title: Isoswertiajaponin 2''-O-beta-arabinopyranoside and other flavone-C-glycosides from the Antarctic grass Deschampsia antarctica.
abstract: The major falvonoid constituents of the Antarctic grass, Deschampsia antarctica, are shown to be the C-glycosylfavones, isoswertiajaponin (7-O-methylorientin) 2''-O-beta-arabinopyranoside and orientin. These are accompanied by lower levels of orientin 2''-O-arabinopyranoside, isoswertisin (7-O-methylvitexin) 2''-O-beta-arabinopyranoside, acylated derivatives, isoswertisin, isoswertiajaponin and tricin. A preliminary study suggests that the overall level of flavonoids in Deschampsia increases during the Antarctic mid-summer.
authors.affiliation: Industrial Research Ltd., Lower Hutt, New Zealand.
authors.forename: R F
authors.initials: RF
authors.lastname: Webby
authors.forename: K R
authors.initials: KR
authors.lastname: Markham
mesh_terms: D000864:Antarctic Regions; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D006109:Poaceae / Q000737:chemistry* / Q000378:metabolism; D012621:Seasons; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005419:Flavonoids; D006027:Glycosides; C090074:isoswertiajaponin 2''-O-arabinopyranoside