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Journal Article 
Pulsed Light inactivation of Listeria innocua on food packaging materials of different surface roughness and reflectivity 
Ringus, DL; Moraru, CI 
Journal of Food Engineering
ISSN: 0260-8774 
Inactivation of Listeria innocua on food packaging
materials by Pulsed Light (PL) treatment was investigated. Coupons of low density polyethylene
(LDPE), high density polyethylene (HOPE), polyethylene-laminated ultra-metalized polyethylene
terephthalate (MET), polyethylene-coated paperboard (TR), and polyethylene-coated aluminum foil
paperboard laminate (EP) were inoculated with L innocua cells in stationary growth phase.
Inoculated courions (similar to 8 CFU/coupon) were treated with Pulsed Light fluence of up to 8.0
J/cm(2), and survivors were determined. Reductions up to 7.2 +/- 0.29, 7.1 +/- 0.06, 4.4 +/-
0.85, 4.5 +/- 1.32, and 3.5 +/- 0.82 log CFU/coupon were obtained on LOPE, HOPE, MET, TR, and EP,
respectively. Inactivation data were used to determine Weibull kinetic parameters and predict
inactivation in a wide range of fluence. Increasing surface reflectivity and surface roughness
appeared to induce lower inactivation, Minimal surface heating was observed for all materials
except MET, on which significant heating occurred. These results demonstrate the potential of
Pulsed Light as an effective method for decontaminating food packaging materials. (C) 2012
Published by Elsevier Ltd. 
Pulsed Light; Listeria innocua; Food packaging; Surface reflectivity; Surface roughness; Surface inactivation; Microbial inactivation; Weibull kinetics