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Food Microbiology
40, 2014; Pages: 9 - 17

Evaluation of the spoilage potential of bacteria isolated from spoiled cooked whole tropical shrimp (Penaeus vannamei) stored under modified atmosphere packaging

Sabrina Macé, Mireille Cardinal, Emmanuel Jaffrès, Josiane Cornet, Valérie Lalanne, Frédérique Chevalier, Thierry Sérot, Marie-France Pilet, Xavier Dousset, Jean-Jacques Joffraud

LUNAM Université, ONIRIS, Université Nantes, UMR1014 Secalim, Nantes, F-44307, France.

The spoilage potential of isolates belonging to five bacterial groups/species (Shewanella baltica,Carnobacterium maltaromaticumAeromonas salmonicidaVibrio sp., “other Gamma-Proteobacteria” [containing one strain of Pseudoalteromonas sp. and one strain of Psychrobacter sp.]) isolated from spoiled cooked and whole tropical shrimp stored under modified atmosphere packaging (MAP) was evaluated by inoculation into ionized cooked and peeled tropical shrimp followed by storage for 32 days at 8 °C. Microbial growth and sensory changes were monitored during the storage period. The major spoilage bacterial isolate groups were C. maltaromaticum and S. baltica. In order to characterize their spoilage potential further and to study the effect of their interactions, each of these two specific spoilage organisms (SSO) and one mixed-culture, C. maltaromaticum/S. baltica, were tested using a combination of complementary methods: molecular (PCR-TTGE), sensory, chemical, and conventional microbiological analyses. It was concluded that, in the mixed-culture-inoculated samples, both species groups imposed their spoilage characteristics.

Keywords: Spoilage potential; Bacterial interaction; Specific spoilage organism; Cooked tropical shrimp; Volatile compounds



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