Characterization and analysis of the volatile components of Cyclocarya paliurus tea from different origins based on GC-IMS technology

Abstract

Objective: To investigate the differences in volatile odor substances of Cyclocarya paliurus tea from different origins. Methods: Taking Cyclocarya paliurus tea from Changde, Zhangjiajie, Shaoyang in Hunan, Xiushui in Jiangxi, Qiandongnan in Guizhou, and Enshi in Hubei as the research subjects, the gas chromatography-ion mobility spectrometry (GC-IMS) coupled with partial least squares discriminant analysis (PLS-DA) was used to investigate the characteristics of different volatiles and their similarities in green strychnine teas from different origins. Results: A total of 120 VOCs, including monomers of some substances and their polymers, were detected in Cyclocarya paliurus tea from different origins, which were 34 aldehydes, 21 olefins, 19 alcohols, 16 ketones, 10 esters, 8 carboxylic acids, 5 furans, 4 pyrazines, 2 ethers, and 1 benzene species, respectively. Among them, γ-pinene, styrene, 4-methyl-1-pentanol, and n-octanal were the main characteristic difference volatiles. Conclusion: There were some differences in the volatile organic compounds of Cyclocarya paliurus tea among different origins(P＜0.05). It is possible to distinguish between different origins of cymbopogon tea based on the characteristic volatile substances. GC-IMS technology can effectively realize the origin identification and quality control of GC tea.

Keywords

• cyclocarya paliurus tea
• volatile substances
• gas chromatography-ion mobility spectrometry (gc-ims)
• partial least squares discriminant analysis (pls-da)
• dynamic principal component analysis