Published online by Cambridge University Press: 19 September 2011
Crude fractions of aerial parts of Andrographis paniculata (Burm.f.) (Acanthaceae) were evaluated for antifeedant, growth-inhibitory and oviposition-deterrent activity against larval and adult stages of the Bihar hairy caterpillar, Spilarctia obliqua (Arctiidae). The methanol fraction had the highest growth-inhibitory activity. Further fractionation resulted in nine sub-fractions of which the most active, identified as the diterpene andrographolide, displayed significant growth-inhibitory and antifeedant properties with GI50 and FD50 values of 100.4 and 159.7 μg/g diet respectively. The ethyl acetate fraction possessed the highest oviposition-deterrent activity.
Des fractions brutes des parties aériennes de Andrographis paniculata (Burm.f.) (Acanthaceae), étaient évaluées pour leur pouvoir anorexigène, leur effet inhibiteur de croissance et leur activité de dissuasion de ponte, contre les stades larvaires et adultes de Spilarctia obliqua (Arctiidae). L'extrait au methanol avait une grande activité inhibitrice de croissance. Des fractionnements plus poussés ont débouché sur neuf sous-fractions dont la plus active identifiée comme l'andrographolide diterpénique montrait plus de pouvoir inhibiteur de croissance (GI) et des propriétés anorexigènes (FD) avec des valeurs respectives GI50 de 100,4 et PD50 de 159,7 μg/gr aliment. La fraction à l'éthyle-acétate possédait le pouvoir le plus élevé de dissuasion de ponte.
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