Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 157, Issue -, Pages 50-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.12.017
Keywords
Two-dimensional hetero-spectral IR/NIR correlation spectroscopy; Multi-way partial least squares discriminant analysis (NPIS-DA); Adulterated milk; Melamine
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Funding
- China Natural Science Foundation Committee [31201359, 81471698]
- Natural Science Foundation of Tianjin [14JCYBJC30400]
- Tianjin Science and Technology Development Fund of Higher School [20140621]
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A new approach for discriminant analysis of adulterated milk is proposed based on two-dimensional (2D) hetero-spectral near-infrared (NIR) and mid-infrared (IR) correlation spectroscopy along with multi-way partial least squares discriminant analysis (NPLS-DA). NIR transmittance spectra and IR attenuated total reflection spectra of pure milk and adulterated milk with level of melamine varying from 0.03 to 3 g.L-1 were collected at room temperature. The synchronous 2D hetero-spectral IR/NIR correlation spectra of all samples were calculated to build a discriminant model to classify adulterated milk and pure milk. Also, the NPLS-DA models were built based on synchronous 2D homo-spectral NIR/NIR and IR/IR correlation spectra, respectively. Comparison results showed that the NPLS-DA model could provide better results using 2D hetero-spectral IR/NIR correlation spectra than using 2D homo-spectral NIR/NIR and 2D IR/IR correlation spectra. (C) 2015 Elsevier B.V. All rights reserved.
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