Detection of melamine in milk powder using a portable near-infrared spectroscopy based on MEMS micro-mirror

• 1、School of Food Science and Technology, Jiangnan University, Wuxi, 214122
• 2、Wuxi Wio Tech Co., LTD. Wuxi 214122

Abstract：In order to identify and quantitatively detect the melamine in milk powder, build a portable optical instrument. A spectral platform of Fourier transform near infrared spectroscopy based on MEMS micro-mirror, handheld probe, optical fiber and sample cell were constructed to a Fourier transform near infrared spectrometer. The near infrared diffuse reflectance spectra of mixed samples using milk powder and melamine with different proportions are collected from 1000 to 2500 nm. The reliability of the established PLS model is verified by cross-validation and external test. In 1400~1600 nm and 1900~2400 nm band, using the second derivative+Savitzky-Golay 9 spots smoothing pretreatment method and the main component was 5, the predictive ability of the regression model was the best. The calibrate correlation coefficient of the quantitative analysis model was 0.9652 and the root mean square error of calibration was 8.22. The predicted deviation of external validation results was under 5%. The spectrometer is small and the results shows that the portable near infrared spectroscopy technique call be used for rapid and quantitative identification of adulterated milk powder.

Keywords： near infrared spectroscopy milk powder melamine micro-electro mechanical technology