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| Establishment of Predictive Model for the Growth of Pseudomonas spp. in Modified Atmosphere Packaged Duck Breast Meat |
| ZHAO Jianlan, HE Li, HOU Wenfu, WANG Hongxun* |
| College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China |
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Abstract This work reports the establishment of a predictive model describing the growth of Pseudomonas spp. in modified atmosphere packaged (MAP) duck breast meat during storage at 0 –20 ℃. Results show that the spoilage limit was 6.344 2 (lg (CFU/g)) in terms of total volatile basic nitrogen (TVB-N), total number of colonies, number of Pseudomonas spp. colonies and sensory evaluation. The Gompertz model could accurately describe the growth of Pseudomonas spp. The experimental data were well fitted to the predictive growth curves at different temperatures. The goodness of fit of the first-order model was satisfactory with accuracy factor (Af), bias factor (Bf) around 1. The second-order models indicating maximum specific growth rate and lag phase duration as a function of temperature respectively were developed using square-root model. The shelf life prediction model was proposed based on the first- and second-order models and validated for its accuracy at 7 ℃.
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