Abstract
We propose a model for phase transitions involving hydrogen bonding in lipid bilayers. The model combines a five-state interacting hydrogen bonding model of the polar heads on a rectangular lattice with a ten-state model of the hydrocarbon chain states on a triangular lattice. Experimental data for the transition temperatures for the lipids dimyristoylphosphatidylcholine (DMPC) and dimyristoyl phosphatidylethanolamine (DMPE) are used to determine phenomenological parameters needed in Monte Carlo simulations of the lipid bilayers. The latent heats for the chain melting transitions of DMPC and DMPE are then computed in the simulations and compared with experiment.
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