Identification of key metabolites based on non-targeted metabolomics and chemometrics analyses provides insights into bitterness in Kucha [Camellia kucha (Chang et Wang) Chang]
文献类型： 外文期刊
作者： Qin, Dandan 1 ; Wang, Qiushuang 1 ; Li, Hongjian 1 ; Jiang, Xiaohui 1 ; Fang, Kaixing 1 ; Wang, Qing 1 ; Li, Bo 1 ; Pan, 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Tea Res Inst, Guangdong Key Lab Tea Plant Resources Innovat & U, Guangzhou 510640, Guangdong, Peoples R China
关键词： Kucha [Camellia kucha (Chang et Wang) Chang]; UHPLC-LTQ-Orbitrap-MS; Non-targeted metabolomics; Bitter components; Alkaloid; Catechins
期刊名称：FOOD RESEARCH INTERNATIONAL （ 影响因子：6.475； 五年影响因子：6.508 ）
ISSN： 0963-9969
年卷期： 2020 年 138 卷
页码：
收录情况： SCI
摘要： Camellia kucha (Chang et Wang) Chang is a special tea in China, which is extremely bitter but beneficial for human health. However, there are no systematic studies on Kucha metabolites, especially those associated with bitterness. In this study, a non-targeted metabolomics approach based on UHPLC-LTQ-Orbitrap-MS was applied to comprehensively profile the characteristic metabolites of two Kucha cultivars by comparison with three common tea cultivars. A total of 90 differential metabolites were identified. Among them, eight key metabolites (theacrine, 2,4-dimethyl-1H-indole, EGCG, dihydrokaempferol, panasenoside, 3-cresotinic acid, 3-methylglutaconic acid, and L-histidine) were more abundant in Kucha than in the controls, most of which were positively correlated with bitterness. Furthermore, quantitative analysis of some important catechins and alkaloids by HPLC implied absolutely higher concentrations of EGCG and theacrine in Kucha, which was similar to the metabolomics results. These results will be contribute to future research on the bitter and nutritional properties of Kucha.
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