冰温贮藏对梭子蟹品质影响及其货架期模型的建立

为延长梭子蟹的保存期,以即死三疣梭子蟹为研究对象,以冷藏及冰藏为对照,研究冰温(272K)贮藏对梭子蟹品质的影响,并结合梭子蟹的理化指标变化和零级化学动力学模型与Arrhenius方程,建立梭子蟹货架期预测模型,对其剩余货架期进行预测。结果表明,冰温保鲜可有效缓解梭子蟹品质劣变,在贮藏过程中,总挥发性盐基氮(TVB-N)、菌落总数(TVC)及K值的变化速率均较冷藏、冰藏缓慢,货架期延长了1~2 d;建立的梭子蟹货架期预测模型具有较高的拟合精度,预测值和实测值之间的相对误差小于10%,表明该模型能够准确地预测梭子蟹在特定条件下的剩余货架期。本研究结果为冰温技术在梭子蟹保鲜中的应用及梭子蟹剩余货架期的预测提供了理论依据。

Impact of Controlled Freezing-point Storage on the Portunus trituberculatus Quality and Model Construction of Its Shelf-life

To extend the shelf life of Portunus trituberculatus,the effect of freezing-point(272 K) storage on the quality of P.trituberculatus was studied using the refrigeration and iced storage as control groups.The prediction model of shelf life of P.trituberculatus was established combining with the physical-chemical indexes,zero order kinetic model and Arrhenius equation,then the remaining shelf life of P.trituberculatus was estimated by this prediction model.The results showed that the freezing-point storage could effectively postpone the quality deterioration of P.trituberculatus.In the process of freezing-point storage,the change rates of Total Volatile Basic Nitrogen (TVB-N),Total Viable Count (TVC) and K value were slower than those of refrigeration and iced storage,the shelf life of P.trituberculatus was extended about 1 to 2 days.At the same time,the prediction model of shelf life of P.trituberculatus had higher fitting accuracy,the relative error between the forecast values and measure values was less than 10％.It was showed that the model could accurately predict the remaining shelf life of P.trituberculatus under certain conditions.The results provided theory basis for the application of freezing-point preservation and assessment of remaining shelf life of P.trituberculatus.