Qualitative and Quantitative Analyses of Potassium Sorbate in Milk Powder using Terahertz Spectra

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Journal of Applied Spectroscopy, Vol. 87, No. 4, September, 2020 (Russian Original Vol. 87, No. 4, July–August, 2020)

QUALITATIVE AND QUANTITATIVE ANALYSES OF POTASSIUM SORBATE IN MILK POWDER USING TERAHERTZ SPECTRA F. Y. Lian,a,b* M. X. Fu,a,b and D. G. Xua,b

UDC 543.42

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 (

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