Graphene oxide modified screen-printed electrode for highly sensitive and selective electrochemical detection of ciprofloxacin residues in milk

被引:25
作者
Pan, Ming [1 ,2 ]
Guo, Peipei [2 ]
Liu, Haifeng [1 ,2 ]
Lu, Jiawei [2 ]
Xie, Qiubo [1 ,2 ]
机构
[1] Guangdong Inst Modern Agr Equipment, 261 Wushan Rd, Guangzhou 510630, Peoples R China
[2] Guangzhou Joinken Network Technol Dev Co Ltd, Guangzhou 510630, Peoples R China
关键词
Graphene oxide; Screen-printed electrode; Electrochemical analysis; Ciprofloxacin; ANTIBIOTICS; SENSOR;
D O I
10.1186/s40543-021-00309-y
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The monitoring of antibiotic residues in foodstuffs by using rapid detection method is essential for food safety. In this work, the electrochemical sensor was developed by modification of screen-printed carbon electrode with graphene oxide, and then the ciprofloxacin (CIP) was detected based on the complexation of CIP with Mn2+. On modified electrode, the anodic stripping peak current response of Mn2+ was prohibited in the presence of CIP, and a peak current response of the complex was occurred. Thus, the peak current response of the complexation peak was employed as the indicating signal for CIP determination, which was more sensitive than the direct electrochemical oxidation response of CIP. Parameters that affect the signal response have been investigated in method. Under the optimum conditions, the peak current of the complexation peak was linearly correlated with the CIP content in the milk sample solution at 1.0 to 8.0 mu M, and the linear correlation coefficients (R-2) was 0.994. The limits of detection (LOD) was 0.30 mu M. Recoveries of CIP in milk sample were ranged from 81.0 to 95.4% with relative standard deviations (RSDs) below 4.6%. The method showed high selectivity and sensitive, good reproducibility, indicated that this method has potential to be applied in CIP residue analysis.
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页数:7
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