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- W2088792474 abstract "Abstract The polymorphism of hydrated ceramides containing α-hydroxy fatty acids (HFAC) and the effect of cholesterol-3sulfate (CS) on this polymorphism were investigated using DSC and FTIR spectroscopy. HFAC has two gel phases, one is stable and the other is metastable. The stable gel phase exhibits a main transition at 77.5°C with an enthalpy change of 11.5 kcal/mol. At this temperature, the frequency of the methylene symmetric stretching band shows an abrupt shift from 2847 to 2853 cm −1 . The phase above 77.5°C supercools to the metastable gel phase, with disrupted hydrogen bonds of the headgroups and disordered alkyl chains in comparison with the stable gel phase. Conversion from the metastable to the stable gel phase is a time- and temperature-dependent process and is suggested to involve dehydration of the headgroups, a rearrangement of hydrogen bonds and reordering of the alkyl chains. CS lowers and broadens the main phase transition of HFAC as a result of interfering with the lipid packing and a reduction of the cooperativity of the transition." @default.
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- W2088792474 date "1995-08-01" @default.
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- W2088792474 title "Calorimetric and infrared spectroscopic study of phase behavior of hydroxyceramides/cholesterol-3-sulfate system" @default.
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