Note. Antimicrobial Effect of Pressurized Carbon Dioxide on Yersinia enterocolitica in Broth and Foods

Abstract

Antimicrobial effect of 15, 30 and 60 atm CO 2 pressures was studied on Yersinia enterocolitica at 25, 35 and 45 °C. Two stages were observed in the destruction curves. The earlier stage was characterized by a slow rate of inactivation in number of Y. enterocolitica, which increased sharply at the later stage. An increase of pressure and/or temperature enhanced the antimicrobial effects of CO 2. The D values of 6.1 and 4.9 min were obtained for Y. enterocolitica at 45 °C under 15 and 30 atm CO 2 pressure, respectively, while only 1.3 min D value was found at 60 atm. A rapid and significant (p < 0.05) reduction was obtained in the number of Y. enterocolitica at treated pressures and temperatures. Pressure, temperature, exposure time, and the suspending medium influenced the inactivation rates of Y. enterocolitica.

Keywords

high-pressure carbon dioxide Yersinia enterocolitica inactivation

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