Natural-abundance oxygen-17 magnetic relaxation in aqueous solutions of carbohydrates.
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概要
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The spin-lattice relaxation times, <I>T</I><SUB>1</SUB>, of H<SUB>2</SUB><SUP>17</SUP>O have been measured for aqueous solutions of several pentoses, hexoses, di-, and trisaccharides as a function of the concentration at 25 °C. The coordination numbers, <I>n</I><SUB>h</SUB>, and the rotational correlation times, τ<SUB>c</SUB><SUP>h</SUP>, of water molecules around the sugars were estimated and compared with that of pure water, τ<SUB>c</SUB>°. The value of τ<SUB>c</SUB><SUP>h</SUP>⁄τ<SUB>c</SUB>°=4.10 for glucose is largest, while that of τ<SUB>c</SUB><SUP>h</SUP>⁄τ<SUB>c</SUB>°=2.82 for ribose is the smallest, among these sugars. The value of <I>n</I><SUB>h</SUB> (τ<SUB>c</SUB><SUP>h</SUP>⁄τ<SUB>c</SUB>°−1) was defined as the dynamic hydration number. The dynamic hydration numbers showed a good correlation with the mean number of the equatorial OH groups and the limiting diffusion coefficients.
- 公益社団法人 日本化学会の論文
著者
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Uedaira Hisashi
Department Of Materials Chemistry Faculty Of Engineering Hosei University
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Ikura Mitsuhiko
Department of Polymer Science, Faculty of Science, Hokkaido University
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Uedaira Hatsuho
Research Institute for Polymeres and Textiles
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