期刊
MICROCHIMICA ACTA
卷 185, 期 7, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-018-2876-5
关键词
Protein templated-method; Egg white; Fe2O3 microspheres; Olive-like morphology; Catalytic activity; DA oxidization; Amperometric detection; Human urine samples
资金
- National Natural Science Foundation of China [81472001, 31400851, 21705092]
- Program of Science and Technology in Quanzhou City [2018Z132]
- Minjiang Scholars Program of Fujian Province
- Tongjiang Scholars Program of Quanzhou City
- Fourth Health Education Joint Development Project of Fujian Province [WKJ-2016-2-36]
- Fujian Educational Committee [JAT170487]
The authors describe an amperometric sensor for dopamine (DA) by employing olive-like Fe2O3 microspheres (OFMs) as the electrocatalyst for DA oxidization. The OFMs were prepared by using a protein templated method. The structure and properties of the OFMs were characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive x-ray spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The OFMs possess excellent catalytic activity towards DA oxidization due to their unique morphology. The sensor responds to DA within less than 5 s. The sensor, best operated at a voltage of +0.2 V (vs. SCE) responds linearly in the 0.2 to 115 mu M DA concentration range and has a 30 nM detection limit. The selectivity, reproducibility and long-term stability of the sensor are acceptable. It performs well when applied to spiked human urine samples.
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