Abstract
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 μM 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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Acknowledgements
This work was supported by the National Natural Science Foundation of China (81472001, 31400851 & 21705092), Program of Science and Technology in Quanzhou City (2018Z132), the Minjiang Scholars Program of Fujian Province, the Tongjiang Scholars Program of Quanzhou City, the Fourth Health Education Joint Development Project of Fujian Province (WKJ-2016-2-36) and the Fujian Educational Committee (JAT170487).
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Chen, X., Liu, Q., Liu, M. et al. Protein-templated Fe2O3 microspheres for highly sensitive amperometric detection of dopamine. Microchim Acta 185, 340 (2018). https://doi.org/10.1007/s00604-018-2876-5
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DOI: https://doi.org/10.1007/s00604-018-2876-5