基于电子鼻技术对羊奶粉中掺假牛奶粉的快速检测.docx

基于电子鼻技术对羊奶粉中掺假牛奶粉的快速检测马利杰，贾茹，杨春杰，丁武（西北农林科技大学 食品科学与工程学院，陕西 杨凌 712100）摘 要：利用 基于电子鼻技术对羊奶粉中掺假牛奶粉的快速检测 马利杰，贾茹，杨春杰，丁武 （西北农林科技大学 食品科学与工程学院，陕西 杨凌 712100） 摘 要：利用电子鼻技术结合多种化学计量学方法，对羊奶粉掺假牛奶粉进行了快速定性判别和定量分析。将牛奶粉按不同比例掺 入到羊奶粉中，并按掺假羊奶粉与水为 1∶7.2 的比例配成溶液，进行电子鼻检测。通过电子鼻采集不同比例掺假奶挥发性成分的响应 值，然后利用主成分分析(PCA)、Fisher 线性判别分析(FLDA)以及线性回归拟合分析进行定性判别和定量分析，建立基于电子鼻技术 检测羊奶粉掺假的方法。结果表明，FLDA 及 PCA 都能够区分出不同比例的掺假奶，且 FLDA 区分效果优于 PCA；线性回归拟合分析 的相关系数为 94.8%，预测值与实际掺假值呈现一定的线性关系，表明该模型具有较好的泛化能力。因此利用电子鼻实现羊奶粉掺假 的快速定性判别和定量分析是可行的。 关键词：羊奶粉；牛奶粉；电子鼻；定性判别；定量分析 中图分类号：TS252.7 文献标识码：A 文章编号：1001-2230（2014）11-0047-04 Rapid detection of goat milk powder adulterated milk powder based on elec? tronic nose MA Li-jie, JA Ru, YANG Chun-jie, DING Wu (College of Food Science and Engineering, Northwest AF University, Yangling 712100, China) Abstract: The goat milk powder adulterated milk powder was rapidly qualitatively discriminated and quantitatively analyzed by an electronic nose combined with a variety of chemometric methods. Milk powder was added to the goat milk powder according to the different propor? tions, and then mixed with 7.2 times of water for electronic nose to detect. The volatile components emanating from the adulterated goat milk samples were gathered by the electronic nose. The electronic nose technologies for discriminating the different proportions of adulterat? ed goat milk powder were established through principal component analysis (PCA), fisher linear discriminant analysis (FLDA) and Linear re? gression fitting analysis. The results showed that both PCA and FLDA can discriminate the different proportions of adulterated goat milk pow? der, but FLDA was more effective than PCA. The correlation coefficient of linear regression analysis was 94.8%, the predicted value and the actual adulteration value showed a certain linear relationship, indicating that the model has better generalization ability. So using electronic nose to discriminate the adulterated goat milk powder rapid qualitativ