Application of infrared spectrometry in the determination of melamine and urea in milk powder
BAI Jing1*, WANG Hui2
1 (College of Chemical Engineering, Henan Vocational College of Applied Technology, Zhengzhou 450042, China) 2 (College of nursing, Henan Vocational College of applied technology, Zhengzhou 450042, China)
Abstract: A method for rapid identification of melamine and urea in milk powder was established by using Fourier transform infrared spectroscopy (FTIR) combined with second-order least squares (LS). Firstly, the characteristic absorption peaks were determined by spectral analysis, then the second-order least square method was used to analyze the significance of absorption and adulteration concentration of characteristic absorption peaks by SPSS software. Then, combining with regression analysis, the linear model for determination of melamine and urea was established by removing abnormal points and increasing fitting degree. The results showed that the linear correlation of the determination of melamine and urea in milk powder by infrared spectroscopy was as high as 0.999 2 and 0.999 3, respectively. And the corresponding minimum detection limit was 0.744 2 g/100g and 0.042 5 g/100g. The method developed here has high accuracy, fast identification speed and low detection limit. So, it is of great significance for rapid identification of adulterated milk powder.
白静,王会. 红外光谱法测定奶粉中三聚氰胺和尿素[J]. 食品与发酵工业, 2020, 46(8): 267-272.
BAI Jing,WANG Hui. Application of infrared spectrometry in the determination of melamine and urea in milk powder[J]. Food and Fermentation Industries, 2020, 46(8): 267-272.
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