Inactivation kinetics and factors of variability in the pulsed light treatment of Listeria innocua cells - (Journal of Food Protection®)
November 21, 2007 – 8:00 pmABSTRACT: Pulsed light (PL) treatment can effectively reduce microbial populations in clear substrates and on surfaces, but its effectiveness varies as a function of substrate or treatment-related factors. For PL to be successfully adopted by the food industry, all factors of influence, as well as the inactivation kinetics for the microorganisms of concern, must be elucidated. In this study, the inactivation kinetics of Listeria innocua and the effect of inoculum size on PL inactivation were investigated. Stainless steel coupons (50.8 by 101.6 mm) of defined surface properties and transparent glass chamber slides (25.4 by 50.8 by 10 mm) were each inoculated with 1 ml of aqueous suspensions of L. innocua containing inoculum populations of up to 109 CFU. The thickness of the liquid layer in the glass slides was 1.16 mm.
The inoculated substrates were exposed to PL treatment of up to 17 J/cm2 in a static PL chamber equipped […]
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