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 eff ects
of cold plasma on humidity, tissue hardness, color and the sugar percentage of products
were analyzed. Th e 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.
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