RESUMO
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
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.
Assuntos
Antioxidantes/isolamento & purificação , Artocarpus/química , Sequestradores de Radicais Livres/isolamento & purificação , Extratos Vegetais/isolamento & purificação , Antioxidantes/química , Antioxidantes/farmacologia , Compostos de Bifenilo , Flavonoides/química , Flavonoides/isolamento & purificação , Flavonoides/farmacologia , Sequestradores de Radicais Livres/química , Sequestradores de Radicais Livres/farmacologia , Hidrazinas , Estrutura Molecular , Picratos , Casca de Planta , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Raízes de PlantasRESUMO
A new seco-ring A lupane triterpene derivative (1), along with lupenone, lupeol, beta-sitosterol, ursolic acid, and stigmasterol 3-O-beta-d-glucoside, were isolated from a methanol extract of mature stems of Lasianthus gardneri, a shrub from the family Rubiaceae growing in Sri Lanka. The structure and stereochemistry of the new compound were determined using a combination of (13)C and (1)H homo- and heteronuclear 2D NMR experiments and from mass spectral data. The structure of 1 was confirmed by partial synthesis from lupeol.