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Predictive modeling for growth of non- and cold-adapted Listeria Monocytogenes on fresh-cut cantaloupe at different storage temperatures

Yoon-Ki Hong, Won Byong Yoon, Lihan Huang, Hyun-Gyun Yuk
Journal of food science 2014 v.79 no.6 pp. M1168
Listeria monocytogenes, bacterial contamination, cantaloupes, food contamination, food microbiology, food storage, fresh-cut foods, models, storage temperature
The aim of this study was to determine the growth kinetics of Listeria monocytogenes, with and without cold-adaption, on fresh-cut cantaloupe under different storage temperatures. Fresh-cut samples, spot inoculated with a four-strain cocktail of L. monocytogenes (about 3.2 log CFU/g), were exposed to constant storage temperatures held at 10, 15, 20, 25 or 30 deg. C. All growth curves of L. monocytogenes were fitted to the Baranyi, modified Gompertz, and Huang models. Regardless of conditions under which cells grew, the time needed to reach 5 log CFU/g decreased with the elevated storage temperature. Experimental results showed that there were no significant differences (P greater than 0.05) in the maximum growth rate k (log CFU/g per h) and lag phase duration L (h) between the cultures of L. monocytogenes with or without previous cold-adaption treatments. No distinct difference was observed in the growth pattern among three primary models at various storage temperatures. The growth curves of secondary modeling were fitted on an Arrhenius-type model for describing the relationship between k and temperature of the L. monocytogenes on fresh-cut cantaloupe from 10 to 30 deg. C. The root mean square error (RMSE) values of secondary models for non- and cold- adapted cells were 0.018, 0.021, and 0.024, and 0.039, 0.026 and 0.017 at the modified Gompertz, Baranyi, and Huang model, respectively, indicating that these three models presented the good statistical fit. This study may provide valuable information to predict the growth of L. monocytogenes on fresh-cut cantaloupes at different storage conditions.