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NON-THERMAL PLASMA DISINFECTION OF Escherichia coli ON ALMOND

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  056149,  2005 ASAE Annual Meeting . (doi: 10.13031/2013.19589) @2005
Authors:   Shaobo Deng, Roger Ruan, Chul Kyoon Mok, Guangwei Huang, Paul Chen
Keywords:   almond, non-thermal plasma, disinfection, E. coli

This study was done to investigate the applicability of non-thermal plasma (NTP) technology for the disinfection of almond. Almonds were spiked by selected microorganisms with dipping in E. coli culture broth followed by drying. The spiked almonds were treated with NTP at various operating conditions for different duration of treatment. The sterilization pattern of the microorganisms was analyzed. NTP was very effective on disinfection of E. coli on almond, showing almost 5-log reduction after 30 s treatment at 30 kV and 2,000 Hz. The NTP disinfection effect against E. coli on almond increased with the voltage and the frequency. The NTP sterilization of E. coli followed the 1st order reaction kinetics, and the sterilization rate constants varied with almond types and grades. The E. coli cells at logarithmic phase were more sensitive to the NTP than those at stationary and declining phases.

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