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Analyse métagénomique de la dynamique de l’écosystème bactérien de la viande de porc biopréservée

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Arnaud Bozec et al., 16es Journées Sciences du Muscle et Technologies des Viandes, 21-22 novembre 2016, Paris, France, p. 15-16

Cette étude vise à étudier la possibilité de conservation de viande de porc biopréservée conditionnée sous vide pendant 12 semaines à -1.5°C. Le challenge de la biopréservation est de pouvoir doubler la limite de conservation actuelle qui est de 6 semaines (Bozec et al., 2005), grâce à la maîtrise des flores d’altération et au maintien de la qualité sanitaire des viandes. La comparaison des modalités expérimentales, avec l’utilisation de deux ferments par rapport à un essai témoin non biopréservé a permis de suivre l’évolution bactérienne par microbiologie classique et métagénomique tout au long de la conservation.

ENG

Metagenomic dynamic analysis of the bacterial ecosystem of biopreserved pork meat

The objective of this study was to evaluate the bacterial evolution of biopreserved pork meat, vacuum-packed and stored at a temperature of -1.5° C for 12 weeks. The use of metagenomic analysis allowed a new insight into the bacterial competition taking place. The comparison of control samples to biopreserved meat with two separate Pediococcus acidilactici and Lactobacillus sakei cultures showed three different scenarios. Pediococcus acidilactici survived well for a period of five weeks. Subsequently however, it was then supplanted by the bacterial flora naturally present in the product, which was, in this case, Lactobacillus sakei, C. divergens and Leuconostoc gelidum. Alternatively, the protective culture Lactobacillus sakei showed the ability to maintain the microbiological quality in the vacuum-packed meat at an acceptable level for 12 weeks.

PDF icon Bozec et al.,16es Journées Sciences du Muscle et Technologies des Viandes, 21-22 novembre 2016, Paris
2016

Analyse métagénomique de la dynamique de l’écosystème bactérien de la viande de porc biopréservée

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Poster.

L’objectif de cette étude était d’évaluer la dynamique d’évolution de l’écosystème bactérien de la viande de porc biopréservée et emballée sous vide puis stockée à une température de -1,5 °C pendant 12 semaines. L’analyse métagénomique a été utilisée comme un outil de compréhension de l’évolution des flores.

PDF icon poster de Arnaud Bozec et al., 16es JSMTV, 21-22 novembre 2016, Paris, France
2016

Predictive microbiology combined with metagenomic analysis targeted on the 16S rDNA : A new approach for food quality

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The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods may not be relevant to understand the modifications of the microbial ecology in food products. Metagenomic analysis targeted on 16S ribosomal DNA can elucidate microbial community structures at a muche higher resolution than was previously possible. Combined with predictive microbiological models, a new approach was investigated to take into account bacterial populations dynamics in perishable foods under different environmental conditions. White pudding samples, a typical Belgian pork meat product, were packed under food wrap (atmospheric air condition). Durability studies were conducted at 4°C, 12°C and a dynamic temperature profile according to the NF V01-003 standards (4°C (1/3 of the shelf life) - 8°C (2/3 of the shelf life)) during 15 days. The effect of organic acids was also investigated using a lactic acid (1.8% w/w) treatment. At each day of the trials, classical microbiological (total flora) and 16S rDNA metagenomic analysis were carried out on all these samples. For the metagenomic analysis, a sequencing library was generated, targeting the V1-V3 region of the 16S rDNA. The two major bacterial populations were thus identified (Psychrobacter sp and Brochotrix thermosphacta) and predictive microbiology models used to assess the growth parameters. Cardinal parameters for temperature were collected on the two main bacterial species. The model was validated using the data obtained at a dynamic temperature profile. The results of the simulations for Psychrobacter sp and Brochotrix thermosphacta show a good compliance between predicted and observed data. Compared to culture based methods on selective media and previous independent culture techniques, metagenomic analysis combined with predictive microbiology gives more valuable information, and could be considered as a technological breakthrough to control the quality or for accurately determining shelf life.

PDF icon delhalle2014.pdf
2014

Predictive microbiology combined with metagenomic analysis targeted on the 16S ribosomal DNA: A new approach for food quality

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The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods have therefore been used to assess the microbiological quality of food. These techniques are simple to implement but may not be relevant to understand the modifications of the microbial ecology which occur in the food product in response to different changes in the environmental conditions. Metagenomic analysis targeted on 16S ribosomal DNA can bring about a solution to this new need and elucidate microbial community structures, including the identification and quantification of culturable and non-culturable organisms, at a much higher resolution than was previously possible with culture-based methods to provide a picture of the microbial community. Combined with predictive microbiological models, a new approach was investigated to take into account the dynamics of the evolutions of the microbial community in food products. This work describes the application of a metagenomic analysis and predictive microbiology in order to study bacterial populations dynamics in perishable foods under different environmental conditions.

PDF icon delhalle2013.pdf
2013