Vol. 11, No.2, pp.161-164 (2018)

Destruction of Two Pathogenic Bacteria that Transmitted via Food by Nonthermal Plasma

R. Abbaszadeh1, A. Shariati1, M. Zandi1, and H. Ghomi2

1Department of Agriculture, Iranian Research Organization for Science and Technology (IROST), Iran
2Laser and Plasma Research Institute, Shahid Beheshti University, Iran

Abstract

The importance of the food decontamination and the limitations of sterilization method have increased the need for new approaches to inactivate hazardous bacteria that transmitted via food. Cold plasma as a nonthermal technique was investigated here, to deactivate Salmonella enteric and Listeria monocytogenes. To apply plasma treatments, dielectric barrier discharge (DBD) was implemented. Exposure times were 15, 30, 60 and 120 seconds. The results showed that plasma application had lethal effect on two bacteria’s under study and increase in exposure time to a certain extent, improved its sterilization influence. It seems gram positive L. monocytogenes were more sensitive to DBD plasma application than gram negative Salmonella enteric cells. The different effects may be related to cell wall structure and DNA damage. This study demonstrated the antibacterial potential of DBD plasma for using in food industry as a cost-effective technology.

Keywords - Nonthermal plasma, bacteria, food, decontamination, dielectric barrier discharge

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