Metabolism
After exposure, OP pesticides may be metabolized to their more toxic oxon form, which can react with AChE, releasing its pesticide-specific metabolite. If the bound AChE ages, that is, if the adducted pesticide loses its carbon sidechains, the AChE becomes irreversibly bound, which is most often the case. If an OP pesticide does not bind to AChE, it may be enzymatically hydrolyzed through paraoxonase (PON), or spontaneously hydrolyzed to form pesticide-specific metabolites and non-specific diaklyphosphate (DAP) metabolites. These metabolites or their glucuronide- or sulfate-bound conjugates are excreted primarily in the urine. The half-life of OP pesticides in the body varies for each pesticide but is in the range of 24–48 h. A small portion of some of these pesticides is also believed to be sequestered in lipid stores of the body (Bakke and Price, 1976).
MetabolismAfter exposure, OP pesticides may be metabolized to their more toxic oxon form, which can react with AChE, releasing its pesticide-specific metabolite. If the bound AChE ages, that is, if the adducted pesticide loses its carbon sidechains, the AChE becomes irreversibly bound, which is most often the case. If an OP pesticide does not bind to AChE, it may be enzymatically hydrolyzed through paraoxonase (PON), or spontaneously hydrolyzed to form pesticide-specific metabolites and non-specific diaklyphosphate (DAP) metabolites. These metabolites or their glucuronide- or sulfate-bound conjugates are excreted primarily in the urine. The half-life of OP pesticides in the body varies for each pesticide but is in the range of 24–48 h. A small portion of some of these pesticides is also believed to be sequestered in lipid stores of the body (Bakke and Price, 1976).
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