A novel method was developed for measuring alcohol content in Chinese Baijiu using proton nuclear magnetic resonance spectroscopy (1H NMR). In this method, a fitting curve of ethanol concentration vs the integral ratio of methylene and water hydroxyl peaks was established, and the correlation coefficient was R2=0.994 7. At the same time, a working curve was prepared on account of methyl peak position, the correlation coefficient was R2=0.991 8. The linearities of both curves were good. The concentration obtained by 1H NMR was less than 0.02 compared with the labeled value, which met the requirements of current food safety standards. This method exhibits a fairly good analytical performance and saves time, which is easy to operate when dealing with a batch of samples for enterprises and testing departments.
LIU Enman
,
LI Xueyu
,
ZONG Xuyan
,
LI Li
,
WANG Shoufeng
. Detection of alcohol content in Chinese Baijiu based on 1H nuclear magnetic resonance spectrum[J]. Food and Fermentation Industries, 2021
, 47(12)
: 231
-235
.
DOI: 10.13995/j.cnki.11-1802/ts.025708
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