New Mosquito Larvicidal Tetranortriterpenoids from Turraea wakefieldii and Turraea floribunda
Journal of Agricultural and Food Chemistry2004Vol. 52(16), pp. 5027–5031
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Mary Ndung’u, Bakari Kaoneka, Ahmed Hassanali, Wilber Lwande, Antony M. Hooper, Francis S.K. Tayman, Oliver Zerbe, Baldwyn Torto
Abstract
The crude methanol extracts of the root barks of Turraea wakefieldii and Turraea floribunda were found to show mosquito larvicidal activity against third-instar larvae of Anopheles gambiae sensu stricto. Four new limonoids comprising a vilasininoid 1 and three havanensinoids 2-4 were isolated from the chloroform fractions of the methanol extracts of T. wakefieldii and T. floribunda, respectively. The structures of the compounds were elucidated by NMR spectroscopy. Compounds 1, 2, and 4 had LD50 values of 7.1, 4.0, and 3.6 ppm, respectively, and were more potent than azadirachtin, which had an LD50 value of 57.1 ppm when tested against larvae of A. gambiae.
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