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Abstract. The effects of both parathion and methyl parathion on the inhibition of plasma cholinesterase were elaborated in a rat model employing a modified isocratic reverse-phase HPLC method coupled with UV detection for the determination of the urinary metabolite p-nitrophenol (U-4NP). A linearity of r2 0.995 was found for a standard curve ranging from 0.06 to 0.96 g/mL with a % relative error of...
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