Comparative Analysis of Volatile Compounds in Tieguanyin with Different Types Based on HS–SPME–GC–MS

Foods

Jinshui Huang¹  Jianren Wang¹  Lin Zeng²  Shan Jin²  Yanqing Fu³  Yongquan Xu³  Junfeng Yin³ 

[1] Anxi Taoyuan Organic Tea Farm Co., Ltd., Quanzhou 362400, China;College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China;Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, National Engineering Research Center for Tea Processing, Tea Research Institute Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, 9 South Meiling Road, Hangzhou 310008, China;

关键词: Tieguanyin;    oolong tea;    volatile compounds;    aroma;   

DOI  :  10.3390/foods11111530

来源: DOAJ

【 摘 要 】

Tieguanyin (TGY) is one kind of oolong tea that is widely appreciated for its aroma and taste. To study the difference of volatile compounds among different types of TGY and other oolong teas, solid-phase microextraction–gas chromatography–mass spectrometry and chemometrics analysis were conducted in this experiment. Based on variable importance in projection > 1 and aroma character impact > 1, the contents of heptanal (1.60–2.79 μg/L), (E,E)-2,4-heptadienal (34.15–70.68 μg/L), (E)-2-octenal (1.57–2.94 μg/L), indole (48.44–122.21 μg/L), and (E)-nerolidol (32.64–96.63 μg/L) in TGY were higher than in other varieties. With the increase in tea fermentation, the total content of volatile compounds decreased slightly, mainly losing floral compounds. Heavily fermented tea contained a higher content of monoterpenoids, whereas low-fermentation tea contained higher contents of sesquiterpenes and indole, which could well distinguish the degree of TGY fermentation. Besides, the volatiles analysis of different grades of TGY showed that the special-grade tea contained more aroma compounds, mainly alcohols (28%). (E,E)-2,4-Heptadienal, (E)-2-octenal, benzeneacetaldehyde, and (E)-nerolidol were the key volatile compounds to distinguish different grades of TGY. The results obtained in this study could help enrich the theoretical basis of aroma substances in TGY.

【 授权许可】

Unknown