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Afterglow corona discharge air plasma (ACDAP) for inactivation of common food-borne pathogens
- Mok, Chulkyoon, Lee, Taehoon, Puligundla, Pradeep
- Food research international 2015 v.69 pp. 418-423
- Bacillus cereus, Escherichia coli O157, Listeria monocytogenes, Salmonella Typhimurium, Staphylococcus aureus, Vibrio parahaemolyticus, air, air flow, atmospheric pressure, cell viability, cold, decontamination, electrodes, food pathogens, models, relative humidity, temperature
- Atmospheric pressure cold plasma technology is becoming increasingly popular for microbiological decontamination of food and bio-materials. In the present study, afterglow corona discharge air plasma (ACDAP) was used for the inactivation of most common food-borne pathogens, namely pathogenic Escherichia coli, Staphylococcus aureus, Salmonella typhimurium, Bacillus cereus, Listeria monocytogenes, and Vibrio parahaemolyticus. Corona discharge plasma was generated at an output voltage of 20kVDC, and a frequency of 58kHz. And, a centrifugal blower that provides an airflow velocity of 2.5m/s at electrode tip level was used for generating the flowing afterglow of the plasma. During plasma exposure, about 20°C rise in temperature and a 50% decrease in relative humidity were observed in a treatment chamber within 3h of exposure. Upon ACDAP exposure, as high as 3.5-log (99.97%) reduction in viable cell counts of tested food pathogens, especially E. coli O157:H7, was observed over a 24-hour exposure. The pathogen inactivation pattern was better explained by using the Singh–Heldman model, which belongs to pseudo-first-order kinetics. In conclusion, ACDAP was shown to be effective for the inactivation of common food-borne pathogens.