Comparison of direct injection and headspace injection method in determination of methanol in Baijiu
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Sichuan Institute of Product Quality Supervision＆Inspection, Chengdu 610100, China
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Published
2017-08-25
Issue Date
2017-09-22
Abstract
The methanol determination method in Baijiu was compared between the direct injection method and headspace injection method. The direct injection method was conducted according to GB/T 5009.48—2003 by direct sampling, and the chromatographic conditions were improved and optimized. When the samples were measured by methanol headspace method, the sample volume, heating temperature was optimized and the optimal chromatographic condition was established. The linearity of two methods ranged from 0.032 g/L to 1.288 g/L. The detection limit of direct injection method was 0.04 g/L, the adding standard recovery rate range was 90%-110%, relative standard deviation (RSD)＜1%, and the results uncertainty of the method was (0.166±0.012) g/L. The detection limit of headspace method was 0.02 g/L, the adding standard recovery rate range was 90%-110%, RSD＜3%, and the results uncertainty of the method was (0.160±0.012) g/L. Two methods were used to determine the 20 kinds of Baijiu samples, the results were analyzed by paired t test, and there was no significant difference (P＞0.05). The direct injection method had no pretreatment process, it was simple and rapid with high precision, low sensitivity. The detection limit of headspace method was lower, and the sensitivity was higher.
LUO Yue, CHENG Guihong, ZHONG Hongxia, WANG Jian, XU Yuecheng.
Comparison of direct injection and headspace injection method in determination of methanol in Baijiu[J]. China Brewing, 2017, 36(8): 161-164 https://doi.org/10.11882/j.issn.0254-5071.2017.08.035
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