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We have developed a screen-printed electrochemical electrode (SPE) for paraoxon based on its inhibitory effect on the enzyme butyrylcholinesterase (BChE). The electrode was first modified by drop casting with a dispersion of carbon black nanoparticles (CBNPs) in a dimethylformamide-water mixture, and BChE was then immobilized on the surface by cross-linking. The resulting biosensor was exposed to...