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JETP Letters

, Volume 107, Issue 11, pp 718–724 | Cite as

Microscopic Description of the Thermodynamics of a Lipid Membrane at a Liquid–Gel Phase Transition

  • B. Kheyfets
  • T. Galimzyanov
  • S. Mukhin
Biophysics
  • 8 Downloads

Abstract

A microscopic model of the lipid membrane is constructed that provides analytically tractable description of the physical mechanism of the first order liquid–gel phase transition. We demonstrate that liquid–gel phase transition is cooperative effect of the three major interactions: inter-lipid van der Waals attraction, steric repulsion and hydrophobic tension. The model explicitly shows that temperature-dependent inter-lipid steric repulsion switches the system from liquid to gel phase when the temperature decreases. The switching manifests itself in the increase in lateral compressibility of the lipids as the temperature decreases, making phase with smaller area more preferable below the transition temperature. The model gives qualitatively correct picture of abrupt change at transition temperature of the area per lipid, membrane thickness and volume per hydrocarbon group in the lipid chains. The calculated dependence of phase transition temperature on lipid chain length is in quantitative agreement with experimental data. Steric repulsion between the lipid molecules is shown to be the only driver of the phase transition, as van der Waals attraction and hydrophobic tension are weakly temperature dependent.

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.National University of Science and Technology MISiSMoscowRussia
  2. 2.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia

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