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An investigation of the non-solvent-extractable residues of chlorpyrifos-methyl in stored wheat



An investigation of the non-solvent-extractable residues of chlorpyrifos-methyl in stored wheat



Pesticide science1(2): 141-149



The residues of [14C] chlorpyrifos-methyl remaining in wheat after solvent extraction accounted for 28% of the applied dose after an extended period of storage. A bioassay of these residues was carried out using Tribolium castaneum and a significant reduction in the numbers of adults reaching maturity was observed. Attempts to release the non-solvent-extractable residues using an enzymic digestion procedure were unsuccessful, as were several of the chemical solubilisation procedures investigated. A water/methanol extraction system was successful in releasing up to 86% of the radioactivity leaving 10% still non-extractable. Analysis of this solubilised residue revealed that 59% was present as the pyridinol metabolite of chlorpyrifos-methyl and 26% was a polar material composed of two main components. Bioassay tests of these metabolites revealed that the reduction in the number of insects reaching maturity could be associated with the pyridinol metabolite.

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Accession: 002025921

Download citation: RISBibTeXText

DOI: 10.1002/ps.2780310203



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