Identification of melamine in milk using mid-infrared spectrometry

Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State University of Veterinary Medicine”, St. Petersburg, Russia

^* Corresponding author: kalyuzhnaya.t.v@mail.ru

Abstract

The paper presents a study of the infrared spectra of milk with melamine in the middle spectral range. The presence of absorption bands in the infrared spectra of a standard sample of melamine, milk without it and with its addition in different concentrations was analyzed in a comparative aspect. The presence of absorption bands of varying degrees of intensity in the infrared spectra has been established. It was revealed that the presence of melamine in milk can be identified by an absorption band in the region of 810 cm^-1. The absence of this absorption band in the infrared spectra of milk with melamine concentrations of 0.1 and 0.5 mg/kg was determined. It was substantiated that the intensity of absorption bands in the infrared spectra depended on the concentration of melamine in milk. The use of spectrometry in the mid-infrared range to detect adulteration of milk has been proposed.