Studies on the Mode of Action of Fenvalerate Enantiomers : II.Cuticular Penetration, Internal Distribution, Penetration and Absorption into Nerve Tissue and Metabolism of Fenvalerate Enantiomers in the American Cockroach, Periplaneta americana(L.)

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The insecticidal activity, cuticular penetration, internal distribution, penetration and absorption into nerve tissue and metabolism of the pyrethroid insecticide, the R,S-S isomer, (R,S)-α-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)-isovalerate and the R,S-R isomer, (R,S)-α-cyano-3-phenoxybenzyl (R)-2-(4-chlorophenyl)-isovalerate were studied in the American cockroach, Periplaneta americana (L.). Results of toxicity tests showed that the relative potency of the R,S-S isomer is more than 36 times higher than the R,S-R isomer to this insect. The cuticular penetration experiment showed that the R,S-S isomer penetrated more rapidly than the R,S=R isomer. The internal distribution experiment indicated some difference in the time course of the two compounds in the head, nerve cord and hemolymph. Experiments concerning the penetration and absorption into nerve tissue showed that the R,S-S isomer penetrated into nerve tissue more rapidly than the R,S-R isomer. The patterns of the in vivo metabolism of these two optical isomers were similar and there was little quantitative difference between them. From these results, it was apparent that there was some difference in the pharamacodynamics between the R,S-S isomer and the R,S-R isomer in the American cockroach. However, this difference seemed to be minor factor considering the large difference between the bioactivities of these two optical isomers.
日本応用動物昆虫学会の論文
1991-05-25