关键词: 云南大叶种茶叶；酚类成分；准确定量；超高效液相色谱-串联质谱；比较分析

Abstract: Based on ultra-high performance liquid chromatography-triple quadrupole-tandem mass spectrometry (UPLC-QQQ-MS/MS), a high throughput, sensitive and specific method to quantify three classes of phenolic compounds in tea samples was developed and validated. This method possessed good linearity, accuracy and precision, and was successfully applied to the simultaneous quantification of 90 phenolic compounds (catechins, phenolic acids, flavonoids and their glycosides) in four types of Yunnan large-leaf tea. As a result, most phenolic components were more abundant in unfermented tea (green tea and Pu’erh raw tea), while free phenolic acids, flavonoid aglycones and theaflavins were more abundant in fermented tea (black tea and Pu’erh ripe tea). By partial least squares-discriminant analysis (PLS-DA), different types of tea were clearly discriminated according to their phenolic components, and a series of chemical markers were identified.

Key words: Yunnan large-leaf tea; phenolic compounds; accurate quantification; ultra-high performance liquid chromatography-tandem mass spectrometry; comparative analysis