Journal
FOODS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/foods11111530
Keywords
Tieguanyin; oolong tea; volatile compounds; aroma
Categories
Funding
- Natural Science Foundation of Zhejiang [LQ20C160009]
- Key Research and Development Program of Zhejiang [2022C02033]
- Innovation Project for the Chinese Academy of Agricultural Sciences
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This study investigated the difference in volatile compounds among different types of Tieguanyin (TGY) and other oolong teas. The results showed that TGY exhibited higher levels of certain compounds compared to other varieties, and the degree of tea fermentation influenced the content of volatile compounds. Additionally, different grades of TGY contained varying levels of volatile compounds.
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 mu g/L), (E,E)-2,4-heptadienal (34.15-70.68 mu g/L), (E)-2-octenal (1.57-2.94 mu g/L), indole (48.44-122.21 mu g/L), and (E)-nerolidol (32.64-96.63 mu g/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.
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