Abstract
Abstract The temperature-pressure phase diagrams for dipalmitoylphosphatidylcholine (DPPC) and dihexadecylphosphatidylcholine (DHPC) bilayer membranes were constructed in the pressure range up to 200 MPa. The DPPC and DHPC membranes exhibited similar phase behavior for the main transition. However, the most surprisingly difference between DPPC and DHPC lies in the pretransition. The pressure-induced, interdigitated gel (L β I) phase was found in the DPPC membrane at high pressures above 100 MPa. In contrast, the DHPC membrane exists in the L β I phase at low temperature below 33.6 °C and ambient pressure. The ripple gel phase of DHPC membrane disappeared at high pressure above 130 MPa.
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