期刊
ELECTROANALYSIS
卷 30, 期 9, 页码 2085-2093出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201800218
关键词
Electrochemical detection; Signal amplification; Redox capacitor; Sulfonated polyaniline; Chloramphenicol
资金
- Scientific Research Foundation of Shaanxi Provincial Key Laboratory [15JS098, 16JS100]
In this work, a novel redox capacitor was designed for signal amplification in electrochemical detection. It was fabricated by co-electrodeposition of a conducting polymer, sulfonated polyaniline (SPAN) and chitosan on a glass carbon electrode, and its function was evaluated for being a localized source to transfer electron between FcCOOH (Fc) and Ru(NH3)(6)Cl-3 in solution via redox cycling. Furthermore, the electrochemical detection of chloramphenicol, a broad-spectrum antibiotic was performed using the redox capacitor in the presence of Fc. A significant amplification in cathodic current response of chloramphenicol was obtained through a continuous redox-cycling reaction. The performance of the amplifying signal responded linearly to chloramphenicol in a concentration range of 0.05 to 50.0molL(-1) with a low detection limit of 0.01molL(-1). The proposed approach exhibited good reproducibility and stability, and could be used for detection of chloramphenicol in eye drops by standard addition method with the recoveries from 96.5% to 103.0%.
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