Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 407, Issue 19, Pages 5649-5659Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-015-8745-8
Keywords
Interval selection; Successive projections algorithm; Unfolded-partial least squares; Second order calibration; Inner filter effect
Funding
- CAPES
- CNPq, Universidad Nacional del Litoral [11-11]
- CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas) [PIP 455]
- ANPCyT (Agencia Nacional de Promocion Cientifica y Tecnologica) [PICT 2011 0005]
- CONICET
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The use of the successive projections algorithm (SPA) for elimination of uninformative variables in interval selection, and unfold partial least squares regression (U-PLS) modeling of excitation-emission matrices (EEM), when under the inner filter effect (IFE) is reported for first time. Post-calibration residual bilinearization (RBL) was employed against events of unknown components in the test samples. The inner filter effect can originate changes in both the shape and intensity of analyte spectra, leading to trilinearity losses in both modes, and thus invalidating most multiway calibration methods. The algorithm presented in this paper was named iSPA-U-PLS/RBL. Both simulated and experimental data sets were used to compare the prediction capability during: (1) simulated EEM; and (2) quantitation of phenylephrine (PHE) in the presence of paracetamol (PAR) (or acetaminophen) in water samples. Test sets containing unexpected components were built in both systems [a single interference was taken into account in the simulated data set, while water samples were added with varying amounts of ibuprofen (IBU), and acetyl salicylic acid (ASA)]. The prediction results and figures of merit obtained with the new algorithm were compared with those obtained with U-PLS/RBL (without intervals selection), and with the well-known parallel factors analysis (PARAFAC). In all cases, U-PLS/RBL displayed better EEM handling capability in the presence of the inner filter effect compared with PARAFAC. In addition, iSPA-U-PLS/RBL improved the results obtained with the full U-PLS/RBL model, in this case demonstrating the potential of variable selection.
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