background: organophosphorus (op) compounds are used to control pests, however they can reach the food chain and enter the human body causing serious health problems by means of acetylcholinesterase (ache) inhibition and oxidative stress (os). among the ops, chlorpyrifos (chp), malathion (mal), and diazinon (dia) are commonly used for commercial extermination purposes, in addition to veterinary...