Study on the Chemical Component of E8 Fraction from Pu-erh Tea

The chemical components of E8 fraction of ethyl acetate extract from Pu-erh tea was analyzed by HPLC preparative chromatography and its chemical structure was also identified by LC-MS and NMR.Results showed that five compounds were identified as follows:3',4',5-Trihydroxy-7-Methoxyflavone,3',4',5,7-Tetrahydroxyflavone(Luteolin) ,Quercetin-3-O-β-D-glucopyranoside,3',4',7-Trihydroxy-5-methoxyflavone-7-O-β-D-glucopyranoside and 3',4',7-Trihydroxy-5-Methoxyflavone.