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Interaction between amorphous zirconia nanoparticles and graphite: electrochemical applications for gallic acid sensing using carbon paste electrodes in wine.

Chikere, Chrys. O.; Faisal, Nadimul Haque; Kong-Thoo-Lin, Paul; Fernandez, Carlos

Authors

Chrys. O. Chikere



Abstract

Amorphous zirconium oxide nanoparticles (ZrO2) have been used for the first time, to modify carbon paste electrode (CPE) and used as a sensor for the electrochemical determination of gallic acid (GA). The voltammetric results of the ZrO2 nanoparticles-modified CPE showed efficient electrochemical oxidation of gallic acid, with a significantly enhanced peak current from 261 µA ± 3 to about 451 µA ± 1. The modified surface of the electrode and the synthesised zirconia nanoparticles were characterised by scanning electrode microscopy (SEM), Energy-dispersive x-ray spectroscopy (EDXA), X-ray powdered diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). Meanwhile, the electrochemical behaviour of GA on the surface of the modified electrode was studied using differential pulse voltammetry (DPV), showing a sensitivity of the electrode for GA determination, within a concentration range of 1 × 10−6 mol L−1 to 1 × 10−3 mol L−1 with a correlation coefficient of R2 of 0.9945 and a limit of detection of 1.24 × 10−7 mol L−1 (S/N = 3). The proposed ZrO2 nanoparticles modified CPE was successfully used for the determination of GA in red and white wine, with concentrations of 0.103 mmol L−1 and 0.049 mmol L−1 respectively.

Citation

CHIKERE, C.O., FAISAL, N.H., KONG-THOO-LIN, P. and FERNANDEZ, C. 2020. Interaction between amorphous zirconia nanoparticles and graphite: electrochemical applications for gallic acid sensing using carbon paste electrodes in wine. Nanomaterials [online], 10(3), article ID 537. Available from: https://doi.org/10.3390/nano10030537

Journal Article Type Article
Acceptance Date Mar 10, 2020
Online Publication Date Mar 17, 2020
Publication Date Mar 31, 2020
Deposit Date Mar 17, 2020
Publicly Available Date Mar 17, 2020
Journal Nanomaterials
Electronic ISSN 2079-4991
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 10
Issue 3
Article Number 537
DOI https://doi.org/10.3390/nano10030537
Keywords Amorphous materials; Zirconium oxide nanoparticles; Carbon paste electrode; Phenolic acid; Gallic acid; Electrochemistry; Cyclic voltammetry; Differential pulse voltammetry
Public URL https://rgu-repository.worktribe.com/output/881118

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