Phase behavior of pure lipid bilayers with mismatch interactions

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Recently Corvera, Laradji, and Zuckermann (unpublished) showed that the multistate lattice model due to Pink, Green, and Chapman [Biochemistry 20, 6692 (1981)] with parameters obtained from fitting to thermodynamic data for saturated phospholipid bilayers does not exhibit a phase transition but could instead be described in terms of short-range fluctuations close to a critical point. We have extended the Pink-Green-Chapman model by including hydrophobic mismatch interactions between the lipid acyl-chain conformational states. We used Monte Carlo techniques to examine the phase behavior of the extended model and found that it exhibits first-order phase transitions above a critical value of the mismatch parameter. The results are discussed in relation to previous theoretical work as well as experimental measurements on lipid bilayers.

Original languageEnglish
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number10
Pages (from-to)7560-7567
Number of pages8
Publication statusPublished - 1992
Externally publishedYes

ID: 236892243