GC-IMS结合化学计量学分析8 个产区香椿挥发性成分差异

采用气相色谱-离子迁移谱（gas chromatography-ion mobility spectrometry，GC-IMS）技术研究8 个产区香椿挥发性成分差异。共鉴定出56 种化合物，醇类和醛类的相对含量较高。基于化学计量学主成分分析和偏最小二乘判别分析（partial least squares-discriminant analysis，PLS-DA）可以很好区分8 个产区香椿样品。基于PLS-DA模型的变量投影重要性（variable importance in projection，VIP）得分对8 个产区香椿挥发性有机化合物进行判别分析，筛选出12 种（VIP＞1）标志挥发性化合物，其中(E)-2-己烯醛-D、乙酸乙酯-D、苯酚、糠醛、苯乙醇是主要的差异代谢物。不同产区香椿挥发性化合物存在较大差异。GC-IMS可以实现对不同产区香椿挥发性化合物的差异化快速分析，为香椿挥发性香气差异研究提供有益依据。

Differences in Volatile Organic Compounds of Toona sinensis from Eight Production Regions Analyzed by Gas Chromatography-Ion Mobility Spectrometry Combined with Chemometrics

The difference in the volatile composition of Toona sinensis from eight production areas was evaluated by gas chromatography-ion mobility spectrometry (GC-IMS). A total of 56 compounds were identified, the major ones being alcohols and aldehydes. Using principal component analysis (PCA) and partial least squares-discriminant analysis (PLS-DA), T. sinensis samples from the eight production areas were well distinguished. A total of 12 volatile compounds with a variable importance in projection (VIP) score greater than one were selected as marker compounds, among which, (E)-2-hexenal-D, ethyl acetate-D, p-ethylphenol, furfural and benzeneethanol were found to be the major differential metabolites. The volatile composition of T. sinensis from different production areas was significantly different. GC-IMS could allow for the rapid identification of the differential volatile organic compounds in T. sinensis from different production regions, which provides a useful basis for the study of the difference in the volatile aroma composition of T. sinensis from different production areas.