Thermodynamic Approach to Phase Coexistence in Ternary Phospholipi-Cholesterol Mixtures

Details Thermodynamic Approach to Phase Coexistence in Ternary Phospholipi-Cholesterol Mixtures Thermodynamic Approach to Phase Coexistence in Ternary Phospholipi-Cholesterol Mixtures

2011-03-31

arxiv.org/abs/1103.6106v1

Physical Review Letters 106 (2011) 128104

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.106.128104

We introduce a simple and predictive model for determining the phase stability of ternary phospholipid-cholesterol mixtures. Assuming that competition between the liquid and gel order of the phospholipids is the main driving force behind lipid segregation, we derive a Gibbs free-energy of mixing, based on the thermodynamic properties of the lipids main transition. A numerical approach was devised that enable the fast and efficient determination of the ternary diagrams associated with our Gibbs free-energy. The computed phase coexistence diagram of DOPC/DPPC/cholesterol reproduces well known features for this system at 10\circ C, as well as its evolution with temperature.

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