蒸留酒の熟成指標としての^<17>O-NMR半値幅について

概要

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The line width (full width at half maximum intenslty) of ^<17>0 nuclear magnetic resonance signals and the spin-lattice relaxation time, T_1, of aged commerclal distilled spirits and aqueous ethanol solutions were measured at 298K. The values of T_1 for the ^<17>O nucleus of water (which reflects the mobility of the water molecule) in both kinds of preparations did not change over the pH range of 2 to 13, but the line width broadened at pH from 5 to 9, as did that of pure water. That the broadenlng, whlch reached about 1OO Hz at pH7.0, depended on pH seemed to be due to changes in the exchange rates of protons. The T_1s of the aged commercial splrits and the ethanol solutions of the same concentration were almost the same. Therefore, when the line width of the ^<17>0-NMR signal is to be used as an index of the aging of spirits, it must be taken into account that the width depends on the pH of the materials.
社団法人日本農芸化学会の論文
1994-08-01