title: Further characterization of foliar flavonoids in Crossostephium chinense and their geographic variation.
abstract: Foliar flavonoids of Crossostephium chinense in Japan and Taiwan were isolated and further characterized. Eighteen flavonoid aglycones, luteolin, apigenin, hispidulin, chrysoeriol, 5,7,4'-trihydroxy-6,3',5'-trimethoxyflavone, jaceosidin, cilsimaritin, quercetin 3-methyl ether, axillarin, chrysosplenol-D, cirsiliol, apometzgerin, 5,7,3'-trihydroxy-6,4',5'-trimethoxyflavone, luteolin 3',4'-dimethyl ether, cirsilineol, eupatilin, nepetin and 5,7,3',4'-tetrahydroxy-6,5'-dimethoxyflavone, were identified by UV, 1H and 13C NMR spectroscopic, LC-MS and HPLC comparisons w ith authentic samples. The compounds existed on the leaf surface. Four flavonoid glycosides, quercetin 3,7-di-O-glucoside, quercetin 3-O-rutinoside, luteolin 7-O-glucoside and apigenin 7-O-rutinoside, were also isolated as the intracellular flavonoids. It was shown by HPLC survey that variation of the species' flavonoids occurs among the collection sites.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Uehara
authors.forename: Junichi
authors.initials: J
authors.lastname: Kitajima
authors.forename: Goro
authors.initials: G
authors.lastname: Kokubugata
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Iwashina
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D007564:Japan
chemical_list: D005419:Flavonoids