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In order to explore the composition of main volatile compounds and the difference of aroma compounds in Sauce-flavor Baijiu with different sweet flavor characteristics, sensory evaluation method was used to select Sauce-flavor Baijiu samples, the volatile components were analyzed by headspace solid phase microextraction (HS-SPME) combined with gas chromatography-mass spectrometry (GC-MS), and partial least squares discriminant analysis (PLS-DA) was used to analyze different Baijiu samples and their flavor differences substances. The results showed that the samples were divided into three groups, and the intensity values of sweet-flavor in each group were 4.0~5.0, 3.0~4.0 and 0.0~3.0, respectively, and a total of 68 volatile flavor compounds were characterized, including 27 esters, 12 alcohols, 10 aldehydes and ketones, 3 acids, 10 aromatics and 6 terpenes, among them, esters, aromatics and alcohols with sweet and fruity aromas were the three most abundant types of compounds in different Baijiu samples, and the content was the highest in Baijiu samples with a sweet flavor intensity greater than 3.0, indicating that these three types of substances had an important impact on the flavor characteristics of sweet aroma. There were 25 potential difference compounds affecting the three groups of Baijiu samples, and the related sweet flavor markers were mainly 3-methyl butanol, ethyl octanoate, isobutyl lactate and ethyl phenylacetate, indicating that these substances were the important aroma compounds that cause differences between different sauce-flavor Baijiu samples with different sweet flavor characteristics.

Vanillin is a very important aroma compound in alcoholic beverages. It has been widely concerned because of its pleasant sweet aroma, vanilla aroma and physiological function. Vanillin has strong polarity and trace in alcoholic beverage, so conventional detection methods are difficult to effectively detect the content of vanillin in alcoholic beverage. Therefore, exploring the analysis method of vanillin in alcoholic beverage has always been a research topic. The cell wall of the raw and auxiliary materials of alcoholic beverage is rich in lignin and ferulic acid, which is an important precursor for the formation of vanillin. It can be converted into vanillin in the brewing process through metabolic pathways such as non oxidative decarboxylation reaction of fungi, bacteria and other microorganisms. In this paper, analytical method, aroma contribution, different content and formation mechanism of vanillin in alcoholic beverage are reviewed, which can provide theoretical reference for the research of vanillin in alcoholic beverage.