摘要:
为建立真空包装狮子头货架期预测模型,分析不同温度贮藏期间狮子头中菌落总数的变化情况,分别用线性模型、修正的Gompertz模型、修正的Logistic模型和Baranyi模型对狮子头中菌落总数进行一级模型的拟合,在此基础上使用平方根模型建立二级模型。通过比较各模型的评价参数选择最优模型,并进一步建立货架期预测模型。结果表明在一级模型中,修正的Gompertz模型对真空包装狮子头中菌落总数生长曲线的拟合优度最高;基于修正的Gompertz模型建立的平方根模型可较好地描述温度对狮子头最大比生长速率和迟滞期的影响。在4、10、15、20、25℃条件下贮藏狮子头的货架期分别为80.79、45.22、10.96、4.96、4.01 d,货架期实测值与预测值的相对误差值均在10%以内,表明建立的模型可以较准确地对贮藏在4~25℃条件下的狮子头进行货架期预测。
Abstract:
In order to study the shelf-life prediction model of vacuum-packed Shizitou(a traditional Chinese-style meatball),the changes of the total viable counts in Shizitou,stored at different temperatures were investigated. The linear model,modified Gompertz model,Logistic model and Baranyi model were used to establish the primary growth models,the square root equation was used as a secondary model. An optimal model was chosen for the establishment of shelf life prediction model based on the evaluation parameters. The results indicated that the modified Gompertz model worked best to fit the experimental data,and the effect of temperature on the maximum growth rate and lag phase could be well described with the square root model. The predicted shelf-life of Shizitou at 4,10,15,20,25℃ were 80.79,45.22,10.96,4.96,4.01 d,respectively. The relative deviation between the measured value and the predicted value were within 10%,indicating that the shelf life of Shizitou stored at 4~25℃ could be satisfactorily predicted with the modified Gompertz model.
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