Pressure- vs. heat-induced bacterial stress in cooked poultry sausages: a preliminary study.
Vacuum-packaged poultry cooked sausages were pressure-treated at 500 MPa by combinations of time (5-45 min) and temperature (2-80 degrees C) and later stored at 6-8 degrees C for 12 we. Mesophile and psychrotrophe counts were determined 1 d, 3, 6, 9 and 12 we after treatment and compared with those of cooked sausages pasteurized at 80-85 degrees C for 40 min. Both pressure and heat treatments offer great possibilities for preservation. Sausages pressurized at 65 degrees C for 15 min showed mesophile numbers below 2 log cfu g(-1) throughout the chill storage. Pressurization, unlike heat treatment, causes a reversible bacterial stress. Thus, injured cells recovered during storage and, at 6 and 12 we, after a temperature abuse (room temperature for approx. 24 h), counts increased up to 6.5 - 7.5 log units. Psychrotrophes were more sensitive to both treatments; no growth was detected the day after (a lethality of more than 4 log units).
Yuste
J
J
Technologia dels Aliments (CeRTA), Facultat de Veterinària, Universitat Autònoma de Barcelona, Spain.
Mor-Mur
M
M
Capellas
M
M
Pla
R
R
D015169:Colony Count, Microbial; D003296:Cooking; D005511:Food Handling; D005516:Food Microbiology; D005519:Food Preservation; D006358:Hot Temperature; D008461:Meat Products / Q000382:microbiology*; D011312:Pressure