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Nature and bioavailability of nonextractable (bound) residues in stored wheat treated with chlorpyrifos-methyl


Nature and bioavailability of nonextractable (bound) residues in stored wheat treated with chlorpyrifos-methyl



Journal of Agricultural and Food Chemistry 41(12): 2421-2425



ISSN/ISBN: 0021-8561

DOI: 10.1021/jf00036a039

Wheat treated with chlorpyrifos-methyl [O,O-dimethyl O-[(3,5,6-trichloro-2-pyridyl) phosphorothioate] and stored for 28 months at 20 degrees C contained about 70% of the applied insecticide as nonextractable (bound) residue mainly in the form of parent compound. The stored wheat containing bound chlorpyrifos-methyl was fed to rats. The bound residue in wheat was released and metabolized predominantly by hydrolysis, as indicated by the presence of a major metabolite, 3,5,6-trichloro-2-pyridinol, in urine and feces. The major route of elimination was via urine, which contained 3,5,6-trichloro-2-pyridinol and O-methyl O-(3,5,6-trichloro-2-pyridyl) phosphorothioate. The acetone-extractable portion of feces contained both chlorpyrifos-methyl and 3,5,6-trichloro-2-pyridinol, whereas the nonextractable portion of feces contained only chlorpyrifos-methyl. The results show that bound residues of chlorpyrifos-methyl in stored wheat, which cannot be extracted by methods commonly used in residue analysis of grain, are highly bioavailable.

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Accession: 002659685

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Related references

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