RAPID DETERMINATION OF PROTEIN IN MILLET BY FOURIER TRANSFORM NEAR-INFRARED(FTNIR)DIFFUSE REFLECTANCE SPECTROSCOPY

<正> In this paper,the Fourier transform near-infrared(FTNIR)diffuse reflectance spectroscopy is applied for therapid determination of protein in millet.The partial least-squares(PLS)regression is successfully used as aneffective multivariate calibration technique.The calibration set is composed of 20 standard millet samples thatthe protein contents were determined by the traditional Kjeldahl method.The optimal model dimension is foundto be 5 by cross-validation.22 millet samples were determined by the proposed FTNIR-PLS method.Thecorrelation coefficient between the concentration values obtained by the FTNIR-PLS method and the traditionalKjeldahl method is 0.9805.The standard error of prediction(SEP)is 0.28% and the mean recovery is 100.2%.Theproposed method has been successfully applied for the routine analysis of protein in about 10,000 grain samples.