Title: A model for lactic acid-induced inhibition of Yersinia enterocolitica in mono- and coculture with Lactobacillus sakei
Authors: Vereecken, KM ×
Devlieghere, F
Bockstaele, A
Debevere, J
Van Impe, Jan #
Issue Date: 2003
Series Title: Food microbiology vol:20 issue:6 pages:701-713
Conference: date:Bio TeC Bioproc Technol & Control, Dept Chem Engn, B-3001 Louvain, Belgium; State Univ Ghent, Lab Food Microbiol & Food preservat, Dept Food Technol & Nutr, B-9000 Ghent, Belgium
Abstract: Most traditional predictive models for growth of foodborne pathogenic (or spoilage) organisms focus on single species behaviour. This approach may lead to a significant discrepancy between model predictions and reality, since the (potential) influence of the background flora is neglected. In this paper, a specific type of multiple species interaction is considered, namely, a pathogenic organism in the presence of a microbial antagonist, where the latter species inhibits the pathogen's growth through lactic acid production. As an experimental case study, growth curves of Yersinia enterocolitica in mono- and coculture with Lactobacillus sakei were generated in duplicate in a modified brain heart infusion medium. A complete factorial design was applied to assess the impact of temperature (4 levels) and inoculum, ratio pathogen/antagonist (6 levels) on the Y. enterocolitica growth. Based on a set of formulated model requirements, a novel model was developed, in which the experimentally observed inhibition effect, i.e., an (early) induction of the stationary phase in the pathogen's growth curve, is explicitly related to the lactic acid production curve. Experimental data and model predictions show good agreement. (C) 2003 Elsevier Ltd. All rights reserved.
ISSN: 0740-0020
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Bio- & Chemical Systems Technology, Reactor Engineering and Safety Section
× corresponding author
# (joint) last author

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