Two-dimensional hetero-spectral mid-infrared and near-infrared correlation spectroscopy for discrimination
Renjie Yang1, Rong Liu2, Guimei Dong1
1College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China.
Abstract:
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.
More Related Videos
Related Concept Videos
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
IR Frequency Region: Fingerprint Region
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
The ATR process begins by directing a beam...
IR and UV–Vis Spectroscopy of Carboxylic Acids
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...


