猪肉储藏时间的电子鼻区分方法

用电子鼻对不同储藏时间(0~6 d)的猪肉样品进行区分,并确定电子鼻区分不同储藏时间肉品的较佳实验参数.对传感器信号进行多因素方差分析(analysis of variance,ANOVA)表明:对于固定容器的猪肉样品,不同的样品质量对电子鼻响应信号的影响极为显著;其次是样品在烧杯内的密封时间.通过单因素方差分析和区分度指标检验,得出猪肉在500 mL烧杯内的最佳参数为样品质量10 g、密封时间5 min.采用以上参数,对储藏0~6 d的猪肉样品进行辨别,结果发现不管是运用主成分分析(principle components analysis,PCA)还是线性判别分析(linear discri minant analysis,LDA),电子鼻都能很好地区分不同储藏天数的猪肉样品.

Discrimination of different storage time of the pork by electronic nose

An electronic nose (e-nose,PEN 2) was employed to classify the pork groups with different storage times (0-6 d) . To acquire the optimum experimental procedure,the method of analysis of variance (ANOVA) was adopted . The results showed that the mass of the pork samples affected highly significantly the result of discrimination,and next was the headspace-generated time . By applying one-way ANOVA and discrimination power (DP),the optimum experimental parameters were acquired :10 g sample with 5 min headspace-generated time . The later experiment was taken under the optimum experimental parameters,and the principle components analysis (PCA),as well as linear discriminant analysis (LDA) were employed . The result showed that e-nose with the optimum parameters could classify the samples stored0-6 d well .