Modeling the growth of Enterococcus faecium in bologna sausage

A study to set up mathematical models which allow the prediction of Enterococcus faecium growth in bologna sausage (mortadella) was carried out. Growth curves were obtained at different temperatures (5, 6, 12, 15, 25, 32, 35, 37, 42, 46, 50, 52, and 55 degrees C). The Gompertz and logistic models, m...

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Bibliographic Details
Published in:Applied and Environmental Microbiology 1993-10, Vol.59 (10), p.3411-3417
Main Authors: ZANONI, B, GARZAROLI, C, ANSELMI, S, RONDININI, G
Format: Article
Language:English
Subjects:
alimentos
Animals
Bacteria
Bacteriology
biodegradacion
biodegradation
Biological and medical sciences
Cell Division
contaminacion
contamination
crecimiento
croissance
enterococcus
Enterococcus faecium
Enterococcus faecium - growth & development
Food contamination & poisoning
Food Microbiology
foods
Fundamental and applied biological sciences. Psychology
growth
Growth, nutrition, cell differenciation
infeccion
infection
Mathematical models
Meat Products - adverse effects
Meat Products - analysis
Meat Products - microbiology
Microbiology
modele mathematique
modelos matematicos
Models, Biological
produit alimentaire
salchicha
saucisse
sausages
temperatura
Temperature
Time Factors
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Summary:A study to set up mathematical models which allow the prediction of Enterococcus faecium growth in bologna sausage (mortadella) was carried out. Growth curves were obtained at different temperatures (5, 6, 12, 15, 25, 32, 35, 37, 42, 46, 50, 52, and 55 degrees C). The Gompertz and logistic models, modified by Zwietering, were found to fit with the representation of experimental curves. The variations of the parameters A (i.e., the asymptotic value reached by the relative population during the stationary growth phase), micrometer (i.e., the maximum specific growth rate during the exponential growth phase), and lambda (i.e., the lag time) with temperature were then modeled. The variation of A with temperature can be described by an empirical polynomial model, whereas the variation of micrometer and lambda can be described by the Ratkowsky model modified by Zwietering and the Adair model, respectively. Data processing of these models has shown that the minimum growth temperature for E. faecium is 0.1 degrees C. maximum growth temperature is 53.4 degrees C, and the optimal growth temperature is 42 to 45 degrees C.
ISSN:0099-2240
1098-5336
DOI:10.1128/aem.59.10.3411-3417.1993