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Electrochemical Formation of Nanostructured Gold Surfaces on Glassy Carbon for the Determination of Dopamine
Electroanalysis ( IF 2.7 ) Pub Date : 2018-03-15 , DOI: 10.1002/elan.201700665
Carlos Alberto Cevallos-Morillo 1 , Salvador G. Hernández-Vargas 1 , Julio C. Aguilar-Cordero 1
Affiliation  

Nanostructured gold surfaces were prepared by potentiostatic, potentiodynamic or galvanostatic Au electrodeposition on glassy carbon electrodes. The nanostructured gold electrodes (nsAu/GC) were used for the determination of dopamine (DA) in aqueous media. A directly proportional relationship was found between the peak current for DA (obtained by square wave voltammetry, SWV) and its concentration for all cases. However, the best performance for DA determination was attained with potentiodynamically electrodeposited surfaces. The SWV peak current was linearly dependent on DA concentration up to 10 μM, with a detection limit (3σ) of 0.57 μM, and a correlation coefficient (r) of 0.9966. A study on the effect of common interfering species such as ascorbic acid (AA) and uric acid (UA) on DA determination was also carried out. The use of a nanostructured surface gives rise to peaks for AA and UA that appear at 0.15–0.20 V above the peak potential for DA. The detection limit obtained for dopamine is below 1 μM in the presence of 0.1 mM AA and 0.1 mM UA. Thus, nanostructuring of glassy carbon surfaces with gold conveniently and easily improves the detection of DA in the presence of their principal interfering species.

中文翻译:

用于测定多巴胺的玻碳纳米结构金表面的电化学形成

纳米结构的金表面通过在玻碳电极上的恒电位、恒电位或恒电流电沉积制备。纳米结构金电极 (nsAu/GC) 用于测定水性介质中的多巴胺 (DA)。在所有情况下,发现 DA 的峰值电流(通过方波伏安法,SWV 获得)与其浓度之间成正比关系。然而,使用动电位电沉积表面获得了 DA 测定的最佳性能。SWV 峰值电流与高达 10 μM 的 DA 浓度呈线性关系,检测限 (3σ) 为 0.57 μM,相关系数 (r) 为 0.9966。还对常见干扰物质如抗坏血酸 (AA) 和尿酸 (UA) 对 DA 测定的影响进行了研究。使用纳米结构表面会产生 AA 和 UA 的峰值,这些峰值出现在 DA 峰值电位之上 0.15–0.20 V 处。在 0.1 mM AA 和 0.1 mM UA 存在下,获得的多巴胺检测限低于 1 μM。因此,在存在主要干扰物质的情况下,用金对玻璃碳表面进行纳米结构化可以方便且容易地改进 DA 的检测。
更新日期:2018-03-15
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