AbstractThe 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. Graphical abstractOlive-like Fe2O3 microspheres (OFMs), synthesized using egg white as template, display excellent catalytic activity towards dopamine (DA) oxidization due to their unique morphology. They were applied for DA detection using the amperometric technique. The electrochemical sensor exhibited a high sensitivity and a 30 nM detection limit. DAQ: dopaquinone.

中文翻译：

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蛋白质模板化的 Fe2O3 微球用于多巴胺的高灵敏度电流检测

摘要作者描述了一种多巴胺 (DA) 电流传感器，采用橄榄状 Fe2O3 微球 (OFM) 作为 DA 氧化的电催化剂。OFMs 是通过使用蛋白质模板方法制备的。通过扫描电子显微镜、X 射线粉末衍射、能量色散 X 射线光谱、循环伏安法和电化学阻抗谱对 OFM 的结构和性质进行了表征。由于其独特的形态，OFM 对 DA 氧化具有优异的催化活性。传感器在不到 5 秒内响应 DA。该传感器在 +0.2 V（相对于 SCE）的电压下运行最佳，在 0.2 至 115 μMD DA 浓度范围内线性响应，检测限为 30 nM。传感器的选择性、重现性和长期稳定性是可以接受的。当应用于加标人尿样品时，它表现良好。图解摘要以蛋清为模板合成的橄榄状 Fe2O3 微球 (OFM) 由于其独特的形态而对多巴胺 (DA) 氧化显示出优异的催化活性。它们被应用于使用电流分析技术的 DA 检测。电化学传感器表现出高灵敏度和 30 nM 的检测限。DAQ：多巴醌。