期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 412, 期 8, 页码 1893-1899出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-020-02440-y
关键词
Superoxide detection; Visual ECL detection; CuInZnS QDs
资金
- National Natural Science Foundation of China [21005029] Funding Source: Medline
- Thirteenth Five Year Project of the Science and Technology Research in the Education Department of Jilin Province, China [JJKH20180125KJ] Funding Source: Medline
- Youth Science Fund of Jilin Province [20140520081JH] Funding Source: Medline
Superoxide dismutase (SOD), also known as liver protein, is a substance widely distributed in various biological cells. It has the function of catalyzing the disproportionation reaction of superoxide free radicals. SOD can form an antioxidant chain together with peroxidase, catalase, and other substances in the body of organisms, and thus, is one of the indispensable important substances in the body of organisms. In this work, we provided a simple and fast visual electrochemiluminescence (ECL) sensor for SOD detection. CuInZnS quantum dots (QDs) worked as the ECL luminophore with hydrogen peroxide as co-reactant. In the sensing process, SOD and CuInZnS QDs on a glassy carbon electrode (GCE) competed with each other for hydrogen peroxide to produce superoxide during electrochemical luminescence, thus quenching the ECL signal of CuInZnS QDs. The proposed sensor can quantify SOD with a limit of detection (LOD) of 0.03 mu g/mL. In addition, the change in the CuInZnS QDs ECL signal was easily observed with a smartphone camera. The results indicated that this sensor could effectively work in the detection of SOD in human blood. Graphical abstract
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