title: Constituents with radical scavenging effect from Opuntia dillenii: structures of new alpha-pyrones and flavonol glycoside.
abstract: The aqueous ethanolic extract from the fresh stems of Opuntia dillenii HAW. showed potent radical scanvenging activity. Three new compounds, opuntioside I, 4-ethoxyl-6-hydroxymethyl-alpha-pyrone, and kaempferol 7-O-beta-D-glucopyranosyl-(1-->4)-beta-D-glucopyranoside, were isolated from the extract. The structures of the new compounds were determined on the basis of chemical and physicochemical evidence and the radical scavenging effects of principal constituents were examined.
authors.affiliation: Shenyang Pharmaceutical University, China.
authors.forename: Yingkun
authors.initials: Y
authors.lastname: Qiu
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Chen
authors.forename: Yupin
authors.initials: Y
authors.lastname: Pei
authors.forename: Hisashi
authors.initials: H
authors.lastname: Matsuda
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D044948:Flavonols; D016166:Free Radical Scavengers / Q000737:chemistry* / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D029747:Opuntia / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018547:Plant Stems / Q000737:chemistry; D011753:Pyrones / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D005419:Flavonoids; D044948:Flavonols; D016166:Free Radical Scavengers; D006027:Glycosides; D010936:Plant Extracts; D011753:Pyrones