tailieunhanh - Flavonoids isolated from the flowers of Camellia chrysantha

Camellia chrysantha (Hu) Tuyama (the golden camellia, golden tea) is a species of evergreen shrub or small tree belonging to the family Theaceae. The flowers and the leaves of this plant are used as tea due to their health benefits. | Vietnam Journal of Science and Technology 57 3 2019 287-293 doi 2525-2518 57 3 12721 FLAVONOIDS ISOLATED FROM THE FLOWERS OF CAMELLIA CHRYSANTHA Nguyen Thi Hong Van1 2 Pham Cao Bach1 Cam Thi Inh1 Doan Lan Phuong1 Le Tat Thanh1 Tran Quoc Toan1 Pham Quoc Long1 2 Institute of Natural Products Chemistry Vietnam Academy of Science and Technology VAST 18 Hoang Quoc Viet street Cau Giay Ha Noi 2Graduate University of Sciences and Technology 18 Hoang Quoc Viet Cau Giay Ha Noi Email nguyenthihongvan. Received 21 September 2018 Accepted for publication 2 March 2019 Abstract. Camellia chrysantha Hu Tuyama the golden camellia golden tea is a species of evergreen shrub or small tree belonging to the family Theaceae. The flowers and the leaves of this plant are used as tea due to their health benefits. The aim of this study was to investigate the chemical constituents of the flowers of Camellia chrysantha Hu Tuyama. Five flavonoids were isolated from the flowers of Camellia chrysantha Theaceae including -catechin 1 - -epicatechin 2 quercetin 3 quercetin-3-O-methyl ether 4 and kaempferol 5 . Their chemical structures were elucidated by spectroscopic data analysis and by comparison with those reported in the literature. Among five compounds compound 4 was isolated for the first time from this species. Keywords Camellia chrysantha Hu Tuyama Theaceae catechin epicatechin quercetin quercetin-3-O-methyl ether kaempferol. Classification numbers . 1. INTRODUCTION Camellia chrysantha Hu Tuyama the golden camellia is a species of evergreen shrub or small tree belonging to the family Theaceae and restricted to wet areas of forest below 500 m. It is found in China and Vietnam. In Vietnam this species was found in Ba Che Quang Ninh 1 . It is noticed that Camellia chrysantha contains many trace elements such as germanium selenium manganese molypdenum vanadium and zinc the bioactive compounds found in this species have the ability to inhibit the growth .