IDENTIFICATION AND AUTHENTICATION OF COW’S MILK POWDER USING A SMARTPHONE AND CHEMOMETRIC ANALYSIS

Abstract

The possibility of identi cation and authentication of cow’s milk powder by the method of chemical colorimetry of the samples’ own uorescence using a smartphone camera and chemometric analysis is shown. A fundamental test device for direct colorimetric analysis of powdered milk is proposed, excluding the stage of sample preparation. Fluorescence excitation was carried out with a portable source of monochromatic UV radiation (λ = 365 nm). Colorimetric parameters of powdered milk uorescence in RGB space were recorded using a smartphone camera. We used chemometric processing of the calculated analytical signal, which made it possible to reduce the analysis time and visualize the study data. The evaluation of the data array of uorescence colorimetric parameters (RGB) was carried out by principal component analysis (PCA) and hierarchical clustering analysis (HCA) using the XLSTAT software.