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Chemometrics-assisted excitation-emission fluorescence spectroscopy for simultaneous determination of ethoxyquin and tert-butylhydroquinone in biological fluid samples

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Abstract

A novel method applying simple, rapid, effective and inexpensive excitation-emission matrix (EEM) fluorescence spectroscopy coupled with second-order calibration method for simultaneous determination of ethoxyquin (EQ) and tert-butylhydroquinone (TBHQ) contents in biological fluid samples was developed. After a simple data preprocessing that was to insert zeros below the first-order Rayleigh scattering, the second-order calibration method based on the alternating normalization-weighed error (ANWE) algorithm was used to deal with EEM data. Via the introduced “second-order advantage”, the individual concentrations of the analytes of interest could be obtained even in the presence of uncalibrated interferences. The experimental concentration ranges for the analytes were as follows: EQ, from 4.58 to 20.6 μg mL−1 in plasma and from 6.87 to 20.6 μg mL−1 in urine; TBHQ, from 4.49 to 20.2 μg mL−1 in plasma and from 6.73 to 22.4 μg mL−1 in urine. The recoveries from spiked biological fluid samples were in the ranges of 92.8%–106.2% for EQ and 94.6%–107.2% for TBHQ. These results demonstrate that the three-dimensional EEM fluorescence with second-order calibration method is a powerful tool for obtaining both EQ and TBHQ quantitative results in plasma and urine samples, and could be applied to more complex matrices.

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Authors and Affiliations

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China

    Yao Chen, HaiLong Wu, JianYao Wang, XiaoHua Zhang, Yong Li, ShuRong Zhang & Ru-Qin Yu

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  1. Yao Chen
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  2. HaiLong Wu
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  3. JianYao Wang
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  4. XiaoHua Zhang
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  5. Yong Li
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  6. ShuRong Zhang
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  7. Ru-Qin Yu
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Correspondence to HaiLong Wu.

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Chen, Y., Wu, H., Wang, J. et al. Chemometrics-assisted excitation-emission fluorescence spectroscopy for simultaneous determination of ethoxyquin and tert-butylhydroquinone in biological fluid samples. Sci. China Chem. 56, 664–671 (2013). https://doi.org/10.1007/s11426-012-4765-9

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  • DOI: https://doi.org/10.1007/s11426-012-4765-9

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