Determination of 3-methylthiopropanol, a characteristic component of sesame white liquor, by gas chromatography (FID)

Among the many white spirits in China, there are more than ten kinds of flavors such as sauce, strong, fragrant, rice, and sesame. The sauce, aroma and fragrance of rice have a long history and are relatively mature, tending to be standardized and stereotyped, while sesame-flavor liquor is a fragrant liquor that is independently innovated after the founding of the People's Republic of China. After nearly half a century of exploration and research, its aroma components, process mechanism and production operation points have become clear, product style is typical, self-contained, stable quality, has been well-known throughout the country , and now the industry has formed a production of sesame-flavor liquor upsurge. As the founding enterprise of sesame-flavor liquor, Jingzhi Liquor is at the forefront of the industry in the production, analysis and testing of sesame-flavor liquor. Due to its high technical content, unique style and good senses, high ethyl acetate content ( 1.89g/L ) and low ethyl hexanoate content ( 0.49g/L ), the product has both aroma, fragrance and sauce. The characteristics of the fragrant type, the sesame fragrance is elegant and pure, and is deeply loved by consumers.
      As a characteristic component of sesame-flavor liquor, “ 3- methylthiopropanol” has clear quality requirements in the national standard of “Sesame-flavor liquor”, but its content is low (≥ 0.5PPm ), if the instrument performance is poor. Or poor analytical conditions, traces of impurities and incomplete separation, will seriously affect the accurate quantification of 3- methylthiopropanol, which has a significant impact on the quality of sesame-flavor liquor, so choose a high-quality gas chromatograph and The correct analytical method to improve the "accuracy" of the analysis plays a decisive role in ensuring the quality of the sesame-flavor liquor.
      In related reports, some companies used gas chromatography ( FID ) coupled with capillary column PEG-20M and composite capillary column FFAP analysis, the measured 3- methylthiopropanol, sensitivity and accuracy are lower than the actual. In GB/T20824—2007 “Sesame-flavor liquor”, 3- methylthiopropanol was identified as the characteristic flavor substance of sesame-flavor liquor, and it was recommended to use gas chromatograph flame photometric detector ( FPD ) for analysis. In recent years, with the rapid development of science and technology, the overall performance of the instrument has been significantly improved. At the same time, there is a general lag in the revision of China's standards. The original method can no longer meet the requirements of modern technology. Although the FPD detector has a high response value to 3- methylthiopropanol, it cannot meet the routine analysis of the liquor component and is expensive, which is not conducive to the cost control of the liquor producer and the multi-purpose use of the machine. The sight of the enterprise.
      Through years of experience in gas chromatography production and analysis, the company uses Lutron GC-9860 gas chromatograph ( FID ) with LZP-930 capillary column or imported CP-WAX 57CB capillary column, specifically for " 3- methylthiopropyl " Alcohol has established a new analytical method to greatly improve the resolution and accuracy of the sesame-flavor component “ 3- methylthiopropanol”. In addition to the 3- methylthiopropanol analysis, this solution can also analyze the components of alcohols, aldehydes, acids and esters, providing more valuable information for complex brewing fermentation processes.

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