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Molecules 2018, 23(2), 104; https://doi.org/10.3390/molecules23020104

Metabolite Profiling of 14 Wuyi Rock Tea Cultivars Using UPLC-QTOF MS and UPLC-QqQ MS Combined with Chemometrics

1
College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2
FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
3
Wuyi Star Tea Industry Co., Ltd., Wuyishan 354300, China
4
Center for Plant Cell Biology, Institute of integrated Genome Biology, and Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA
*
Author to whom correspondence should be addressed.
Received: 25 December 2017 / Revised: 19 January 2018 / Accepted: 20 January 2018 / Published: 24 January 2018
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Abstract

Wuyi Rock tea, well-recognized for rich flavor and long-lasting fragrance, is a premium subcategory of oolong tea mainly produced in Wuyi Mountain and nearby regions of China. The quality of tea is mainly determined by the chemical constituents in the tea leaves. However, this remains underexplored for Wuyi Rock tea cultivars. In this study, we investigated the leaf metabolite profiles of 14 major Wuyi Rock tea cultivars grown in the same producing region using UPLC-QTOF MS and UPLC-QqQ MS with data processing via principal component analysis and cluster analysis. Relative quantitation of 49 major metabolites including flavan-3-ols, proanthocyanidins, flavonol glycosides, flavone glycosides, flavonone glycosides, phenolic acid derivatives, hydrolysable tannins, alkaloids and amino acids revealed clear variations between tea cultivars. In particular, catechins, kaempferol and quercetin derivatives were key metabolites responsible for cultivar discrimination. Information on the varietal differences in the levels of bioactive/functional metabolites, such as methylated catechins, flavonol glycosides and theanine, offers valuable insights to further explore the nutritional values and sensory qualities of Wuyi Rock tea. It also provides potential markers for tea plant fingerprinting and cultivar identification. View Full-Text
Keywords: Wuyi Rock tea; quality; UPLC-QTOF MS; UPLC-QqQ MS; metabolite profiling; metabolomics; cluster analysis; cultivars Wuyi Rock tea; quality; UPLC-QTOF MS; UPLC-QqQ MS; metabolite profiling; metabolomics; cluster analysis; cultivars
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Chen, S.; Li, M.; Zheng, G.; Wang, T.; Lin, J.; Wang, S.; Wang, X.; Chao, Q.; Cao, S.; Yang, Z.; Yu, X. Metabolite Profiling of 14 Wuyi Rock Tea Cultivars Using UPLC-QTOF MS and UPLC-QqQ MS Combined with Chemometrics. Molecules 2018, 23, 104.

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