2.7. Quantification
For clean-up and UHPLC see above. Rutin trihydrate (0.52–
103.7 mg/L, calculated as quercetin), myricitrin (0.99–197.4 mg/L,
calculated as myricetin) and kaempferol-3-rhamnosidoglucoside
(0.96–96.3 mg/L, calculated as kaempferol) were used for calibration
purposes. Tea samples were analyzed with and without addition
of a standard solution containing known amounts of rutin,
myricetin and kaempferol.