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Microbial Decontamination of Dishwashing Tools by Corona Discharge Plasma Jet

산업식품공학 2020년 24권 4호 p.225 ~ 229
김민수, 이태훈, Puligundla Pradeep, 목철균,
소속 상세정보
김민수 ( Kim Min-Soo ) - Gachon University Department of Food Science and Biotechnology
이태훈 ( Lee Tae-Hoon ) - Gachon University Department of Food Science and Biotechnology
 ( Puligundla Pradeep ) - Gachon University Department of Food Science and Biotechnology
목철균 ( Mok Chul-Kyoon ) - Gachon University Department of Food Science and Biotechnology

Abstract


Dishwashing tools such as sponges, scourers, and dishcloths are known to harbor dense and diverse microbial communities, including pathogenic bacteria. In this study, the potential of corona discharge plasma jet (CDPJ) as a disinfectant was tested to improve the hygienic quality of dishwashing tools. For the simulation of microbial contamination, selective pathogenic bacteria (Escherichia coli O157:H7, Staphylococcus aureus, and Pseudomonas putida) were inoculated on selected dishwashing tools (dishcloth, sponge, and scourer) at concentrations of 6.55 to 8.77 log CFU/cm 2 . CDPJ generated at 20 kV voltage and 1.5A current was used for decontamination, whereas a sample-to-electrode distance of 25 mm was maintained during the treatment. Following CDPJ treatment for 5 min, the viable counts of E. coli O157:H7, S. aureus, and P. putida were reduced by 4.30-4.56, 3.71-4.78, and 3.50-3.83 log, respectively. The rates of inactivation were varied among the pathogens, decreasing in the order E. coli O157:H7 > S. aureus > P. putida. Among tested kinetic models, namely log-linear, log-linear with shoulder, and Weibull models, the log-linear with shoulder model was found to be the most suitable model to explain the CDPJ inactivation of the pathogens. In conclusion, CDPJ can be used as a potential sanitizing agent for dishwashing tools.

키워드

corona discharge plasma; dishwashing tool; decontamination; kinetic modeling

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