Kinetics of tomato peroxidase inactivation by atmospheric pressure cold plasma based on dielectric barrier discharge

a b s t r a c tA high voltage dielectric barrier discharge plasma reactor using atmospheric air as the inducer gas was studied for the degradation of pesticides (dichlorvos, malathion, endosulfan) in water. The degradation kinetics of the pesticides were studied using GC-MS as a function of plasma control parameters. Electrical characterisation of the plasma revealed that the plasma discharge consisted of filamentary streamers. Excited nitrogen, reactive oxygen species and OH radicals generated in the dielectric barrier discharge (DBD) plasma reactor were identified using optical emission spectroscopy. Ozone, used as an indicator for metastable oxygen species, was quantified within the reactor at concentrations of 1600, 2200, 2800 ppm after 8 min of plasma treatment for applied voltages of 60, 70, and 80 kV respectively. The degradation efficacy of pesticides after 80 kV and 8 min of plasma treatment were found to be 78.98 ± 0.81% for dichlorvos, 69.62 ± 0.14% for malathion and 57.71 ± 0.58% for endosulfan. Degradation was found to follow first order kinetics. GC-MS analyses showed that the degraded compounds and intermediates formed were less toxic than the parent pesticide. A proposed mechanism of degradation of these pesticides is suggested.

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“…Similar observations have been reported by Pankaj et al [55]. The raise in temperature was found to have an insignificant effect (p > 0.05).…”

Section: Quantification Of Pesticide Residues and Degradation Kineticssupporting

confidence: 91%

Pesticide degradation in water using atmospheric air cold plasma

Sarangapani¹,

Misra²,

Milosavljević³

et al. 2016

Journal of Water Process Engineering

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197

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“…We have successfully demonstrated the ability of DBD based in-package NTP in air to inactivate background microflora on strawberries, without inducing significant changes in quality [13]. Recently, our group also demonstrated the inactivation of an enzyme in tomato extract using the same plasma source [14]. We have not found significant changes in the food packaging material following NTP treatments to declare hazards from this process [15,16].…”

Section: Introductionmentioning

confidence: 86%

In-package nonthermal plasma degradation of pesticides on fresh produce

Misra¹,

Pankaj²,

Walsh

et al. 2014

Journal of Hazardous Materials

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138

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Keywords: nonthermal plasma, dielectric barrier discharge, pesticide, GC-MS/MS AbstractIn-package nonthermal plasma (NTP) technology is a novel technology for the decontamination of foods and biological materials. This study presents the first report on the potential of the technology for the degradation of pesticide residues. A cocktail of pesticides, namely Azoxystrobin, Cyprodinil, Fludioxonil and Pyriproxyfen was tested on strawberries. The concentrations of these pesticides were monitored in priori and post-plasma treatment using GC-MS/MS. An applied voltage and time dependent degradation of the pesticides was observed for treatment voltages of 60, 70 and 80 kV and treatment durations ranging from 1 to 5 min, followed by 24 h in-pack storage. The electrical characterisation revealed the operation of the discharge in a stable filamentary regime. The discharge was found to generate reactive oxygen and excited nitrogen species as observed by optical emission spectroscopy.

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“…However, in the direct treatment, in addition to the mentioned RS, the short-lived RSs such as OH˙ and O 2 as well as UV may be related to the enzyme inactivation of ACP. Pankaj et al (2013) studied the effects of treatment time and voltage of the DBD plasma process on the activity of tomato peroxidase (Pankaj et al, 2013). They observed that the enzymatic activity decreased with both treatment time and voltage.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%