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A microplate method is described for the quantification of p-nitrophenol (p-NPh) in urine samples where it can be found after exposure to certain insecticides such as methyl parathion or paraoxon. The assay is based on the use of a polydopamine (PDA) film doped with gold nanoparticles (AuNPs). The latter exerts a catalytic effect on the reduction of nitrophenols by NaBH4. PDA has adhesive properties...
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