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Unfolded partial least squares/residual bilinearization combined with the Successive Projections Algorithm for interval selection: enhanced excitation-emission fluorescence data modeling in the presence of the inner filter effect

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Abstract

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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Acknowledgments

The authors acknowledge CAPES (PhD scholarship), CNPq (research fellowships) Universidad Nacional del Litoral (Project CAI + D 2012 No. 11–11), CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas, Project PIP 455), and ANPCyT (Agencia Nacional de Promoción Científica y Tecnológica, Project PICT 2011–0005 for financial support. A.V.S. acknowledges and thanks CONICET for her fellowship.

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Authors and Affiliations

  1. Departamento de Química, Laboratório de Automação e Instrumentação em Química Analítica e Quimiometria (LAQA) Universidade Federal da Paraíba, CCEN, Caixa Postal 5093, CEP, 58051-970, João Pessoa, PB, Brasil

    Adriano de Araújo Gomes & Mario Cesar U. de Araújo

  2. Laboratorio de Desarrollo Analítico y Quimiometría (LADAQ), Cátedra de Química Analítica I, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Santa Fe, S3000ZAA, Argentina

    Agustina V. Schenone & Héctor C. Goicoechea

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  1. Adriano de Araújo Gomes
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  2. Agustina V. Schenone
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  3. Héctor C. Goicoechea
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  4. Mario Cesar U. de Araújo
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Correspondence to Héctor C. Goicoechea or Mario Cesar U. de Araújo.

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de Araújo Gomes, A., Schenone, A.V., Goicoechea, H.C. et al. Unfolded partial least squares/residual bilinearization combined with the Successive Projections Algorithm for interval selection: enhanced excitation-emission fluorescence data modeling in the presence of the inner filter effect. Anal Bioanal Chem 407, 5649–5659 (2015). https://doi.org/10.1007/s00216-015-8745-8

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  • DOI: https://doi.org/10.1007/s00216-015-8745-8

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