RESUMO
Two new flavonol glycosides, 8-methoxyquercetin-3-O-beta-glucosyl-(1'"-2")-O-beta-glucoside and kaempferol-3-O-[2'"-galloyl-O-beta-glucosyl-(1'"-2")-O-beta-glucoside)], together with five known quercetin and kaempferol 3-O-mono-glycosides, were isolated and identified from the aerial parts of Sanguisorba minor Scop. (Rosaceae). All structures were determined by routine methods of analysis and confirmed mostly by negative ESI-MS, 1H- and 13C NMR.
Assuntos
Flavonoides/química , Glucosídeos/química , Glicosídeos/química , Fenóis/química , Polímeros/química , Quercetina/química , Rosaceae/química , Flavonoides/isolamento & purificação , Glucosídeos/isolamento & purificação , Glicosídeos/isolamento & purificação , Indicadores e Reagentes , Espectroscopia de Ressonância Magnética , Fenóis/isolamento & purificação , Extratos Vegetais/química , Polímeros/isolamento & purificação , Quercetina/análogos & derivados , Quercetina/isolamento & purificação , Espectrometria de Massas por Ionização por Electrospray , Espectrofotometria UltravioletaRESUMO
The whole plant of Cotoneaster orbicularis contains the novel di-C-glycosylflavone, 4",4"'-di-O-beta-glucopyranosyl-vicenin II, or 6,8-di-C-beta-Cellobiosylapigenin, as well as the hitherto unknown natural phenolic glucoside, gentisic acid 2-O-beta-glucopyranoside, or orbicularin. Further phenolics are protocatechuic, anisic, caffeic, p-coumaric acids, catechin, epicatechin, 2"-O-alpha-rhamnopyranosylvitexin, vitexin, rutin, isoquercetrin, hyperin and naringenin. All structures were determined by routine methods of analysis and confirmed mostly by 1H- and 13C-NMR.
Assuntos
Flavonoides/isolamento & purificação , Gentisatos , Glucosídeos/isolamento & purificação , Glicosídeos/isolamento & purificação , Hidroxibenzoatos/isolamento & purificação , Fenóis/isolamento & purificação , Rosales/química , Flavonoides/química , Glucosídeos/química , Glicosídeos/química , Hidroxibenzoatos/química , Espectroscopia de Ressonância Magnética , Fenóis/química , Extratos Vegetais/químicaRESUMO
Teucrol, a decarboxy rosmarinic acid and its triglycoside, teucroside, 9'-decarboxyrosmarinic acid-4'-O-alpha-rhamnosyl-(1'''-->6''')-O-beta-galactosyl-(1'''-->4'')-O-alpha-rhamnoside, are two new natural phenolics which have been isolated and identified from the aqueous alcohol extract of the whole plant of Teucrium pilosum (Decne) Asch. & Schweinf. (Lamiaceae). Structures were determined by conventional methods of analysis and confirmed by MS and NMR spectral analysis, including 2D-homonuclear COSY experiment.
Assuntos
Ácidos Cafeicos/isolamento & purificação , Glicosídeos/isolamento & purificação , Lamiaceae/química , Ácidos Cafeicos/química , Glicosídeos/química , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Extratos Vegetais/químicaRESUMO
Two new tri-O-glycoside flavonols: kaempferol and quercetin 3-O-alpha-rhamnopyranosyl(1-->6)-beta-glucopyranosyl(1-->6)-beta- galactopyranosides, were identified from the leaves of Albizia lebbeck. Structures were established by conventional methods of analysis and confirmed by ESI-MS, 1H and 13C-NMR spectral analysis.
Assuntos
Flavonoides , Quempferóis , Folhas de Planta/química , Quercetina/análogos & derivados , Configuração de Carboidratos , Quercetina/química , Quercetina/isolamento & purificação , Análise EspectralRESUMO
From the aerial parts of Ochradenus baccatus, the new flavonoids, quercetin 3-O-beta-glucosyl(1----2)-alpha-rhamnoside-7-O-alpha-rhamnoside and quercetin 3-O-p-coumaryl(1----6)-beta-glucosyl(1----6)-beta-glucoside-7-O-alpha rhamnoside were isolated. The known quercetin glycosides, quercetin 3-gentiobioside, isoquercitrin, quercitrin, together with the known kaempferol glycosides, astragalin and afzelin, were also characterized. The structures were established by conventional methods of analysis and confirmed by spectral analysis.
