Predictive Modeling of the Competitive Growth of Listeria monocytogenes and Pseudomonads spp. in Pork

doi:10.7506/spkx1002-6630-201323052

Abstract

Abstract:

To predict the shelf-life of pork, Baranyi model and Lotka-Volterra model were used to establish a model for the
competitive growth of Listeria monocytogenes and Pseudomonads spp. in pork. Interaction coefficients (α) were calculated
from the steady-state equation of a modified Lotka-Volterra model. The results indicated that at lower temperature,
L. monocytogenes could inhibit the growth of Pseudomonads spp. (α ＞ 0), especially at 4 ℃, which represents the strongest
inhibitory effect, while Pseudomonads spp. showed no significant inhibitory effect on L. monocytogenes. To validate the
model, the L. monocytogenes growth data of in pork acquired from the ComBase database were used to calculate bias and
accuracy factors. At 4 ℃, the bias factor was 1.207, indicating the model to be fail-safe, and the accuracy factor was 1.362,
suggesting good prediction accuracy.

Key words: pork, Listeria monocytogenes, Pseudomonads spp., competitive growth model, mixed growth

CLC Number:

TS201.3

CHEN Er-ning，BAI Yu，MA Kai，LIU Qing-jun，WU Hui-juan，GAO Li-juan*. Predictive Modeling of the Competitive Growth of Listeria monocytogenes and Pseudomonads spp. in Pork[J]. FOOD SCIENCE, 2013, 34(23): 256-260.

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