Study Of The Chemical Composition Of Tea

Camellia sinensis is a plant widely distributed in Jiangsu,Anhui,Zhejiang provinces,etc. It showed the physiological functions such as exciting central nerve system,relaxing blood vessels,diuresis,spasmolysys,relieveing the cough,anti-bacteria,anti-tumour activities and so on.In order to find new active agents from this plant,the chemical study on its constituents was carried out.By means of the chromatography on silica gel,Sephadex LH-20 columns and the recrystallizing methods,twenty-three compounds were isolated and purified. According to the physicochemical properties and the comparision with the data in the references,the structures of twenty compounds were identified as follows:kaempferol(1), quercetin(2),kaempferol-3-O-β-D-glucopyranoside(3),quercetin-3-O-β-D-glucopyranoside (4),kaempferol-3-O-rutinoside(5),rutin(6),quercetin-3-O-α-L-arabinofuranoside(7), n-butyl-O-β-D-fructopyranoside(8),chlorogenic methyl ester(9),uracil(10),gallic acid(11), friedelin(12),caffeine(13),α-spinasterol(14),α-amyrin(15),palmitic acid(16), theobromine(17),β-sitosterol(18),daucosterol(19),3,4-dihydroxybenzoic acid(20). Among them compounds 8,9 and 10 were obtained from the Camellia genus for the first time,compound 7 was obtained from the Camellia sinensis(L.)O.Ktze for the first time.