RESUMO
Chemical investigation of polar fractions of the methanol extract of the fruits of Diploclisia glaucescens of the family Menispermaceae furnished two new phenyl glycosides, 4-(2-nitroethyl)phenyl-beta-D-xylopyranosyl-(l approximately 6)-beta-D-glucopyranoside, and 4-cyanophenyl-beta-D-xylopyranosyl-(l approximately 6)-beta-D-glucopyranoside.
Assuntos
Glicosídeos/farmacologia , Menispermaceae/química , Sequência de Carboidratos , Cromatografia Líquida de Alta Pressão , Cromatografia em Camada Fina , Frutas/química , Espectroscopia de Ressonância Magnética , Dados de Sequência Molecular , Extratos Vegetais/química , Espectrofotometria Infravermelho , Espectrofotometria UltravioletaRESUMO
Chemical investigation of the dichloromethane extract of the leaves of Syzygium jambos furnished three dihydrochalcones, phloretin 4'-O-methyl ether (2',6'-dihydroxy-4'-methoxydihydrochalcone) (1), myrigalone G (2',6'-dihydroxy-4'-methoxy-3'-methyldihydrochalcone) (2), and myrigalone B (2',6'-dihydroxy-4'-methoxy-3,5'-dimethyldihydrochalcone) (3) with radical scavenging properties towards the DPPH radical by spectrophotometric method.
Assuntos
Chalconas/química , Chalconas/farmacologia , Sequestradores de Radicais Livres/química , Sequestradores de Radicais Livres/farmacologia , Floretina/análogos & derivados , Syzygium/química , Estrutura Molecular , Floretina/química , Floretina/farmacologia , Folhas de Planta/químicaRESUMO
Chemical investigation of methanol extract of the fruits of Diploclisia glaucescens furnished 3-O-beta-D-glucopyranosyl-20-hydroxyecdysone, 3-O-[beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl]serjanic acid 28-O-beta-D-glucopyranosyl ester and 3-O-[beta-xylopyranosyl(1-->2)-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl]serjanic acid 28-O-beta-D-glucopyranosyl ester. The latter saponin was found to be a new natural product while the other two are reported for the first time from the family Menispermaceae.
Assuntos
Menispermaceae/química , Saponinas/química , Saponinas/isolamento & purificação , Frutas/química , Extratos Vegetais/análiseRESUMO
Complete 1H and 13C NMR assignments are described for two known oleanane glycosides, 3-O-beta-D-glucopyranosyl(1-->3)-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyloleanolic acid and 3-O-beta-D-xylopyranosyl(1-->2)-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyl oleanolic acid isolated from the methanol extract of the leaves of Diploclisia glaucescens.
Assuntos
Glicosídeos/isolamento & purificação , Menispermaceae/química , Folhas de Planta/química , Triterpenos/química , Glicosídeos/química , Medicina Tradicional , Ácido Oleanólico/análogos & derivados , Sri LankaRESUMO
Ninety solvent extracts (n-hexane, dichloromethane and methanol) obtained from the leaves, bark and stem of 13 Sri Lankan Rubiaceae and two Sri Lankan Meliaceae plants have been screened for antibacterial and antifungal activities. Morinda tinctoria, Mussaenda frondosa, Psychotria gardneri and Psychotria stenophylla displayed the widest spectrum of antibacterial activity.
Assuntos
Anti-Infecciosos/farmacologia , Meliaceae/química , Rubiaceae/química , Anti-Infecciosos/isolamento & purificação , Medicina Tradicional , Testes de Sensibilidade Microbiana , Sri LankaRESUMO
Antifungal activity-guided fractionation of the n-butanol extract from the methanol extract of the stem bark of Artocarpus nobilis furnished two stilbene derivatives (E)-4-isopentenyl-3,5,2',4'-tetrahydroxystilbene and (E)-4-(3-methyl-E-but-1-enyl)-3,5,2',4'-tetrahydroxystilbene. Both compounds showed strong antifungal activity against Cladosporium cladosporioides and high radical scavenging activity towards the DPPH radical in TLC bio-autography method.
