Amperometric sensing of ascorbic acid by using a glassy carbon electrode modified with mesoporous carbon nanorods

Mikrochimica Acta
Xiuxiu LiMing Zhou

Abstract

Mesoporous carbon nanorods (MCNRs) were prepared from honey as the carbon source and by using crab (Brachyuran) shells as the hard template. The unique nanostructure of the MCNRs with their uniform mesoporous size, abundant defective sites and numerous oxygen-functional groups was characterized by nitrogen adsorption-desorption isotherms, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Cyclic voltammograms of a glassy carbon electrode (GCE) modified with MCNRs revel a higher peak current density and lower peak potential (-0.03 V vs. Ag/AgCl) for ascorbic acid (AA) electrooxidation compared to a conventional GCE and a carbon nanotube-modified GCE. Figures of merit for this sensor include (a) a wide linear range (10-2770 μM), (b) high electrochemical sensitivity (216.91 μA mM-1 cm-2) and (c) a low detection limit (2.3 μM). These compare favorably to the respective data for a CNT-modified GCE (50-2150 μM, 5.20 μA mM-1 cm-2 and 26.8 μM) and a plain GCE (100-2000 μM, 0.58 μA mM-1 cm-2 and 54.6 μM). The modified GCE was successfully applied to the determination of AA in (spiked) real samples including an injection, soft drinks and fresh lemon juice. Therefore, the n...Continue Reading

References

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