Caco-2 Invasion by Cronobacter sakazakii and Salmonella enterica Exposed to Drying and Heat Treatments in Dried State in Milk Powder

Abstract : Due to the ability of foodborne pathogens to survive in low moisture food, the decontamination of milk powder is an important issue in food protection. The safety of food products is, however, not always insured and the different steps in the processing of food involve physiological and metabolic changes in bacteria. Among these changes, virulence properties may also be affected. In this study, the effect of drying and successive thermal treatments on the invasion capacity of Salmonella Typhimurium, Salmonella Senftenberg, and Cronobacter sakazakii was assessed. Bacteria were dried on milk powder at three different water activity levels (0.25, 0.58, and 0.80) and heated at two different temperatures (90 degrees C and 100 degrees C) for 30 and 120 s. After recovery, stressed bacterial populations were placed in contact with Caco-2 cells to estimate their invasion capacity. Our results show that drying increases the invasion capacity of foodborne pathogens, but that heat treatment in the dried state did not exert a selective pressure on bacterial cells depending on their invasion capacity after drying. Taken together, our findings add to the sum of knowledge on food safety in dried food products and provide insight into the effects of food processing.
Type de document :
Article dans une revue
Frontiers in Microbiology, Frontiers Media, 2017, 8, 〈10.3389/fmicb.2017.01893〉
Liste complète des métadonnées

https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01618841
Contributeur : Pam - Université de Bourgogne <>
Soumis le : mercredi 18 octobre 2017 - 15:35:05
Dernière modification le : vendredi 23 février 2018 - 12:18:07

Lien texte intégral

Identifiants

Collections

Citation

Émilie Lang, Stéphane Guyot, Pablo Alvarez-Martin, Jean-Marie Perrier-Cornet, Patrick Gervais. Caco-2 Invasion by Cronobacter sakazakii and Salmonella enterica Exposed to Drying and Heat Treatments in Dried State in Milk Powder. Frontiers in Microbiology, Frontiers Media, 2017, 8, 〈10.3389/fmicb.2017.01893〉. 〈hal-01618841〉

Partager

Métriques

Consultations de la notice

20