Abstract：Near-infrared spectroscopy combined with chemometrics was used to investigate the feasibility of identifying different brands of soymilk powder and the counterfeit soymilk powder products. For this purpose, partial least squares-discriminant analysis (PLS-DA), linear discriminant analysis (LDA) and back-propagation neural network (BPNN) were employed as pattern recognition methods to class ify soymilk powder samples. The performances of different pretreatments of raw spectra were also compared by PLS-DA. PLS-DA models based on De-trending and multiplicative scatter correction (MSC)combined with De-trending(MSC+De-trending) spectra obtained best results with 100% prediction accuracy, respectively. Six and seven optimal wavenumbers selected by x-loading weights of the best two PLS-DA models were used to build LDA and BPNN models. Results showed that BPNN performed best and correctly classified 100% of the soymilk powder samples for both the calibration and the prediction set. The overall results indicated that NIR spectroscopy could accurately identify branded and counterfeit soymilk powder products.
[1] Anderson R L, Wolf W J. J. Nutr., 1995, 125(3): S581. [2] Garcia M C, Torre M, Marina M L, et al. Crit. Rev. Food Sci., 1997, 37(4): 361. [3] Riaz M N. Cereal Food World, 1999, 44: 88. [4] Schryver T. Cereal Food World, 2002, 47: 185. [5] Wang H J, Murphy P A. J. Agric. Food Chem., 1996, 44(8): 2377. [6] Sertovic E, Mujic I, Jokic S, et al. Rom. Biotech. Lett., 2012, 17(2): 7151. [7] Zhang Y, Guo S T, Liu Z S, et al. J. Agric. Food Chem., 2012, 60(30): 7457. [8] Otieno D O, Rose H, Shah N P, et al. Food Chem., 2007, 105(4): 1642. [9] Liu F, Zhang F, Jin Z L, et al. Anal. Chim. Acta, 2008, 629(1-2): 56. [10] Liu F, Nie P C, Huang M, et al. Sci. China Inform. Sci. 2011, 54(3): 598. [11] Liu F, He Y. Food Res. Int., 2008, 41(5): 562. [12] Liu F, He Y, Wang L, et al. Anal. Chim. Acta, 2008, 615(1): 10. [13] Blanco M, Coello J, Iturriaga H, et al. Analyst, 1998, 123(8): 135. [14] Freitas M P, Sabadin A, Silva L M, et al. J. Pharmaceut. Biomed., 2005, 39(1-2): 17. [15] Balabin R M, Safieva R Z, Lomakina E I, et al. Anal. Chim. Acta, 2010, 671(1-2): 27. [16] Bevilacqua M, Bucci R, Magri A D, et al. Anal. Chim. Acta, 2012, 717: 39. [17] Luna A S, da Silva A P, Pinho J S, et al. Spectrochim. Acta A MolBiomol. Spectrosc., 2013, 100: 115. [18] Morsy N, Sun D W. Meat Sci., 2013, 93(2): 292. [19] Shao Y N, He Y, Bao Y D, et al. Int. J. Food Prop., 2009, 12(3): 644. [20] Ribeiro J S, Ferreira M M, Salva T J, et al. Talanta, 2011, 83(5): 1352.
