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KMID : 0881720170320030222
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Journal of Food Hygiene and Safety
2017 Volume.32 No. 3 p.222 ~ p.227
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Sterilization of Food-Borne Pathogenic Bacteria by Atmospheric Pressure Dielectric Barrier Discharge Plasma
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Lee Seung-Jae
Song Yoon-Seok
Park Yu-Ri
Ryu Seung-Min
Jeon Hyeong-Won
Eom Sang-Heum
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Abstract
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This study aimed to explore the potential for food-industry application of atmospheric pressure dielectric barrier discharge plasma (atmospheric pressure DBD plasma) as a non-thermal sterilization technology for microorganism. The effects of the key parameters such as power, oxygen ratio, exposure time and distance on Escherichia coli KCCM 21052 sterilization by the atmospheric pressure DBD plasma treatment were investigated. The experimental results revealed that increasing the power, exposure time or oxygen ratio and decreasing the exposure distance led to an improvement in the sterilization efficiency of E. coli. Furthermore, the atmospheric pressure DBD plasma (1.0 kW power, 1.0% (v/v) O2, 5 min exposure time and 20 mm exposure distance) treatment was very effective for the sterilization of food-borne pathogenic bacteria. The sterilization rate of E. coli, Bacillus cereus KCCM 40935, Bacillus subtilis KCCM 12027, Bacillus thuringiensis KCCM 11429 and Bacillus atrophaeus KCCM 11314 were 72.3%, 74.6%, 88.5%, 84.7% and 91.3%, respectively.
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KEYWORD
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Atmospheric Pressure Dielectric Barrier Discharge Plasma , Non-thermal , Non-chemical , Sterilization , Food-borne Pathogenic Bacteria
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