DMPC above transition temperatures with specific activation energies.
    • DPPC bilayers formed tubular liposomes upon heating; DOPC bilayers formed void areas upon cooling.
    • Lysolecithin modulated the size and number of membrane defects.

    Conclusions:

    • Supported phospholipid bilayers exhibit complex phase behavior and diffusion dynamics.
    • The solid support significantly influences bilayer morphology and defect formation.
    • Defect-mediated diffusion is a key mechanism in gel-phase bilayers.
    • Lysolecithin can be used to control membrane defect formation.

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