基于气味指纹预测养殖大黄鱼贮藏过程中的品质变化

摘要

The changes in volatile aroma and related indexes of cultured large yellow croaker during ice storage were examined using an electronic nose.Using samples stored at room temperature as the control,the electronic nose data were analyzed by principal component analysis and partial least squares（PLS） regression and meanwhile,least linear regression was carried out on the results of total volatile basic nitrogen（TVB-N）,trimethyl amine（TMA）,and total viable count（TVC） in order to create a prediction model for quality changes of large yellow croaker.TVB-N,TMA,and TVC levels in large yellow croaker stored in ice or at room temperature increased with prolonged storage time.Electronic nose could accurately discriminate large yellow croaker samples stored under the different conditions.The correlation coefficients of PLS calibration models for TVB-N,TMA and TVC were 0.9884,0.9889 and 0.9648 for ice-stored samples and 0.9878,0.9915 and 0.9924 for sampled stored at room temperature,respectively.%在模拟市场环境冰鲜贮藏条件下,采用电子鼻对大黄鱼不同贮藏时间的挥发性气味及相关指标变化进行分析。以室温贮藏作对照,对电子鼻数据进行主成分分析与最小线性回归分析,并与挥发性盐基氮、三甲胺及菌落总数进行最小线性回归分析,建立大黄鱼在冰鲜贮藏条件下品质变化的预测曲线。结果表明：冰鲜和室温保存的大黄鱼挥发性盐基氮、三甲胺与菌落总数值均随着贮藏时间的延长而增多;电子鼻能很好地区分冰鲜和室温贮藏的大黄鱼随时间的气味变化;基于电子鼻最小线性回归分析拟合的气味信号值与该贮藏条件下的菌落总数、挥发性盐基氮、三甲胺相关系数,冰鲜贮藏条件下分别为0.9884、0.9889和0.9648,室温分别为0.9878、0.9915和0.9924。