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Eutectic interactions in binary systems containing cholesterol, cholesteryl esters and triacylglycerols.

D L Dorset1

  • 1Electron Diffraction Department, Medical Foundation of Buffalo, Inc., NY 14203.

Biochimica Et Biophysica Acta
|November 12, 1990
PubMed
Summary

This study investigates lipid phase behavior, finding that van der Waals forces often dominate over cholesterol's hydrogen bonding in mixtures. Unexpected nonideal behavior was observed in some triacylglycerol and cholesterol ester combinations.

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Area of Science:

  • Physical Chemistry
  • Lipid Science
  • Materials Science

Background:

  • Understanding the phase behavior of lipid mixtures is crucial for various applications, including food science and drug delivery.
  • Cholesterol's unique structure, with both polar and nonpolar regions, influences its interactions with other lipids.

Purpose of the Study:

  • To investigate the binary phase behavior of saturated cholesterol esters with trilaurin or cholesterol, and cholesterol with trilaurin.
  • To determine the role of specific molecular interactions, such as hydrogen bonding and van der Waals forces, in governing lipid mixture phase diagrams.

Main Methods:

  • Analysis of binary phase diagrams, focusing on liquidus curves.
  • Comparison of experimental data with ideal theory of freezing point depression.

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  • Application of the Bragg-Williams model for corrections to theoretical curves.
  • X-ray diffraction data to assess the fractionation of eutectic solids.

    • Main Results:

    • Phase diagrams were sometimes well-explained by ideal solution theory, suggesting van der Waals interactions are more significant than cholesterol's polar interactions.
    • X-ray data confirmed that eutectic solids were nearly totally fractionated.
    • Observed nonideal solution behavior in triacylglycerol with cholesterol esters was unexpected, as polar interactions were presumed to be shielded.

    Conclusions:

    • The study highlights the complex interplay of intermolecular forces in lipid mixtures.
    • While van der Waals forces often dominate, cholesterol's hydrogen bonding can lead to nonideal behavior in specific binary systems.
    • The unexpected nonideal behavior in triacylglycerol-cholesterol ester mixtures warrants further investigation into the structural basis of these interactions.