期刊
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
卷 57, 期 -, 页码 279-287出版社
ELSEVIER
DOI: 10.1016/j.msec.2015.07.025
关键词
Gallic acid; Iron oxide; Electra-reduced graphene oxide; Electrochemical sensor
资金
- National Natural Science Foundation of China [21275127]
- Program for New Century Excellent Talents in Fujian Province University [JA12204]
- Key Research Foundation of Fujian Education Department [JA11166]
A highly sensitive electrochemical sensor for gallic acid (GA), an important polyphenolic compound, was fabricated using the hybrid material of chitosan (CS), fishbone-shaped Fe2O3 (fFe(2)O(3)), and electrochemically reduced graphene oxide (ERGO) as the sensing matrix. The electrochemical characterization experiments showed that the CS-fFe(2)O(3)-ERGO modified glassy carbon electrode (CS-fFe(2)O(3)-ERGO/GCE) had large surface area, excellent electronic conductivity and high stability. The GA presented a superior electrochemical response on CS-fFe(2)O(3)-ERGO/GCE in comparison with the single-component modified electrode. The electrochemical mechanism and optimal test conditions of GA on the electrode surface were carefully investigated. Under the optimal conditions, the oxidation peak currents in differential pulse voltammetry (DPV) experiments exhibited a good linear relationship with the logarithmic values of GA concentration over the range from 1.0 x 10(-6) M to 1.0 x 10(-4) M. Based on signal-to-noise (S/N) characteristic of 3, the detection limit was estimated to be 1.5 x 10(-7) M. The proposed sensor has also been applied for estimating the antioxidant capacity index of real samples of red and white wines. (C) 2015 Elsevier B.V. All rights reserved.
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