Phase Transition of Lipid Multilamellar Aqueous Suspension under High Pressure : I. Investigation of Phase Diagram of Dipalmitoyl Phosphatidylcholine Bimembrane by High Pressure-DTA and -Dilatometry

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The pressure and temperature phase diagrams of DPPC bilayers have been obtained by DTA and dilatometry. Under atmospheric pressure DPPC shows three phase transitions at 42℃, 36℃ and around 18℃, corresponding to the main-,pre- and sub-transitions respectively. Throughout our experiments we discovered very interesting phenomena in these transitions due to the effect of pressure and are as follows. First, the presence of a tricritical point on the pre-transitionline has been found at about 2.5 kbar and 78℃, where the first order transition changes to a second order transition.Second, the sub-transition could be observed under high pressure without annealing procedure which required to stock DPPC at about 0℃ for three or four days under atmospheric pressure. Third, a new fourth transition below the sub-transition temperature has been discovered.
社団法人応用物理学会の論文
1985-03-20