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Pakistan Journal of Biological Sciences
Year: 2000  |  Volume: 3  |  Issue: 3  |  Page No.: 515 - 518

Absorption, Movement and Metabolism of 14C-cyfluthrin in Cotton Leaves

A. Lodhi, N.N. Malik and F. Azam    

Abstract: A greenhouse experiment was conducted to study the uptake and metabolism in cotton leaves of 14C-labelled cyfluthrin, (C22H18Cl2FNO3, active ingredient of Baythroid insecticide). The labelled chemical was sprayed onto the selected portions of leaves which were subsequently studied for the movement (using autoradiography) and recovery of 14C (using extraction, purification procedures). Autoradiography showed a fairly rapid movement of 14C in the leaf tissues through vascular tissues. Movement was more efficient when application was made on the mid-rib region. Dissipation of 14C was also fast and even after 2 days, >60 percent of it was unaccounted. Subsequently, however, the losses were slow and amounted to 70.6 percent after 35 days. Thin layer chromatography/co-chromatography of organic extracts followed by linear scanning revealed that >60 percent of the 14C was still present as parent compound. Partial hydrolysis of cyfluthrin was found to be the main process involved in degradation that resulted in two major degradation products or metabolites.

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