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标题：Distribution and Quantification of 1,2-Propylene Glycol Enantiomers in Baijiu
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作者：Hao Xu ; Yifeng Dai ; Shuyi Qiu 等
期刊名称：Foods
电子版ISSN：2304-8158
出版年度：2021
卷号：10
期号：12
DOI：10.3390/foods10123039
语种：English
出版社：MDPI Publishing
摘要：Enantiomers of 1,2-Propylene glycol (1,2-PG) were investigated in 64 commercial Chinese Baijiu including soy sauce aroma-type Baijiu (SSB), strong aroma-type Baijiu (STB), and light aroma-type Baijiu (LTB), via chiral gas chromatography ( β-cyclodextrin). The natural enantiomeric distribution and concentration of 1,2-PG in various baijiu were studied to evaluate whether the distribution and content of the two isomers of 1,2-PG were correlated with the aroma type and storage year. The results showed that 1,2-PG has a high enantiomeric ratio and the ( S)-configuration predominated in SSB. The average S/ R enantiomeric ratio of this compound in SSB was approximately 87:13 (±3.17), with an average concentration of 52.77 (±23.70) mg/L for the ( S)-configuration and 8.72 (±3.63) mg/L for the ( R)-enantiomer. The ( R)-configuration was predominant in the STB, whereas neither ( S) nor ( R)-form of 1,2-PG were detected in LTB. The content of the two configurations of 1,2-PG in the JSHSJ vintage of SSB showed a wave variation, with an average S/ R enantiomeric ratio of 89:11 (±1.15). The concentration of ( R)-1,2-PG in XJCTJ vintage liquors showed an upward and then downward trend with aging time, with an overall downward trend, and the concentration of ( S)-form showed a wavy change with an overall upward trend. Except for the LZLJ-2019 vintage where both ( R) and ( S)-1,2-PG were present, all other samples only existed ( R)-form, and a decreasing trend of ( R)-enantiomer with aging time was observed. The enantiomeric ratio of 1,2-PG might be one of the potential markers for adulteration control of Baijiu as industrial 1,2-PG usually presented in the racemic mixture. Sensory analysis revealed olfactory thresholds of 4.66 mg/L and 23.92 mg/L for the ( R)- and ( S)-configurations in pure water respectively. GC-O showed both enantiomers exhibited different aromatic nuances.
关键词：1;2-Propylene glycol; enantiomer; chiral gas chromatography; Baijiu; aroma