Inhibition of Listeria monocytogenes by resident biofilms present on wooden shelves used for cheese ripening
2011
Mariani, C., C. | Oulahal, N., N. | Chamba, J. -F., J. -F. | Dubois-Brissonnet, F., F. | Notz, Eric, E. | Briandet, Romain | MICrobiologie de l'ALImentation au Service de la Santé (MICALIS) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Laboratoire de Recherche en Génie Industriel alimentaire (LRGIA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon | French "Association de Coordination Technique pour l'Industrie Agro-alimentaire" (ACTIA); Syndicat Interprofessionnel de Reblochon; Arilait Recherches; Comite National des Appellations d'Origine Laitieres (CNAOL); Entremont-Alliance; Aerial
The purpose of the present study was to characterize the development of Listeria monocytogenes on wooden shelves used for cheese ripening. The fate of two L monocytogenes strains was analysed over time as a function of the presence of a native biofilm, the farmhouse origin of cheeses, and the wooden shelves properties. In presence of a native microbial flora on the shelves, deposited populations of L monocytogenes remained stable or even decreased by up to 2 log(10)(CFU/cm(2)) after 12 days of incubation at 15 degrees C in all tested conditions. By contrast, L monocytogenes populations increased by up to 4 log(10)(CFU/cm(2)) when the resident biofilm was thermally inactivated, suggesting a microbial origin of the observed inhibitory effect. All together, our results suggest that the biocontrol of pathogens multiplication on wooden shelves by resident biofilms should be considered for the microbiological safety of traditional ripened cheeses. (C) 2011 Elsevier Ltd. All rights reserved.
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