Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 224, Issue -, Pages 915-925Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.10.101
Keywords
Gallic acid; Uric acid; Gold microclusters; Functionalized graphene; Glassy carbon electrode
Funding
- National Natural Science Foundation of China (NSFC) [21005021, 21375152]
- Guangdong Provincial Science and Technology Project [2013B040402010, 2010B020316010]
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A facile and ultrasensitive sensor based on gold microclusters (AuMCs) electrodeposited on sulfonate functionalized graphene (SF-GR) was fabricated, and applied for the simultaneous determination of gallic acid (GA) and uric acid (UA). Taking advantage of the unique plane structure of the functionalized graphene (GR), the AuMCs were successfully electrodeposited on functionalized GR immobilized on the surface of a GCE. The results of scanning electron microscope (SEM) and energy spectrum analysis illustrated that AuMCs were deposited on the functionalized GR film. In comparison with the bare GCE, the pristine AuMCs and the pristine SF-GR modified electrode, AuMCs/SF-GR/GCE exhibited excellent electrochemical oxidation toward GA and UA. In addition, the two compounds were separated completely in 0.10 M citric acid-sodium citrate buffer (pH 4.0) by differential pulse voltammetry (DPV) under optimum conditions. The anodic current was linearly related with 0.05-8.0 mu M GA and 0.2-50.0 mu M UA, with the detection limit of 10.7 nM and 0.12 mu M, respectively. Furthermore, AuMCs/SF-GR/GCE was successfully applied to the independent determination of GA in black tea and Cortex mouton as well as the simultaneous determination of GA and UA in urine samples. (C) 2015 Elsevier B.V. All rights reserved.
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