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Antifeedant activity of Piper guineense Schum & Thonn. Amides against larvae of the sorghum stem borer Chilo partellus (Swinhoe)

Published online by Cambridge University Press:  19 September 2011

Baldwyn Torto
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
Ivan Addae-Mensah
Affiliation:
Department of Chemistry, University of Ghana, Legon, Accra, Ghana
Lambert Moreka
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
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Abstract

Six amide alkaloids of Piper guineense were tested for antifeedant activity against fifth instar larvae of Chilo partellus in choice assays. These amides include piperine, Δα, β-dihydropiperine, wisanine, Δα, β-dihydrowisanine, trichostachine and N-isobutyl-trans-2-trans-4-eicosadienamide. Piperine and its dihydrosaturated derivative exhibited the most potentantifeedant activity. Δα, β-dihydrowisanine and trichostachine were intermediate in activity followed by wisanine. The N-isobutyl derivative was the least active. These results suggest that the presence of a methylenedioxybenzene and an alicyclic amide group in the compound may be crucial for high antifeedant activity.

Résumé

Six amido-alcaloide de Piper guineense étaient testées pour son activité antinutritionelle contre les cinquième-instar larves de Chilo partellus en choix essais. Ces amides compennent piperine, Δα, β-dihydropiperine, wisanine, Δα, β-dihydrowisanine, trichostachine et N-isobutyl-trens-2-trans-4-eicosadienamide. Piperine et son dérivé dihydrosaturé exhibitaient la plus puis santé activité antinutritionelle. Δα, β-dihydrowisanine et trichostachine étaient intermédiates en activité suivi par wisanine. Le dérivé N-isobutyl était le plus actif. Ces résultats suggèrent que la présence d'un methylenedioxybenzene et d'un groupe amide cyclique dans le composé peut-être important pour une haute activitée antinutritionelle.

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Type
Research Articles
Copyright
Copyright © ICIPE 1992

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