^2D NMR Study of the Dynamics of Bound Water Molecules in Dipalmitoyl-Phosphatidylcholine-D_2O System at a Low Water Content

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We found two doublet signals A and B in ^2D-NMR of dipalmitoyl-phosphatidylcholine-D_2O system at a low water content below the temperature of the onset of the main phase transition, i.e. in the β'-crystalline (L_β') phase. The splitting of each doublet becomes minimum at the onset of the transition. The signal A decreases in intensity with a slight increase of its splitting as the temperature increases further, accompanying the marked growth of the signal B in its intensity and splitting. These features of two doublets in the L_β' phase and at higher temperatures have never been noticed. The signals A and B were ascribed to the tightly bound water and the loosely bound water, respectively. These assignments were confirmed by the theoretical calculations of the splitting of the doublet A for all possible number of the tightly bound water molecules
社団法人日本物理学会の論文
2003-06-15