NMR and DSC Study on the Phase Transition of Cetyl Glucoside-Water System(Analytical Chemistry)

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An ^1H and DSC study was done on the phase transition of a cetyl glucoside-water system. The system containing 23% water shows an exothermic peak at 45℃ in the course of cooling due to the phase transition from liquid crystal to gel state. Above the transition temperature T_c, the NMR spectra consist of two peaks attributable to the water and the mobile alkyl chain. The latter disappeared when the temperature was lowered below T_c as the result of crystalization of the chains, and a weak peak emerged in the position between them. It was attributed to the water hydrated strongly on the glucosyl group in the inner part of the surface layer and not exchanging position with free water. After the temperature of the sample was kept at 3℃ for four days, this signal disappeared, suggesting that the strongly hydrated water was expelled from the inner part and the surface structure was changed into a more riqid one. This change caused the elevation of T_c in the course of heating. The structures of the bilayer and the hydration are discussed and compared with those of phospholipids.
社団法人日本農芸化学会の論文
1991-04-23