[Chemical constitutes of flavones from Pu-erh tea]

The chemical constituents in the Pu-erh tea were isolated by various column chromatographic methods, and their structures were identified by spectral data and physic-chemical analysis. As a result, eleven flavonoids were isolated and identified as kaempferol (1), quercetin (2), kaempferol-3-O-beta-D-glucopyranoside (3), kaempferol-3-O-beta-D-rutinoside (4), apigenin-6-C-alpha-L-arabinopyranosyl-8-C-beta-D-glucopyranoside (5), vitexin-4"-O-beta-D-glucopyranoside (6), kaempferol-3-O-[alpha-L-rhamnopyranosyl-(1--> 3)-alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranoside] (7), quercetin3-O-beta-D-glucopyranoside (8), rutin (9), quercetin-3-0-alpha-L-rhamnopyranoside (10), and myricetin-3-0-beta-D-glucopyranoside (11). Compounds 5-7, 10 and 11 were isolated from Pu-erh tea for the first time.