Inactivation of Staphylococcus aureus and Salmonella enteriditis in tryptic soy broth and caviar samples by high pressure processing

F. Fioretto (1, 2) , C. Cruz (1) , Alain Largeteau (3) , T. A. Sarli (2) , Gérard Demazeau (3) , A. El Moueffak (1)

1 ERAP - IUT Périgueux
2 Deparment of Inspection of Foods from Animal Origin
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We studied the action of high pressure processing on the inactivation of two foodborne pathogens, Staphylococcus aureus ATCC 6538 and Salmonella enteritidis ATCC 13076, suspended in a culture medium and inoculated into caviar samples. The baroresistance of the two pathogens in a tryptic soy broth suspension at a concentration of 108-109 colony-forming units/ml was tested for continuous and cycled pressurization in the 150- to 550-MPa range and for 15-min treatments at room temperature. The increase of cycle number permitted the reduction of the pressure level able to totally inactivate both microorganisms in the tryptic soy broth suspension, whereas the effect of different procedure times on complete inactivation of the microorganisms inoculated into caviar was similar.

Mots clés: High pressure processing; Staphylococcus aureus; Salmonella enteritidis; Tryptic soy broth; Caviar; Pressure cycles.; Pressure cycles

Domaines: Matériaux; Autre [q-bio.OT]

F. Fioretto, C. Cruz, Alain Largeteau, T. A. Sarli, Gérard Demazeau, et al.. Inactivation of Staphylococcus aureus and Salmonella enteriditis in tryptic soy broth and caviar samples by high pressure processing. Brazilian Journal of Medical and Biological Research, 2005, 38 (8), pp.1259-1265. ⟨10.1590/S0100-879X2005000800015⟩. ⟨hal-00018780⟩