Determination of multipesticide residues in Mentha piperita

Abstract A general multiresidue method cannot be applied unconditionally to all medicinal plants to extract the residues of interest. The main objective here was to evaluate the Association of Official Analytical Chemists (AOAC) official method 985.22 with Mentha piperita. L. samples. This AOAC method is one of the methods used in pesticide residue labs worldwide. The proposed method proved to show adequate recovery, repeatability, and reproducibility for most of the studied pesticides, and no cleanup step was needed. More than one pesticide residue was contaminating the tested M. piperita. samples, and the number of pesticides found reflects the diversity of compounds used.