Abstract
A voltammetric sensor for both the individual and the simultaneous determination of ascorbic acid (AA), uric acid (UA) and folic acid (FA) is described. It is based on a glassy carbon electrode (GCE) that was modified with bentonite (Bnt) that was first functionalized with cysteine (Cys) to which gold nanoparticles were linked. The resulting material (referred to as Au-Cys-Bnt) and the other materials were characterized by UV-vis spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray analysis and electrochemical methods. The XRD peak positions of bentonite and Cys-functionalized bentonite prove the incorporation of Cys into bentonite. The XPS spectrum of Au-Cys-Bnt confirms the interaction of gold nanoparticles with the thiol group of Cys. The modified GCE displays high electrocatalytic activity for the oxidation of AA, UA and FA, typically at 0.19, 0.41, and 0.73 V (vs. SCE), respectively. Differential pulse voltammetric data show a linear response that covers the 1 μM to 25 mM concentration range for AA, the 1 to 200 μM concentration range for UA, and two linear ranges for FA, one from 5 to 100 μM and one from 100 μM to 1.5 mM. The sensor was applied to the determination of AA, UA and FA in (spiked) multi-vitamin syrup, bird serum and milk samples.
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Schematic of a sensor for simultaneous and individual electrochemical determination of ascorbic, uric, and folic acids in real samples. The sensor consists of a glassy carbon electrode that was modified with a nanocomposite prepared from bentonite that was first functionalized with cysteine to which gold nanoparticles were linked.
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Acknowledgements
Financial support from CSIR (01(2708)/13/EMR-II), UGC (42-271/2013 (SR)) and DST (SR/NM/NS-2012/2013(G)), New Delhi is gratefully acknowledged. DKY acknowledges UGC for junior research fellowship (JRF). We thank Prof. O. N. Srivastava, Banaras Hindu University for SEM and TEM studies. We thank Ms. Dipika Roy for her assistance during the initial stage of this study in synthesis and characterization of the material and in the electrocatalysis of folic acid. We thank the reviewers for their valuable suggestions to improve the manuscript.
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Yadav, D.K., Gupta, R., Ganesan, V. et al. Individual and simultaneous voltammetric determination of ascorbic acid, uric acid and folic acid by using a glassy carbon electrode modified with gold nanoparticles linked to bentonite via cysteine groups. Microchim Acta 184, 1951–1957 (2017). https://doi.org/10.1007/s00604-017-2186-3
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DOI: https://doi.org/10.1007/s00604-017-2186-3