Behaviour of Listeria monocytogenes under combined chilling processes

Autor: Membré, Jeanne Marie, Ross, T., McMeekin, T.
Přispěvatelé: Laboratoire de Génie des Procédés et Technologie Alimentaires (LGPTA), Institut National de la Recherche Agronomique (INRA), University of Tasmania [Hobart, Australia] (UTAS)
Rok vydání: 1999
Předmět:
Zdroj: Letters in Applied Microbiology
Letters in Applied Microbiology, Wiley, 1999, 28 (3), pp.216-220. ⟨10.1046/j.1365-2672.1999.00499.x⟩
ISSN: 0266-8254
1472-765X
DOI: 10.1046/j.1365-2672.1999.00499.x⟩
Popis: The behaviour of Listeria monocytogenes under chilling processes was investigated. Growth kinetics were measured at 7 degrees C in TSBYE culture medium as a function of pH (7.2 and 6.2), pre-incubation temperatures (4 or 7 degrees C), cooling (0.05 or 0.1 degree C min-1) and freezing (0 and -5 degrees C) treatments. Growth curves generated were fitted by Gompertz and Baranyi functions. The Baranyi function gave better parameter estimation values than the Gompertz equation which over-estimated the specific growth rate values. Listeria monocytogenes grew at 7 degrees C without a lag phase, except when the sub-culture was performed at 37 degrees C, whereas the specific growth rate was affected by the chilling processes. In fact, L. monocytogenes grew slightly faster at 7 degrees C when a 4 degrees C pre-incubation treatment was applied than with a 7 degrees C pre-incubation treatment. These results suggest that to mimic the processes of contamination in industry, predictive microbiology studies with L. monocytogenes should be performed with organisms cultured at low temperatures.
Databáze: OpenAIRE
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