title: Chromatographic profiles and identification of new phenolic components of Ginkgo biloba leaves and selected products.
abstract: Ginkgo biloba leaves and their extracts are one of the most widely used herbal products and/or dietary supplements in the world. A systematic study of the phenolic compounds is necessary to establish quality parameters. A modified LC-DAD-ESI/MS method was used to obtain chromatographic profiles for the flavonoids and terpene lactones of Ginkgo biloba leaves. The method was used to identify 45 glycosylated flavonols and flavones, 3 flavonol aglycones, catechin, 10 biflavones, a dihydroxybenzoic acid, and 4 terpene lactones in an aqueous methanol extract of the leaves. The extracted G. biloba leaf products contained the same flavonoids as the raw leaves except for the lack of biflavones. The detected glycosylated flavonol contents were equal to or more than 0.0008% of the dry plant material. This is the first report of the presence of more than 20 of these flavonoids in G. biloba.
authors.affiliation: Food Composition and Methods Development Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705, USA. longze.lin@ars.usda.gov
authors.forename: Long-Ze
authors.initials: LZ
authors.lastname: Lin
authors.forename: Pei
authors.initials: P
authors.lastname: Chen
authors.forename: Mustafa
authors.initials: M
authors.lastname: Ozcan
authors.forename: James M
authors.initials: JM
authors.lastname: Harnly
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis; D020441:Ginkgo biloba / Q000737:chemistry*; D007783:Lactones / Q000032:analysis; D010636:Phenols / Q000032:analysis*; D018515:Plant Leaves / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013729:Terpenes / Q000032:analysis
chemical_list: D005419:Flavonoids; D007783:Lactones; D010636:Phenols; D013729:Terpenes