Abstract This work reports on the preparation of electrochemically reduced graphene oxide (ERGO)-poly(eriochrome black T) (pEBT) assembled gold nanoparticles for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in PBS pH 6.0. Characterisations of the composite were carried out by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. As a result of the synergistic effect, the modified glassy carbon electrode (GCE) possessed an efficient electrochemical catalytic activity with a high selectivity and sensitivity in oxidising AA-DA and DA-UA as compared to the bare GCE. The peak separations of AA and DA, DA and UA were 183 mV and 150 mV, respectively. The linear response ranges for AA, DA and UA were 10–900 μM, 0.5–20 μM and 2–70 μM with detection limits of 0.53 μM, 0.009 μM and 0.046 μM (S/N = 3), respectively. The sensitivity of ERGO-pEBT/AuNPs was measured as 0.003 µA/μM, 0.164 µA/μM and 0.034 µA/μM for AA, DA, and UA, respectively. The modified electrochemical sensor was used in the determination of AA, DA, and UA in vitamin C tablets and urine sample with good recovery.

中文翻译：

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电化学还原氧化石墨烯-聚（铬黑T）/金纳米粒子修饰的玻碳电极，用于同时测定抗坏血酸、多巴胺和尿酸

摘要 本工作报告了电化学还原氧化石墨烯 (ERGO)-聚(铬黑 T) (pEBT) 组装的金纳米粒子的制备，用于同时测定抗坏血酸 (AA)、多巴胺 (DA) 和尿酸 (UA) PBS pH 6.0。通过扫描电子显微镜 (SEM)、傅里叶变换红外 (FTIR)、电化学阻抗谱 (EIS) 和循环伏安法对复合材料进行表征。由于协同效应，与裸GCE相比，改性玻璃碳电极（GCE）在氧化AA-DA和DA-UA方面具有高效的电化学催化活性，具有高选择性和灵敏度。AA 和 DA、DA 和 UA 的峰分离分别为 183 mV 和 150 mV。AA、DA 和 UA 的线性响应范围为 10–900 μM，0。5–20 μM 和 2–70 μM，检测限分别为 0.53 μM、0.009 μM 和 0.046 μM (S/N = 3)。ERGO-pEBT/AuNPs 对 AA、DA 和 UA 的灵敏度分别测量为 0.003 µA/µM、0.164 µA/µM 和 0.034 µA/µM。改进后的电化学传感器用于测定维生素C片和尿样中的AA、DA和UA，回收率良好。