Comparison and Evaluation of Models for the Growth of Shewanella putrefaciens at Different Temperatures

doi:10.7506/spkx1002-6630-201613026

Abstract

Abstract:

The specific spoilage bacterium Shewanella putrefaciens isolated from refrigerated large yellow croaker was
grown at 5, 8, 15 and 25 ℃ in tryptone soy broth and the modified Gompertz equation, the modified Logistic equation and
the Baranyi equation were applied to fit its growth kinetic models. Further, a second-order model was established using
the Belehradek equation indicating the influence of temperature on the growth kinetics of Shewanella putrefaciens, and the
goodness of fit and applicability of the models were examined. The results showed that temperature remarkably affected the
growth kinetics of Shewanella putrefaciens. The growth of Shewanella putrefaciens was significantly inhibited at 5 ℃ with
a longer lag phase. At temperature up to 25 ℃, the lag phase of growth was reduced significantly. The specific growth rate
increased with temperature. Moreover, linear relationships between temperature and either the specific growth rate or the lag
period of growth were observed. Root mean square error (RMSE), residual sum of squares (RSS), bias factor (BF), accuracy
factor (AF) and R2 were used to evaluate the goodness of fit of the developed models. The results showed that the evaluation
parameters RSS, RMSE of the modified Logistic model were minimal, and BF and AF values were close to 1, suggesting that
the goodness of fit and applicability of the modified Logistic model were the best. Therefore, the modified Logistic model
can be used to predict the growth of Shewanella putrefaciens in aquatic products.

Key words: Shewanella putrefaciens, temperature, growth kinetics, goodness of fit

CLC Number:

S983

ZHU Yanqi, GUO Quanyou, LI Baoguo, JIANG Chaojun. Comparison and Evaluation of Models for the Growth of Shewanella putrefaciens at Different Temperatures[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201613026.

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