Analysis of Sensory Properties and Characteristic Flavor Substances of Jiangxiang Baijiu with Oil Flavor
Normal Jiangxiang Baijiu and Jiangxiang Baijiu with oil flavor were taken as the research objects,and their sensory proper-ties and flavor components were studied by sensory quantitative descriptive analysis(QDA),gas chromatography-hydrogen flame ion detection(GC-FID),high performance liquid chromatography(HPLC),and liquid chromatography-mass spectrometry(LC-MS).The results showed that the Jiangxiang Baijiu with oil flavor had prominent oil flavor,and its Daqu aroma,floral and fruity aroma,aging aroma,sweetness and sourness were all lower than those of the normal Jiangxiang Baijiu.81 main flavor components in the samples were quantitatively analyzed,and the total content of flavor substances in the samples with oil flavor were slightly lower than that in the normal samples.There were differences in the relative ratio of the quantity of flavor components between the two kinds of sam-ples.Orthogonal partial least squares discriminant analysis(OPLS-DA)could be used to identify the two kinds of samples.30 key dif-ferential substances were screened out based on the variable importance in the projection(VIP)values.Linoleic acid,ethyl linoleate,oleic acid,acetoin,and 2,3-butanedione were the important factors that constituted the oil flavor of Baijiu.This study has provided methodological reference and theoretical basis for the analysis of off-flavor compounds and the quality control of Baijiu.