Thermal resistance of Listeria monocytogenes.
Two methods were used to study the thermal resistance of Listeria monocytogenes. The D60 degrees C values ranged from 1.3-6.5 min in an open vessel. D72 degrees C varied from 0.06-1.5 s and z from 3.1-6.5 K (38 strains) in capillary tubes. Therefore a conventional pasteurization process of 15 s at 72 degrees C could assure 10-750 decimal reductions, depending on the strain. Six days enrichment, at 4 degrees C in milk prior to incubation at 37 degrees C, did not show any influence on measured heat resistance (4 strains). A significant difference in thermal resistance among strains according to their serotype was noted: strains belonging to serogroup 1 were more heat resistant than those belonging to serogroup 4.
Lemaire
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V
Université de Tours, Faculté de médecine, Laboratoire de microbiologie, France.
Cerf
O
O
Audurier
A
A
D000818:Animals; D003611:Dairy Products; D004783:Environmental Microbiology; D005516:Food Microbiology; D006358:Hot Temperature; D006801:Humans; D008089:Listeria monocytogenes / Q000145:classification / Q000502:physiology*; D008460:Meat; D008892:Milk / Q000382:microbiology