Natural-Abundance Oxygen-17 Magnetic Relaxation in Aqueous Solutions of Carbohydrates

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Abstract
The spin-lattice relaxation times, T1, of H217O 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, nh, and the rotational correlation times, τch, of water molecules around the sugars were estimated and compared with that of pure water, τc°. The value of τch⁄τc°=4.10 for glucose is largest, while that of τch⁄τc°=2.82 for ribose is the smallest, among these sugars. The value of nh (τch⁄τc°−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.

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