An electrocatalytic oxidation and voltammetric method using a chemically reduced graphene oxide film for the determination of caffeic acid.
The present work describes the characterization of a chemically reduced graphene oxide (CRGO) modified glassy carbon electrode (GCE) for electrochemical investigation of caffeic acid (CA). Cyclic voltammetry (CV), differential pulse voltammetry (DPV), amperometry, and electrochemical impedance spectroscopy (EIS) techniques were used to characterize the properties of the electrode. There was an obvious enhancement of the current response and a decreased over potential for the oxidation of CA. The interfacial electron transfer rate of CA was studied by EIS. Under optimal conditions, the CRGO displayed a linear response range of 1×10(-8) to 8×10(-4) M and the detection limit was 2×10(-9) M (S/N=3), with a sensitivity of 192.21 μA mM(-1) cm(-2) at an applied potential of +0.2V (vs. Ag/AgCl reference), which suggests that the CRGO is a promising sensing materials for the electrochemical investigation of CA. The results showed the good sensitivity, selectivity and high reproducibility of the CRGO modified electrode. Moreover, this modified electrode was further applied to investigate the CA in real samples of wine with satisfactory results.
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.
A T Ezhil
AT
Vilian
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC; Department of Botany and Microbiology, College of Science, King Saud University, Riyadh-11451, Saudi Arabia. Electronic address: smchen78@ms15.hinet.net.
Shen-Ming
SM
Chen
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.
Ying-Hui
YH
Chen
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh-11451, Saudi Arabia.
M Ajmal
MA
Ali
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh-11451, Saudi Arabia.
Fahad M A
FM
Al-Hemaid
D002109:Caffeic Acids / Q000032:analysis*; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014920:Wine / Q000032:analysis*
D002109:Caffeic Acids; D010087:Oxides; D006108:Graphite; C040048:caffeic acid
Bionanotechnology; Caffeic acid; Chemically reduced graphene oxide; Electrochemical impedance spectroscopy; Electrochemistry