High Pressure Destruction Kinetics of<i>Clostridium Sporogenes</i>Spores in Salmon Slurry at Elevated Temperatures

Abstract

Salmon slurry containing C. sporogenes spores was subjected to high pressure (HP) treatments (700–900 MPa; 80–100°C, and 0–24 min). Destruction rates (D value) and pressure/temperature sensitivity parameters (ZP and ZT ) were evaluated. Thermal treatment D values were an order of magnitude higher than those under HP. Higher pressures and temperatures accelerated the spore destruction rates. ZP values were 14.5, 17.3 and 15.5°C at 700, 800 and 900 MPa respectively, while ZT values (at constant temperature) were 440, 540, 550 MPa at 80, 90, and 100°C, respectively. The z value under thermal treatment was 8.8°C. The spores were relatively more sensitive to temperature than to pressure.