电子鼻结合主成分分析法快速鉴别掺假牛肉

Quick identification of adulterated beef by electronic nose and principal component analysis

建立了基于电子鼻和主成分分析法鉴别掺假牛肉的方法。按照不同掺假比例,制备了掺混猪肉的牛肉样品,采集了掺假牛肉样品的电子鼻信号,提取第70s的响应值数据进行均值分析,并进行主成分分析。结果表明,不同掺假比例的牛肉样品,在10个传感器上的响应规律不同,主成分分析法可将掺假牛肉分为3大类:纯牛肉样品、掺假牛肉和纯猪肉样品,两个主成分的累计贡献率为96.73%,区分度良好。通过检测验证,表明该方法的识别准确度达97.5%。应用此方法,可以实现检测掺混猪肉的假牛肉的快速、无损筛查鉴别。

A method to identify adulterated beef based on electronic nose and principal component analysis was established.The beef samples mixed with pork were prepared according to different adulteration ratio,and the electronic nose signals of the adulterated beef samples were collected,and the response valueat 70s was extracted for mean analysis,and principal component analysis was conducted.The results showed that beef samples with different adulteration ratio had different responses laws on ten sensors.The adulterated beef could be divided into three categories by principal component analysis,and they were pure beef samples,adulterated beef and pure pork samples,and cumulative contribution rate of the two principal components was 96.73%,and it had good discrimination.Through detection and verification,it showed that the recognition accuracy of this method was 97.5%.When this method was applicated,quick and non-destructive screening and identification of adulterated beef mixed with pork could be realized.