title: Isolation of ginkgolides A, B, C, J and bilobalide from G. biloba extracts.
abstract: Ginkgolides A, B, C and J, together with bilobalide, are unique terpenoid components of the Ginkgo biloba tree. Due to similar chemical properties, their separation is quite tedious. We have developed an efficient and rapid protocol for separation of individual ginkgolides and bilobalide from G. biloba extracts. The procedure takes advantage of enhanced susceptibility of ginkgolides B and C to benzylation and the ease of separation of these products from ginkgolides A and J which do not react. The protocol is applicable to the previously reported enriched extracts prepared from G. biloba leaves. A single chromatographic step prior to benzylation provides bilobalide and mixture of ginkgolides A, B, C, and J. After benzylation, the individual ginkgolides are separated by chromatography.
authors.affiliation: Department of Chemistry, Columbia University, 3000 Broadway, NY 10027, USA.
authors.forename: Stanislav
authors.initials: S
authors.lastname: Jaracz
authors.forename: Shahid
authors.initials: S
authors.lastname: Malik
authors.forename: Koji
authors.initials: K
authors.lastname: Nakanishi
mesh_terms: D003517:Cyclopentanes / Q000302:isolation & purification; D004224:Diterpenes / Q000302:isolation & purification*; D005663:Furans / Q000302:isolation & purification; D020441:Ginkgo biloba / Q000737:chemistry*; D046934:Ginkgolides; D007783:Lactones / Q000302:isolation & purification; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*
chemical_list: D003517:Cyclopentanes; D004224:Diterpenes; D005663:Furans; D046934:Ginkgolides; D007783:Lactones; D010936:Plant Extracts; C058295:ginkgolide C; C045856:ginkgolide B; C075228:ginkgolide J; C073710:bilobalide; C477042:ginkgolide A