Terahertz spectroscopy and chemometric tools for rapid identification of adulterated dairy product

Terahertz spectroscopy has been investigated as a quick and non-destructive evaluation method to identify adulterated dairy products. Compared with the traditional identification methods, terahertz spectroscopy measurements can easily distinguish different adulterated dairy products according to the fatty acids, without pretreatment of the sample. Terahertz spectra are collected from samples of whole samples both without pretreatment. The difference between the spectra of samples can be observed with the fatty acids. This paper is using terahertz spectroscopy combination with chemometric tools to identify samples with PCA and SVM-DA. All samples can be correctly identified by SVM-DA models. These results demonstrate the performance of terahertz spectroscopy couple with chemometrics methods to identify adulterated food.