Workshop on Biomaterials and Their Interactions with Biological and Model Membranes Salou 2011

A thermodynamic approach to phase coexistence in ternary cholesterol-phospholipid mixtures Jean Wolff, Carlos M. Marques and Fabrice Thalmann Institut Charles Sadron, Université de Strasbourg, CNRS UPR 22, 23 rue du Loess, Strasbourg Cedex, F-67037, France. [email protected]

Abstract We present a simple and predictive model for describing the phase stability of ternary cholesterolphospholipid mixtures. Assuming that competition between the liquid and gel organizations of the phospholipids is the main driving force behind lipid segregation, we derive a phenomenological Gibbs free-energy of mixing, based on the calorimetric properties of the lipids main transition. Gibbs phase diagrams are numerically obtained that reproduces the most important experimental features of DPPCDOPC-Chol membranes, such as regions of triple coexistence and liquid ordered -liquid disordered segregation. Based on this approach, we present a scenario for the evolution of the phase diagram with temperature. Results for other phospholipid species, such as POPC or PSM will also be presented. J. Wolff, C. M. Marques, and F. Thalmann Phys. Rev. Lett. 106, 128104 (2011)

Environmentally Degradable Full Carbon Backbone Polymers

We present a simple and predictive model for describing the phase stability of ternary cholesterol- phospholipid mixtures. Assuming that competition between the liquid and gel organizations of the phospholipids is the main driving force behind lipid segregation, we derive a phenomenological Gibbs free-energy of mixing, ...
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