Studies On Chemical Constituents & Analytical Methods Of Effective Constituents Of Ginkgo Leaves

From Ginkgo biloba leaves, collected in Jiangsu, China, sixteen compounds were isolated and their structures were elucidated on the basis of chemical and spectral results. The sixteen compounds were identified as (1) ginkgolide A (2)ginkgolide B, (3)ginkgolide C, (4)kaempferol, (5)quercetin, (6)rutin, (7)sitosterol, (8)bilobetin, (9)ginkgetin, (10)sciadopitysin, (11)isoginkgetin, (12)isorhamnetin, (13)kaempferol-3-O-rhamnoside, (14)3, 5, 7, 4 -tetrahydroxy-flavanone, (15)3, 3 -dimethoxy-4,4 -dihydroxy-stilbene, (16)10, 16-dihydroxyhexadecanoic acid. The latter four compounds were found for the first time from Ginkgo biloba leaves.Two reverse phase high performance liquid chromatographic methods were developed to determine six flavonoids and three ginkgolides,...