Analysis of a novel class of predictive microbial growth models and application to coculture growth

Influence of a gel microstructure as modified by gelatin concentration on Listeria innocua growth

“…The molten gel was whirl mixed to ensure uniform distribution of bacterial cells and an appropriate amount of this solution was serially diluted in peptone salt water and plated onto a selective medium (i.e., BHIYEG supplemented with agar (Oxoid), 18 g L À 1 and LiCl (UCB), 5 g L À 1 ) using a spiral plater (EddyJet, IUL Instruments). This medium was used for the selective enumeration of L. innocua in coculture with Lactococcus lactis in a study conducted in a liquid medium (Poschet, Vereecken, Geeraerd, Nicolaï, & Van Impe, 2005;Vereecken, 2002) and this may be extended for growth in a (semi-)solid gel medium in the near future. The plates were incubated at 37 -C for 24-30 h and the average number of viable bacterial cells were determined from duplicate or triplicate readings.…”

Quantitative prediction of microbial behaviour during food processing using an integrated modelling approach: a review

“…The Baranyi model is widely used for a number of reasons: (i) it is easy to use, (ii) it is applicable under dynamic environmental conditions, (iii) it has a good fitting capacity, and (iv) most of the model parameters are biologically interpretable. However, some authors have pointed out the fact that contrary to the adjustment function, the inhibition function is not mechanistically inspired [14,15].…”

“…Van Impe et al [14] and Poschet et al [15] proposed a new class of models with the following properties:…”

S & P-Type Models: a Novel Class of Predictive Microbial Growth Models

“…A more elaborated P-model describing the interaction between a target organism, Listeria innocua, and a microbial antagonist, the lactic acid bacterium Lactococcus lactis is presented in Poschet et al (2005), based on the combination of research results reported in Vereecken et al (2001), , , Vereecken et al (2003). A nutrient depletion model was constructed by Leroy and Devuyst (2001) by taking into account three inhibition factors for the growth of a bacteriocin-producing Lactobacillus sakei strain: (i) a factor for the effect of sugar concentration (Monod-type), (ii) a factor for the effect of the produced lactic acid (as in Passos et al, 1993Passos et al, & 1994, and (iii) a factor for the effect of the biomass concentration itself.…”