Abstract
The phase transitions of l,2-dioleoyl-sn-glycero-3-phospho-choline (DOPC) bilayer membranes were observed by high-pressure optical methods. The so-called main transition between the liquid crystalline (Lα) and the lamellar gel (Lβ) phases was observed in water at above 0 °C under high pressure, in addition to the transition between the La and the lamellar crystalline (Lc) phases in 50% aqueous ethylene glycol. The pressure of the main transition increased linearly with an increase in temperature. Extrapolation of temperature (T) - pressure (p) phase boundary to ambient pressure suggests the temperature of the main transition to be -40.3 °C, which has never been found by DSC methods. On the other hand, the temperature of the Lc/Lα phase transition in 50% aqueous ethylene glycol was found to be -12.0 °C at ambient pressure. The values of dT/dp were 0.233 KMPa-1 for the Lβ/Lα phase transition and 0.147 K MPa-1 for the Lc/Lα phase transition, respectively.
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