摘要
利用电子鼻对鲳在不同贮藏温度与贮藏时间下的挥发性气味变化进行了分析,并对电子鼻测定获得的数据进行了主成分分析(PCA)与判别因子分析(DFA)。将电子鼻PCA与DFA分析获得的鲳的气味变化突变点作为气味变化的切分点与理化品质指标值(菌落总数)相结合,建立了鲳在273~283K下的Q10货架期预测模型。结果表明,电子鼻PCA与DFA分析能很好地将贮藏于273、283与293K下的鲳随着贮藏时间变化的气味进行区分。贮藏于不同温度条件下的鲳的TVBN与菌落总数值回归拟合方程均符合一级化学动力学模型(R2>0.95)。基于电子鼻PCA与DFA分析获得的283K与293K下的气味变化切分点与相同温度下理化品质指标变化具有较好的对应关系,采用Arrhenius动力学模型推导公式求得鲳在273~283K与283~293K温度段内菌落总数的Q10值,并结合283K与293K温度下电子鼻PCA与DFA分析获得的气味变化货架期切分点,从而得到鲳在273~283K与283~293K温度段内的Q10货架期预测模型为:SL(275~283K)=3×3.008 (283-T)/(10)与SL(283~293K)=1.5×3.423 (293-T)/(10)。上述模型预测的货架期与实测值的相对误差均小于10%。所获得的两个温度段下的货架期预测模型能很好地对273~283K与283~293K温度段下鲳的货架期进行预测。
In this paper, an application of the electronic nose was used to evaluate the freshness quality difference of the pomfret(Pampus argenteus ) fillet under different storage periods and storage temperatures. The raw data of the pomfret fillet of the electronic nose analysis was analyzed by principal compounds analysis (PCA) and discriminate factorial analysis (DFA). The Q10 model of the pomfret fillet by applying both chemical assays and olfactometric (e-nose) method was developed. The result showed that the sample stored at 273 K, 283 K and 293 K could be well discriminated by 18 Metal Oxide Sensors. Changes in total volatile base-nitrogen (TVBN) and total viable count ( TVC ) of pomfret fillet with respect to different storage time and temperature conformed to the first kinetic model with high regression coefficients (R^2 〉 0.95). Using PCA and DFA analysis of Alphasoft 11. 0 and Arrhenius kinetic model, the Q10(273~283K) and Q10(283-293 K) model of shelf-life of pomfret fillet was SL(275~283K)=3×3.008 283-τ/10 and SL(283-293K)=1.5×3.423 283-τ/10. It was shown from the reliability assessment between predictive and observed shelf-life that relative error was within 10% calculated by the prediction model for the shelf-life of pomfret fillet. The remaining shelf-life of pomfret fillet could be predicted at the storage temperature from 273 K to 283 K and 283 K to 293 K based on the Q10(273 -283 K) and Q10(283 -293 K) model.
出处
《水产学报》
CAS
CSCD
北大核心
2010年第3期367-374,共8页
Journal of Fisheries of China
基金
"十一五"国家科技支撑计划重点项目(2006BAD30B03)
上海市科技创新行动计划(08391911500)
上海市教委第五期重点学科资助
关键词
鲳
电子鼻
动力学模型
挥发性盐基氮
总菌落数
Pampus argenteus
electronic nose
kinetic model
total volatile base-nitrogen
total viable count