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- W2045832839 abstract "The disaccharides, sucrose and trehalose, markedly decreased (up to 17-13C°) the temperature of the lamellar to hexagonal (Lα →HII) phase transition and simultaneously increase by 2–4 C° the temperature of the lamellar gel to lamellar liquid-crystal (Lβ →Lα) phase transition in hydrated dihexadecylphosphatidylethanolamine and distearoylphosphatidylethanolamine. These two transitions merge and convert into a single Lβ-HII phase transition when dispersed in 2.4 M sucrose. These results are inconsistent with recent reports by 8, 9) which suggest that trehalose stabilizes the Lα phase relative to the HII phase and shifts upwards beyond detectability the Lα-HII transition. The present results are considered as a manifestation of the Hofmeister effect in which the sugars act as kosmotropic reagents stabilizing the structure of bulk water. This tends to decrease the area of contact between the lipid and the aqueous phases and favours the HII and Lβ phases relative to Lα phase. This hypothesis is consistent with the effects of chaotropic reagents on the Lα-HII phase transition (Yeagle and Sen (1986) Biochemistry 25, 7518–7522) and on the stability of the lamellar phase of dipalmitoylphosphatidylcholine (Oku and MacDonald (1983) J. Biol. Chem. 258, 8733–8738)." @default.
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- W2045832839 date "1989-04-01" @default.
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- W2045832839 title "Sugars favour formation of hexagonal (HII) phase at the expense of lamellar liquid-crystalline phase in hydrated phosphatidylethanolamines" @default.
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