Application of the Global Stability Index Method to Predict the Quality Deterioration of Blunt-snout Bream (Megalobrama amblycephala) during Chilled Storage

To study the quality changes of blunt-snout bream (Megalobrama amblycephala) stored at chilled temperature (0-9 degrees C), a global stability index (GSI) method was developed. Sensory score, total aerobic counts (TAC), total volatile basic nitrogen (TVB-N), and K value (as a percentage of the ratio between HxR (hypoxanthine riboside)+Hx (hypoxanthine) to the total ATP (adenosine triphosphate) and its degradation products) were determined to form a GSI value, and a predictive model of GSI was established by combining zero order kinetics with the Arrhenius equation. The results showed that the goodness of fit remained a high level (R-2>0.97), the activation energy (EA) and the corresponding pre-exponential factor (k(0)) were 83.49 kJ/mol and 4.78x10(14) respectively. Relative errors between experimental GSI values and predicted GSI values were all within +/-15% before the 15th day. Therefore, the model could effectively predict the quality deterioration of blunt-snout bream during chilled storage.