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SHELF LIFE PREDICTION OF DRIED PSEUDOSCIAENA POLYACTIS PRESERVED AT ROOM TEMPERATURE THROUGH KINETIC MODELS

LIN Lin;SUN Ai;XIE Chao;School of Food Science and Pharmacy,Zhejiang Ocean University;  
To predict the shelf life of dried Pseudosciaena polyactis, kinetic models were developed to predict the shelf life of dried P. polyactis. Total bacterial count(TBC), acid value and peroxide value at different storage temperatures(30, 35 and 40°C) were accessed to research the relation between the shelf life and temperature. The kinetic models of TBC, acid value and peroxide value with respect to preservation time and temperature were established based on Arrhenius equation. The high regression coefficients(R20.9) indicated the acceptability of the first order reaction and Arrhenius model for predicting the changes of TBC, acid value and peroxide value of dried P. polyactis. Activation energies(Ea) and rate constants(k0) of TBC, acid value and peroxide value were obtained. They were 29.26kJ/mol, 4.46×102, 47.05kJ/mol, 4.1×105, 49.76kJ/mol, 1.53×106, respectively. Compared with observed shelf life of P. polyactis stored at 37 and 42°C, relative error between predicted and observed shelf life were ?4.68% and ?6.25%, respectively. Shelf life of dried P. polyactis was 500 days at 20°C and 352 days at 25°C through extrapolation of Arrhenius equation.
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