5 years ago

Amperometric ascorbic acid biosensor based on carbon nanoplatelets derived from ground cherry husks

Amperometric ascorbic acid biosensor based on carbon nanoplatelets derived from ground cherry husks
In this work, a novel amperometric biosensor based on carbon nanoplatelets derived from ground cherry (Physalis peruviana) husks (GCHs-CNPTs) is reported for the sensitive and selective detection of ascorbic acid (AA). The structure of the nanoplatelets, the oxygen-containing groups and edge-plane-like defective sites (EPDSs) on the GCHs-CNPTs were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The presence of GCHs-CNPTs with a high density of EPDSs effectively enhances the electron transfer between AA and the glassy carbon electrode (GCE), and thus induces a substantial decrease in the overvoltage for AA oxidation compared with both a bare GCE and a GCE modified with carbon nanotubes (CNTs/GCE). In particular, an amperometric biosensor based on GCHs-CNPTs exhibited a wider linear range (0.01–3.57mM), higher sensitivity (208.63μAmM1 cm2), a lower detection limit (1.09μM, S/N=3) and better resistance to fouling for AA determination compared to a CNT-modified GCE. The great potential of the GCHs-CNPTs/GCE for practical and reliable AA analysis was demonstrated by the successful determination of AA in samples taken from a medical injection dose and a soft drink.

Publisher URL: www.sciencedirect.com/science

DOI: S1388248117302205

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