Chem. Pharm. Bull., 53(9),1200-1201, September 2005

Notes

Biflavone Glucosides from Ginkgo biloba Yellow Leaves

Sook Kyung HYUN,^a Sam Sik KANG,^b Kun Ho SON,^c Hae Young CHUNG,^d and Jae Sue CHOI^*,a

^a Faculty of Food Science and Biotechnology, Pukyong National University; Busan 608-737, Korea: ^b Natural Products Research Institute & College of Pharmacy, Seoul National University; Seoul 110-460, Korea: ^c Department of Food and Nutrition, Andong National University; Andong 760-749, Korea: and ^d College of Pharmacy, Pusan National University; Busan 609-735, Korea. * To whom correspondence should be addressed. e-mail: choijs@pknu.ac.kr

Phytochemical investigation of Ginkgo biloba (Ginkgoaceae) has resulted in the isolation of two new biflavone glucosides, ginkgetin 7″-O-β-D-glucopyranoside (1) and isoginkgetin 7-O-β-D-glucopyranoside (2). The structures were determined on the basis of chemical and spectroscopic evidences.

Key words Ginkgo biloba; Ginkgoaceae; biflavone glucoside; ginkgetin 7″-O-β-D-glucopyranoside; isoginkgetin 7-O-β-D-glucopyranoside