title: Gastric anti-ulcer activity of leaf fractions obtained of polar extract from Wilbrandia ebracteata in mice.
abstract: Leaf fractions of Wilbrandia ebracteata were investigated for anti-ulcerogenic effects in ethanol and indomethacin-induced gastric ulcer assays in mice. Protective anti-ulcer effects were detected only in the ethanol-induced ulcer assay effects after pre-treatment with MeOH extract, MeOH chlorophyll-free, chlorophyll residue, HEX, DCM, aqueous MeOH fraction, ethyl acetate (EtOAc) and aqueous fractions. A potent anti-ulcerogenic effect was determined after pre-treatment of animals with EtOAc fraction, which was fractionated for isolation of active constituents. Seven flavonoids, 3',4',5,6,7,8-hexahydroxyflavonol, orientin, isoorientin, vitexin, isovitexin, luteolin, 6-methoxi-luteolin were isolated from the leaves of W. ebracteata (Cucurbitaceae) by chromatographic methods and identified by their spectral data. The data suggest that flavonoids are active anti-ulcerogenic compounds from leaves of W. ebracteata. The ability of scavenging free radicals was evaluated by DPPH reduction assay by TLC of flavonoids isolated.
authors.affiliation: Departamento de Quimica Organica, Instituto de Quimica de Araraquara, UNESP-Sao Paulo State University, Araraquara, SP, Brazil.
authors.forename: R G
authors.initials: RG
authors.lastname: Coelho
authors.forename: F G
authors.initials: FG
authors.lastname: Gonzalez
authors.forename: M
authors.initials: M
authors.lastname: Sannomiya
authors.forename: L C
authors.initials: LC
authors.lastname: Di Stasi
authors.forename: W
authors.initials: W
authors.lastname: Vilegas
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000897:Anti-Ulcer Agents / Q000494:pharmacology* / Q000627:therapeutic use; D001713:Biphenyl Compounds; D001938:Brazil; D019662:Cucurbitaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology* / Q000627:therapeutic use; D007213:Indomethacin / Q000494:pharmacology; D051379:Mice; D010851:Picrates / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology / Q000627:therapeutic use; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013276:Stomach Ulcer / Q000139:chemically induced / Q000188:drug therapy
chemical_list: D000897:Anti-Ulcer Agents; D001713:Biphenyl Compounds; D005419:Flavonoids; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl; D007213:Indomethacin