Degradation of Cypermethrin and Dicofol Pesticides Residue in Dried Basil Leave by Gaseous Ozone Fumigation

Abstract

This research aims to apply gaseous ozone to degrade pesticides (cypermethrin and dicofol) residues in dried basil leaves and to investigate their qualities after fumigation. Sweet basil, holy basil, hairy basil, and tree basil were fumigated with 200 mg/L gaseous ozone. The result showed that half-life of cypermethrin and dicofol in dried basil under ozone fumigation were in the range of 13.1–31.6 and 9.4–18.9 min, respectively. Ozone fumigation exhibited at least 99.9% reduction of pesticide residue in comparison with self-degradation. In addition, this process does not significantly affect phenolic compounds and antioxidants in dried basil at 95% confidence level.