Abstract
Lanthanum oxide nanomaterials were decorated with carbon black (CB) and grafted with a poly(acrylic acid) nanogel to obtain a composite material (CB-g-PAA/La2O3) for simultaneous determination of acetaminophen (AMP), naproxen (NPX), and theophylline (TPH). The nanogel was synthesized by in-situ free radical polymerization. The composite was dropped onto a glassy carbon electrode (GCE), and the modified GCE displays robust electrocatalytic activity towards AMP, NPX, and TPH, with voltammetric signals that are enhanced compared to a bare GCE. Features of merit for AMP, NPX, and TPH, respectively, include (a) peak potentials of 0.42, 0.85 and 0.12 V (vs. Ag/AgCl), (b) linear ranges from 0.05–887, 0.05–884, and 0.02–888 μM, and (c) detection limits of 20, 35, and 15 nM. The practical applicability of the CB-g-PAA/La2O3/GCE was illustrated by analyzing serum and urine samples.
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Schematic presentation of simultaneous electrochemical sensing of acetaminophen (AMP), naproxen (NPX), and theophylline (TPH) in real sample analysis using poly(acrylic acid) nanogel covalently grafted onto a carbon black/La2O3 composite (CB-g-PAA/La2O3/GCE).
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Acknowledgements
This project was supported by the Ministry of Science and Technology (MOST 106-2113-M-027-003), Taiwan, ROC.
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Mutharani, B., Ranganathan, P., Chen, SM. et al. Simultaneous voltammetric determination of acetaminophen, naproxen, and theophylline using an in-situ polymerized poly(acrylic acid) nanogel covalently grafted onto a carbon black/La2O3 composite. Microchim Acta 186, 651 (2019). https://doi.org/10.1007/s00604-019-3752-7
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DOI: https://doi.org/10.1007/s00604-019-3752-7