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Liquid-liquid immiscibility in lipid monolayers

J P Hagen1, H M McConnell

  • 1Department of Chemistry, Stanford University, CA 94305-5080, USA.

Biochimica Et Biophysica Acta
|November 25, 1997
PubMed
Summary

Binary lipid mixtures of unsaturated phosphatidylcholines and dihydrocholesterol exhibit liquid phase coexistence. Their phase diagrams reveal critical compositions near fifty mole percent, offering insights into lipid mixture thermodynamics.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Lipid mixtures at interfaces can form distinct liquid phases.
  • Understanding these phase behaviors is crucial for biomembrane and materials science.

Purpose of the Study:

  • To investigate the pressure-composition phase diagrams of binary mixtures of unsaturated phosphatidylcholines and dihydrocholesterol.
  • To determine critical compositions and exponents for these lipid mixtures.
  • To model the thermodynamic non-ideality of these binary mixtures.

Main Methods:

  • Spreading binary lipid mixtures at the air/water interface.
  • Measuring pressure-composition phase diagrams.
  • Analyzing data using critical exponent analysis and regular solution thermodynamic models.

Main Results:

  • Four binary lipid mixtures studied showed liquid phase coexistence.
  • Critical compositions were found to be approximately fifty mole percent.
  • Average critical exponents were determined to be 0.25 +/- 0.07.
  • The regular solution thermodynamic model provided a good approximation for the data.

Conclusions:

  • The study elucidates the phase behavior of specific unsaturated phosphatidylcholine-dihydrocholesterol mixtures.
  • The findings provide thermodynamic parameters characterizing the non-ideal mixing of these lipids.
  • This research contributes to the understanding of lipid self-assembly and interfacial phenomena.

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