Abstract
The purpose of this study was to identify the combined effect of a 222-nm krypton-chlorine (KrCl) excilamp and a 280-nm light-emitting-diode (LED-UVC) on inactivation of Salmonella Typhimurium and Listeria monocytogenes. Distilled water samples inoculated with pathogens were subjected to KrCl excilamp, LED-UVC, and combined treatment. The combined treatment exhibited an additive and synergistic effect on the inactivation of S. Typhimurium and L. monocytogenes. When recovery of pathogens after treatment was observed, the recovery level was reduced by combining the two treatments. Cell membrane damage was identified, and 75 s combined treatment resulted in significantly higher levels of inactivation than individual treatment in L. monocytogenes. These results indicate that combined treatment with a KrCl excilamp and LED-UVC can be used effectively for the inactivation of foodborne pathogens with reduced cell recovery, and increased cell membrane damage contributes to the additive effect.
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