关键词: 茶叶, 品种适制性, 黄酮醇糖苷, 葡萄糖苷, 半乳糖苷, 液相色谱-质谱联用

Abstract: The contents of 10 flavonol glycosides in 18 tea varieties were determined using ultra high performance liquid chromatography-quadrupole-time of flight mass spectrometry (UHPLC-QTOF-MS). The ratios of flavonol glycoside to flavonol galactoside were also calculated. The results showed that the glycosylation level of flavonol was higher in tea varieties with processing suitability for black tea when compared with those suitable for green tea processing. Kaempferol-3-glucoside, kaempferol-3-glucosylrutinoside, kaempferol-3-glucoside to kaempferol-3-galactoside ratio, quercetin-3-glucoside to quercetin-3-galactoside ratio, myricetin-3-glucoside to myricetin-3-galactoside ratio were significantly different (P < 0.05) among tea varieties with different processing suitabilities. The significant difference (P < 0.001) in kaempferol-3-glucoside and its ratio to kaempferol-3-galactoside indicates the potential for the discrimination of the processing suitability of tea varieties. The discrimination accuracy of tea varieties for their suitability for processing of green and black tea were 100% and 83%, respectively.

Key words: tea, processing suitability, flavonol glycoside, glucoside, galactoside, LC-MS