Bacterial inactivation using pulsed light

Type Article
Date 2007-09
Language English
Author(s) Elmnasser Noura1, 2, Ritz Magali2, Leroi Francoise4, Orange Nicole3, Bakhrouf Amina1, Federighi Michel2
Affiliation(s) 1 : Fac Pharm Monastir, Lab Anal Treatment Valorisat Pollutants Environm, TR-5000 Monastir, TuNISIE.
2 : Ecole Natl Vet, INRA, ENVN, SECALIM,UMR 1014, F-40706 Nantes, France.
3 : Univ Rouen, UPRESS 2123, Lab Microbiol Froid, F-27000 Evreux, France.
4 : IFREMER, Ctr Nantes, Dept Sci & Tech Alimentary Marines, F-44311 Nantes, France.
Source Acta Alimentaria (0139-3006) (Akadémiai Kiadó), 2007-09 , Vol. 36 , N. 3 , P. 373-380
DOI 10.1556/AAlim.36.2007.3.9
WOS© Times Cited 7
Keyword(s) Efficiency, Inactivation, Bacteria, Treatment, Pulsed light
Abstract Pulsed light is a new method intended for the decontamination of food surfaces using short, high frequency pulses of an intense broad spectrum. The effects of broad spectrum pulsed light on the survival of Listeria monocytogenes Scott A, Listeria monocytogenes CNL, Pseudomonas fluorescens MF37 and Photobacterium phosphoreum SF680 populations on agar and in a liquid medium were investigated during this study. The sterilisation system generated 1.5 J cm(-2) per pulse with eight lamps for 300 mu s. In the case of surface-seeded cells, a 7.8, 8.14 and > 7.14 log reduction was obtained for L. monocytogenes, Ps. fluorescens MF37 and Ph. phosphoreum, respectively, after a single pulse of treatment. Inactivation levels were lower for depth-plated cells: indeed, 10 pulses of treatment achieved 1.6, 2.03 and 4.78 log reductions for L. monocylogenes ScottA, L. monocytogenes CN-L and Ps. fluorescens MF37, respectively. After 5 pulses, Ph. phosphoreum exhibited a 4.6 log reduction. Similarly, bacterial cells in suspension treated with 3 pulses were reduced by 0.52, 0.8, 2.07 and 2.05 for L. monocytogenes ScottA, L. monocytogenes CNL, Ps. fluorescens MF37 and Ph. phosphoreum, respectively. No resistance to pulsed light was observed during our experiments.
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