Assuntos
Antifúngicos/farmacologia , Artocarpus , Cladosporium/efeitos dos fármacos , Sequestradores de Radicais Livres/farmacologia , Fitoterapia , Extratos Vegetais/farmacologia , Antifúngicos/administração & dosagem , Antifúngicos/uso terapêutico , Compostos de Bifenilo , Sequestradores de Radicais Livres/administração & dosagem , Sequestradores de Radicais Livres/uso terapêutico , Humanos , Testes de Sensibilidade Microbiana , Picratos/química , Casca de Planta , Extratos Vegetais/administração & dosagem , Extratos Vegetais/uso terapêutico , Estilbenos/administração & dosagem , Estilbenos/farmacologia , Estilbenos/uso terapêuticoRESUMO
Twenty nine solvent extracts from twenty Sri Lankan plants were examined for antifeedant activity against the fourth instar larvae of Mexican bean beetle, Epilachna varivestis Muls., Coccinellidae. Extracts of Sarcococca brevifolia (Buxaceae), Strychnus nux vomica (Loganiaceae), Diploclisia glaucescens, Coscinium fenestratum (Menispermaceae), Syzygium caryophyllatum (Myrtaceae), Pittosporium zeylanicum (Pittosporaceae), Lasianthus gardneri (Rubiaceae), Ferronia limonia (Rutaceae) and Allophylus cobbe (Sapindaceae) have shown strong antifeedant activity.
Assuntos
Besouros , Inseticidas , Magnoliopsida/química , Extratos Vegetais , Animais , Buxaceae/química , Fabaceae/química , Comportamento Alimentar/efeitos dos fármacos , Inseticidas/isolamento & purificação , Loganiaceae/química , Myrtaceae/química , Rubiaceae/química , Rutaceae/química , Sapindaceae/química , Sri LankaRESUMO
Chemical investigation of n-butanol extract from the methanol extract of leaves of Grewia damine furnished lupeol, sitosterol beta-D-glucoside, flavone C-glycosides vitexin, isovitexin where as the same extracts from the leaves of Filicium decipiens furnished sitosterol beta-D-glucoside, 3-O-beta-D-glucopyranosyl kaempferol, 3-O-beta-D-glucopyranosylquercetin and 3-O-alpha-L-rhamnopyranosyl(1--> 2)-beta-D-glucopyranosylkaempferol.
Assuntos
Glicosídeos/química , Grewia , Fitoterapia , Extratos Vegetais/química , Sapindaceae , Humanos , Espectroscopia de Ressonância Magnética , Folhas de PlantaRESUMO
Nineteen solvent extracts from seven Sri Lankan plants were examined for nematicidal activity against the root knot nematode Meloidogyne incognita. Extracts of Allophyhu cobbe, Lepisanthes tetraphylla (Sapindaceae), Sarcococca zeylanica (Buxaceae) and Hedyotis lawsoniae (Rubiaceae) have shown significant nematicidal activity.
Assuntos
Anti-Helmínticos/farmacologia , Extratos Vegetais/farmacologia , Plantas/química , Tylenchoidea/efeitos dos fármacos , Animais , Anti-Helmínticos/química , Larva/efeitos dos fármacos , Extratos Vegetais/química , Sri LankaRESUMO
Chemical investigation of the n-butanol extract from the methanol extract of the root bark of Artocarpus nobilis furnished four new prenylated flavonoids together with artonin E 2'-methylether (4), isoartonin E 2'-methylether (5), dihydroisoartonin E 2'-methylether (6), artonin V 2'-methylether (7), artobiloxanthone (1), artonin E (2) and cycloartobiloxanthone (3). All these compounds showed strong radical scavenging properties towards DPPH radical.