Effect of cold plasma on degradation of organophosphorus pesticides used on some agricultural products
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Department of Entomology, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Department of Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Department of Organic Chemical, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Sohrab Imani
Department of Entomology, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Submission date: 2016-04-27
Acceptance date: 2017-02-01
Journal of Plant Protection Research 2017;57(1):26–35
This study investigated the potential effect of cold plasma on reducing residues of pesticides diazinon and chlorpyrifos in apples and cucumbers and its effects on property of products. Two separate concentrations of each pesticide with 500 and 1,000 ppm were prepared and the samples were inoculated by dipping them into the solutions. All samples treated with pesticides were exposed to cold plasma in a monopole cold plasma apparatus (DBD) run at 10 and 13 kV voltages. Liquid-liquid extraction (LLE) was used to remove pesticide residues from the samples. Eventually, high-performance liquid chromatography (HPLC) was used to measure the amount of pesticides in the samples. Also, to investigate generated metabolites, extracts were injected into a GC/MS apparatus. In addition, the effects of cold plasma on humidity, tissue hardness, color and the sugar percentage of products were analyzed. The results revealed that treatment of samples with cold plasma considerably reduced pesticide residues without leaving any traces of harmful or toxic substances. Furthermore, it did not have any undesirable effects on the color and texture of the samples. The efficiency of this method increased with higher voltage and longer exposure time. In general, the best results were obtained by the combination of 500 ppm concentration, 10 min exposure and 13 kV voltages. The residues of diazinon were reduced better than the residues of chlorpyrifos. Apples were detoxified much better than cucumbers. Also, cold plasma treatment transformed diazinon and chlorpyrifos pesticides into their less toxic metabolites. The results showed that with increased voltage and longer exposure time, cold plasma caused few changes in moisture and glucose content, texture hardness and color of products. There were no significant difference between treated samples and control in all treatments.
The authors have declared that no conflict of interests exist.
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