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    Development and validation of growth models using one-step modelling approach for determination of chicken meat shelf-life under isothermal and non-isothermal storage conditions
    (Food Reseach Institute, 2021) Tarlak, F.; Khosravi-Darani, K.
    The main objective of the present study was to investigate and simulate the effect of storage temperature on spoilage of aerobically stored chicken meat using two-step and one-step modelling approaches. For this purpose, the fitting capability of various primary models was evaluated for total bacterial counts in aerobically stored chicken meat. The one-step modelling approach considerably improved the fitting capability whichever primary model was used. The statistical indices (bias factor = 0.999 and accuracy factor = 1.194) showed that the best prediction performance for prediction of maximum specific bacterial growth rate values was obtained by the one-step modelling approach involving the Huang model. The prediction performance of the Huang model was also assessed for various non-isothermal storage conditions, and this model provided satisfactory statistical indices (1.027 > bias factor > 1.064 and 1.069 > accuracy factor > 1.085). The validated one-step modelling approach exhibited good performance as a prediction tool for the determination of chicken meat spoilage; therefore the chicken meat shelf-life was predicted as a function of storage temperature. The shelf-life decreased from 58 h (2.4 days) to 16 h (0.7 days) when the storage temperature was increased from 4 °C to 15 °C. © 2021 National Agricultural and Food Centre (Slovakia).
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    Prediction of growth kinetics of Bacillus tequilensis in nutrient broth under isothermal and non-isothermal conditions
    (Sociedade Brasileira de Ciencia e Tecnologia de Alimentos, SBCTA, 2023) Emtiazi, G.; Ghoreishi, F.S.; Darani, K.K.; Yücel, Ö.; Tarlak, F.
    The main objective of the present study was to develop and validate a new alternative modelling method to predict Bacillus tequilensis count in nutrient broth under iso-thermal and non-isothermal conditions. The bacterial growth data of Bacillus tequilensis was obtained experimentally in aerobically-kept nutrient broth medium and described with two-step and one-step modelling approaches by different primary models (the modified Gompertz, logistic, Baranyi and Huang models) under isothermal temperatures. Temperature-dependent kinetic parameter (maximum specific growth rate ‘µmax ’) was described as a function of temperature via the Ratkowsky model integrated with each primary model. The Huang model based on the one-step modelling approach yielded the best fitting results (RMSE = 0.143 and adjusted-R2 = 0.977) for all isothermal conditions. Therefore, the Huang model was also used to check it’s prediction capability under non-isothermal conditions. The differential form of the Huang model provided satisfactorily statistical indexes (Bf = 1.07 and Af = 1.08) indicating reliably being able to use to describe the growth behaviour of Bacillus tequilensis in broth subjected to non-isothermal conditions. © 2023, Sociedade Brasileira de Ciencia e Tecnologia de Alimentos, SBCTA. All rights reserved.