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Design of challenge testing experiments to assess the variability of Listeria monocytogenes growth in foods

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The assessment of the evolution of micro-organisms naturally contaminating food must take into account the variability of biological factors, food characteristics and storage conditions. A research project involving eight French laboratories was conducted to quantify the variability of growth parameters of Listeria monocytogenes obtained by challenge testing in five food products. The residual variability corresponded to a coefficient of variation (CV) of approximately 20% for the growth rate (μmax) and 130% for the parameter K = μmax × lag.
2011

Validation d'une approche stochastique de modélisation pour la croissance de Listeria monocytogenes dans les aliments réfrigérés

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A stochastic modelling approach was developed to describe the distribution of Listeria monocytogenes contamination in foods throughout their shelf life.
2010

Adjusting the control parameters of the diced bacon process according to food safety targets for Listeria monocytogenes

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PDF icon Adjusting the control parameters of the diced bacon process according to food safety targets for Listeria monocytogenes
2010

Modeling microbial competition in food: Application to the behavior of Listeria monocytogenes and lactic acid flora in pork meat products

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Competition between background microflora and microbial pathogens raises questions about the application of predictive microbiology in situ, i.e., in non-sterile naturally contaminated foods. In this article, we present a review of the models developed in predictive microbiology to describe interactions between microflora in foods, with a special focus on two approaches: one based on the Jameson effect (simultaneous deceleration of all microbial populations) and one based on the Lotka–Volterra competition model.
2010

Quantification des effets de facteurs lors de la réalisation de tests de croissance aliments sur l’estimation du taux de croissance de Listeria monocytogenes

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Le test de croissance (ou challenge-test) permet d’évaluer le comportement de bactéries pathogènes inoculées artificiellement dans les aliments dans des conditions définies. Il permet également de valider les modèles de microbiologie prévisionnelle. Le protocole de mise en oeuvre du test de croissance est déterminé en fonction de son objectif. Cependant, différents facteurs influencent les résultats de ces tests, en particulier pour des aliments complexes, tels que des sandwiches ou des salades mélangées.

PDF icon Quantification des effets de facteurs lors de la réalisation de tests de croissance aliments sur l’estimation du taux de croissance de Listeria monocytogenes
2010

Design of challenge testing experiments to assess the variability of Listeria monocytogenes growth in foods

Consulter le resumé

The assessment of the evolution of micro-organisms naturally contaminating food must take into account the variability of biological factors, food characteristics and storage conditions. A research project involving eight French laboratories was conducted to quantify the variability of growth parameters of Listeria monocytogenes obtained by challenge testing in five food products. The residual variability corresponded to a coefficient of variation (CV) of approximately 20% for the growth rate (μmax) and 130% for the parameter K = μmax × lag.
2010

Growth potential of Listeria monocytogenes in salted diced bacon

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The aim of this study was to implement challenge-tests assessing growth potential of Listeria monocytogenes (L. m) during storage of salted diced bacon, a 35 day shelf-life product. The challenge-tests were performed on 3 different batches (3 repetitions per batch) with a mixture of 3 strains of L. m. For the preparation of the inoculum, the first subculture was made at optimal conditions and the second one was made taking into account NaCl content and cold stresses. The initial targeted level of L. m was 10 cfu/g and the test units were stored at 4°C/12 days, then at 8°C/26 days.

PDF icon Growth potential of Listeria monocytogenes in salted diced bacon
2010

Quantification of the effect of factors involved in challenge-test assays on the growth rate estimation of Listeria monocytogenes.<br /><br /><br /><br /><br />Quantification des effets de facteurs lors de la réalisation de tests de croissance aliments sur l’estimation du taux de croissance de Listeria monocytogenes.

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Direct evaluation of growth of artificially inoculated bacterial pathogens in foods using challenge-tests is an interesting tool for the management of food safety.

However, an issue is their an issue is their ability to describe the growth of a foodborne pathogen in conditions as similar as possible to a naturally contamined and routinely produced food.
PDF icon Quantification of the effect of factors involved in challenge-test assays on the growth rate estimation of Listeria monocytogenes.<br /><br /><br /><br /><br />Quantification des effets de facteurs lors de la réalisation de tests de croissance aliments sur l’estimation du taux de croissance de Listeria monocytogenes.
2010

Quantification of the effect of factors involved in challenge-test assays on the growth rate estimation of Listeria monocytogenes

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This study describes an original interlaboratory trial relative to food challenge-tests conducted by eight French laboratories. The impact of several factors (linked to the type of foodstuff, to biological parameters and to experimental conditions as well as to the laboratory performing the test) on the growth rate of Listeria monocytogenes was quantified. The major factors influencing the growth rate variability were the "manufacturing origin of the product" and the "localization of the inoculum in food".
PDF icon Quantification of the effect of factors involved in challenge-test assays on the growth rate estimation of Listeria monocytogenes
2009

Design of challenge testing experiments to assess the variability of microbial behaviors in foods

Consulter le resumé

The assessment of the evolution of microorganisms naturally contaminating food must take into account the variability of biological factors, food characteristics and storage conditions. A research project involving eight French laboratories was conducted to quantify the variability of growth parameters of Listeria monocytogenes obtained by challenge testing in five foods. The residual variability corresponded to a coefficient of variation (CV) of approximately 20% for the growth rate (μmax) and 120% for the parameter K (=μmax.lag time).
PDF icon Design of challenge testing experiments to assess the variability of microbial behaviors in foods
2009

Le challenge test ou test d'épreuve microbiologique

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Un test d'épreuve microbiologique (ou challenge test) consiste à introduire des bactéries pathogènes dans un produit et à observer leur croissance, leur stabilisation ou leur décroissance au sein de ce produit. L'objectif d'une telle manipulation est l'étude des risques microbiologiques par rapport à un produit et s'inscrit donc dans une logique d'évaluation des risques (démarche HACCP). Le problème majeur actuel se situe au niveau de la fiabilité des résultats.
PDF icon Le challenge test ou test d'épreuve microbiologique
2001