QUALITATIVE AND QUANTITATIVE ANALYSIS OF POTASSIUM SORBATE IN MILK POWDER USING TERAHERTZ SPECTRA
Abstract
Using the terahertz time-domain spectroscopy system (THz-TDS), the potassium sorbate content in milk powder has been investigated. Firstly, the THz time-domain spectra of the samples were transformed into frequency spectra by Fourier transform, and then, through a set of simplified formulas of the optical parameters, the THz absorption spectra and refractive index spectra were obtained. Based on the characteristic absorption peak of potassium sorbate, a quantitative analysis model of potassium sorbate in milk powder was constructed using Ordinary Least Squares (OLS) linear regression. In the case of low content (<1%) of potassium sorbate, a special THz absorption band (0.887-1.000 THz) was selected to construct a Partial Least Squares (PLS) model that is called Sub-PLS. In addition, for qualitative analysis, we used partial least squares discrimination analysis (PLS-DA). Experimental results show that the proposed Sub-PLS model is superior to the PLS mode based on full spectrum in accuracy, and the proposed PLS-DA is superior to other nonlinear regression methods such as support vector machine and neural network.
Keywords
THz time-domain spectroscopy,
potassium sorbate,
ordinary least squares,
partial least squares,
partial least squares discrimination analysis
Supporting agencies: This work was supported by the Key scientific research projects of institutions of higher learning (18A51003), Henan, China, Ministry of Education, Zhengzhou, China, and the National Natural Science Foundation under Grant 61805072, and the National Key Research and Development Program of China under Grant 2017YFD0401003. We thank Lijian Zhang, postgraduate, from Henan University of Technology, for helping us in some of the experiments. We also thank Hongyi Ge and Yuying Jiang, who worked for Henan University of Technology, for suggestions in the preparation of the manuscript. The authors declare no conflict of interest.
About the Authors
F. Y. Lian
Key Laboratory of Grain Information Processing and Control, Henan University of Technology, Ministry of Education; Key Laboratory of Henan Province for Grain Photoelectric Detection and Control, Henan University of Technology
China
China
Zhengzhou Henan, 450001
Zhengzhou, 45001
M. X. Fu
Key Laboratory of Grain Information Processing and Control, Henan University of Technology, Ministry of Education; Key Laboratory of Henan Province for Grain Photoelectric Detection and Control, Henan University of Technology
China
China
Zhengzhou Henan, 450001
Zhengzhou, 45001
D. G. Xu
Key Laboratory of Grain Information Processing and Control, Henan University of Technology, Ministry of Education; Key Laboratory of Henan Province for Grain Photoelectric Detection and Control, Henan University of Technology
China
China
Zhengzhou Henan, 450001
Zhengzhou, 45001
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Review
For citations:
Lian F.Y., Fu M.X., Xu D.G. QUALITATIVE AND QUANTITATIVE ANALYSIS OF POTASSIUM SORBATE IN MILK POWDER USING TERAHERTZ SPECTRA. Zhurnal Prikladnoii Spektroskopii. 2020;87(4):682(1)-682(10).
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