title: Two oleananes from Ammannia auriculata Willd.
abstract: Two new compounds: 3-β,15-α,23,28-tetrahydroxyolean-12-en-3-O-arabinopyaranoside and 3-β,23,28-trihydroxy-olean-12-en-3-O-β-D-glucopyranoside were isolated from the aerial parts of Ammania auriculata along with the known compounds kaempferol, β-sitosterol-3-O-β- D-glucoside, 2-α,3-β,23-trihydroxyolean-12-en-28-oic acid-28-O-β-D-glucopyranoside, quercetin, kaempferol-3-O-α-L-arabinofuranoside, kaempferol-3-O-β-D-xylopyranoside and ellagic acid. Structures of these compounds were elucidated on the basis of their spectroscopic data (NMR, UV, MS and IR spectra). The antioxidant activities of the total extract, the fractions CH(2)Cl(2), EtOAc and the remaining aqueous together with the compounds 1, 6 and 9 were comparable with that of the standard antioxidant, ascorbic acid.
authors.affiliation: Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt. ahmedgohar99@yahoo.com
authors.forename: A A
authors.initials: AA
authors.lastname: Gohar
authors.forename: G T
authors.initials: GT
authors.lastname: Maatooq
authors.forename: E M
authors.initials: EM
authors.lastname: Mrawan
authors.forename: A A
authors.initials: AA
authors.lastname: Zaki
authors.forename: Y
authors.initials: Y
authors.lastname: Takaya
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry; D029561:Lythraceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D000975:Antioxidants; D005419:Flavonoids; C413246:oleanane; D009828:Oleanolic Acid