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Multiple phase equilibria in binary mixtures of phospholipids.

E J Luna, H M McConnell

    Biochimica Et Biophysica Acta
    |June 2, 1978
    PubMed
    Summary
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    This study presents phase diagrams for lipid mixtures, detailing lateral phase separations and including solid phases for phosphatidylcholines. These diagrams improve upon previous models by incorporating both Pbeta' and Lbeta' solid phases.

    Area of Science:

    • Biochemistry
    • Materials Science
    • Physical Chemistry

    Background:

    • Phosphatidylcholines (PCs) are key components of biological membranes.
    • Understanding lipid phase behavior is crucial for membrane biophysics and drug delivery systems.
    • Previous phase diagrams for PC mixtures often lacked detailed solid-phase information.

    Purpose of the Study:

    • To construct approximate phase diagrams for binary mixtures of dimyristoyl phosphatidylcholine (DMPC) with dipalmitoyl phosphatidylcholine (DPPC), distearoyl phosphatidylcholine (DSPC), and dipalmitoyl phosphatidylethanolamine (DPPE).
    • To incorporate both Pbeta' and Lbeta' solid phases into the phase diagrams.
    • To analyze binary mixtures exhibiting two distinct Pbeta' phases that do not form continuous solid solutions.

    Main Methods:

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  • Construction of approximate phase diagrams.
  • Utilizing freeze-fracture electron microscopy data.
  • Analysis of lateral phase separation phenomena in lipid binary mixtures.

    • Main Results:

    • Phase diagrams were generated for DMPC with DPPC, DSPC, and DPPE, illustrating lateral phase separations.
    • The diagrams accurately represent Pbeta' and Lbeta' solid phases of phosphatidylcholines.
    • Consideration was given to mixtures with two non-continuous Pbeta' solid phases.

    Conclusions:

    • The developed phase diagrams provide a more comprehensive understanding of lipid mixture behavior, especially concerning solid phases.
    • These findings enhance models of membrane lateral organization and phase transitions.
    • The study addresses complexities in binary lipid mixtures with limited solid solution formation.