Kinetics modelling of microbial growth in Nile tilapia (Oreochromis niloticus ) fillets at the final stage of cold supply chain
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This study was performed to build kinetics models for the growth of total viable counts (TVC) and Pseudomonas spp. in Nile tilapia (Oreochromis niloticus ) fillets at the conditions simulating logistics at low temperatures and possible abuses. The modeling process was to determine the parameters of a primary model of Baranyi & Roberts, and as those of a secondary model of Ratkowsky, the so-called square root model. The TVC growth rate (μ max) was from 0.02 (1/h) at 1 ± 1℃ to 0.46 (1/h) at ambient temperatures (30℃–33.5℃). The lag phase duration (λ ) was found to decrease from 67.05 ± 43.45 h at 1 ± 1℃ to 1.4 ± 1.38 h at 30℃–33.5℃. Meanwhile, the growth rate of Pseudomonas spp. increased from 0.06 (1/h) at 1 ± 1℃ to 0.63 (1/h) at ambient conditions. The lag phase of Pseudomonas spp. dropped from 143.79 ± 20.57 h at 1 ± 1℃ to only 1.13 ± 1.61 h at 30℃–33.5℃. Regarding the secondary models, TVC had the minimum growth temperature (Tmin) of 0.23 ± 0.05℃, while that of Pseudomonas spp. was 6.48 ± 19.92℃. The developed models could be applied to predict the TVC and Pseudomonas spp. counts based on the cold chain temperature history.
Abstract
This study was performed to build kinetics models for the growth of total viable counts (TVC) and Pseudomonas spp. in Nile tilapia (Oreochromis niloticus ) fillets at the conditions simulating logistics at low temperatures and possible abuses. The modeling process was to determine the parameters of a primary model of Baranyi & Roberts, and as those of a secondary model of Ratkowsky, the so-called square root model. The TVC growth rate (μ max) was from 0.02 (1/h) at 1 ± 1℃ to 0.46 (1/h) at ambient temperatures (30℃–33.5℃). The lag phase duration (λ ) was found to decrease from 67.05 ± 43.45 h at 1 ± 1℃ to 1.4 ± 1.38 h at 30℃–33.5℃. Meanwhile, the growth rate of Pseudomonas spp. increased from 0.06 (1/h) at 1 ± 1℃ to 0.63 (1/h) at ambient conditions. The lag phase of Pseudomonas spp. dropped from 143.79 ± 20.57 h at 1 ± 1℃ to only 1.13 ± 1.61 h at 30℃–33.5℃. Regarding the secondary models, TVC had the minimum growth temperature (Tmin) of 0.23 ± 0.05℃, while that of Pseudomonas spp. was 6.48 ± 19.92℃. The developed models could be applied to predict the TVC and Pseudomonas spp. counts based on the cold chain temperature history.