Modelling the growth kinetics of Listeria as a function of temperature, pH and organic acid concentration

Growth rate and growth probability of Listeria monocytogenes in dairy, meat and seafood products in suboptimal conditions

“…Therefore, the average CPP of models excluding interactions was 47% for data corresponding to h-values between )0AE1 and 0AE1 even though the average CPP of models including interactions was 63% for the same data. The new cardinal model including interactions was then preferred to the other models for two reasons: first, it was more effective to predict the growth/no-growth limits and secondly, its analytical form was simpler than the form proposed by Le Marc et al (2002). This model was based on the same hypothesis concerning the growth/no-growth interface as the model proposed by Augustin and Carlier (2000b) but it now progressively takes into account the effect of interactions between environmental factors on the growth rate in the manner proposed by Le Marc et al (2002), with a -0·8 -0·6 -0·4 -0·2 0·2 0·4 0·6 0·8 0·2 Growth probability 0·4 0·6 0·8 1 0 q 0 Fig.…”

“…The new cardinal model including interactions was then preferred to the other models for two reasons: first, it was more effective to predict the growth/no-growth limits and secondly, its analytical form was simpler than the form proposed by Le Marc et al (2002). This model was based on the same hypothesis concerning the growth/no-growth interface as the model proposed by Augustin and Carlier (2000b) but it now progressively takes into account the effect of interactions between environmental factors on the growth rate in the manner proposed by Le Marc et al (2002), with a -0·8 -0·6 -0·4 -0·2 0·2 0·4 0·6 0·8 0·2 Growth probability 0·4 0·6 0·8 1 0 q 0 Fig. 4 Evolution of the growth probability of Listeria monocytogenes in microbiological media according to the function h describing the effects of temperature, pH, water activity, nitrite, phenol and CO 2 , and their interactions.…”

“…Two different models excluding interactions between environmental factors were evaluated: a cardinal parameter growth model (model #1) and a square root type growth model (model #2). Three different models including interactions between environmental factors were evaluated: a modified form of the cardinal model proposed by Augustin and Carlier (2000b) (model #3), an expanded form of the cardinal model proposed by Le Marc et al (2002) (model #4) and a new model derived from the two previous ones (model #5). This new model is based on the assumptions of Le Marc et al (2002) regarding the effect of the interactions between environmental factors within the growth range of L. monocytogenes and keeps growth/no-growth boundaries on the form of the model proposed by Augustin and Carlier (2000b).…”

“…te Giffel and Zwietering (1999) have shown that models excluding interactions between environmental factors were in many cases sufficiently accurate to predict the growth rate of L. monocytogenes in food. To increase the performance of these models near the growth/no-growth interface of L. monocytogenes, modifications of these models have been proposed to take into account interactions between environmental factors (Augustin and Carlier 2000b;Le Marc et al 2002). In parallel, probability models have been proposed to describe the growth probability of L. monocytogenes Koutsoumanis et al 2004) in microbiological media.…”

Principles and Methodologies for the Determination of Shelf-Life in Foods

“…For the effects of temperature and pH, n is set to 2 and 1 respectively (Augustin et al, 2000a(Augustin et al, , 2000bLe Marc et al, 2002;Pouillot et al, 2003Rosso et al, 1993. For the effects of a w , n is set to 2 (Augustin et al, 2000a(Augustin et al, , 2000bRosso & Robinson, 2001).…”