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NMR oxygen-17 studies of the state of water in a saturated sucrose solution

✍ Scribed by Brian P. Hills; Hui-ru Tang; Peter S. Belton; Abdul Khaliq; Robin K. Harris

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 734 KB
Volume: 75
Category: Article
ISSN: 0167-7322
DOI: 10.1016/s0167-7322(97)00019-6

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✦ Synopsis

The frequency dependence of the water oxygen-17 transverse and longitudinal relaxation times is used to investigate the dynamic state of water in a saturated sucrose solution at 298K. Assuming that the observed frequency dependence originates from the slow modulation of the residual quadrupole coupling of the water-sucrose interaction, an anisotropic rotation model is used to extract water rotational correlation times and the order parameter characterizing the water-sucrose dynamic complex. Although the theory succeeds in providing a quantitative fit to the longitudinal data there is an unexpected anomalous dephasing enhancement in the transverse relaxation, and the paper concludes with a discussion of the possible origins of this enhancement and of alternative models for the dynamic state of the water.

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