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PREDICTION OF THE MAXIMAL GROWTH RATE OF Listeria monocytogenes IN SLICED MORTADELLA BY THE SQUARE ROOT TYPE MODEL

PREDICTION OF THE MAXIMAL GROWTH RATE OF Listeria monocytogenes IN SLICED MORTADELLA BY THE SQUARE ROOT TYPE MODEL

26/01/2017

P. DAMINELLI1, E. DALZINI1, E. COSCIANI-CUNICO1, G. FINAZZI1, S. D'AMICO1 and M.N. LOSIO1


1Department of Food Microbiology, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "B. Ubertini" (IZSLER), A. Bianchi 9, 25124 Brescia, Italy

 

 

Ital. J. Food Sci., vol. 26 - 2014

 

 

The growth parameter (maximum specific growth rate, μmax) of two different strains of Listeria monocytogenes on sliced Mortadella were calculated. Three batches of sliced Mortadella were vacuum packed, stored at 8°C and samples collected at different time intervals were enumerated for L. monocytogenes. The pathogen counts were fitted using the DMFit version 2.1 Excel® add-in, based on Baranyi model, to determine the specific growth rates. At 8°C the sliced Mortadella supported rapid and prolific L. monocytogenes growth: The μmax varied between 0.035/h and 0.044/h, and the pathogen counts increased up to 108 CFU/g after 21-27 days. A square root type model, Ratkowsky model, was used to describe how μmax changes as a function of storage temperature. Growth kinetics data could be useful for establishing a safe shelf life, once the product could be post process contaminated and stored under different handling scenarios.