Abstract A simple and sensitive electrochemical sensor based on graphene quantum dots (GQDs) and gold nanoparticles (GNPs) nanocomposite modified glassy carbon electrode (GQDs/GNPs/GCE) was developed for the determination of luteolin. The GQDs/GNPs/GCE was prepared by electrodeposition method, and characterized by scanning electron microscopy and electrochemical impedance spectroscopy. The GQDs/GNPs nanocomposite showed excellent synergistic electrochemical activity for the oxidation of luteolin. Compared to bare GCE, the GQDs/GNPs/GCE resulted in a 16-fold increase in the oxidation current of luteolin in phosphate buffer at pH 5.0. Using the differential pulse voltammetry method, the dependence of the oxidation current vs. concentration was found to be linear from 1 × 10−8 to 1 × 10−5 M with a regression coefficient of 0.997, and the detection limit of luteolin was 1.0 nM (S/N = 3). The recovery was between 98.8% and 101.4% in peanut hull samples. This strategy might enable more opportunities for the electrochemical determination of luteolin in practical applications.

中文翻译：

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基于石墨烯量子点/金纳米颗粒纳米复合修饰电极的灵敏选择性电化学传感器测定花生壳中的木犀草素

摘要 开发了一种基于石墨烯量子点 (GQDs) 和金纳米粒子 (GNPs) 纳米复合修饰玻碳电极 (GQDs/GNPs/GCE) 的简单灵敏的电化学传感器，用于测定木犀草素。GQDs/GNPs/GCE 采用电沉积法制备，并通过扫描电子显微镜和电化学阻抗谱进行表征。GQDs/GNPs 纳米复合材料对木犀草素的氧化表现出优异的协同电化学活性。与裸 GCE 相比，GQDs/GNPs/GCE 在 pH 5.0 的磷酸盐缓冲液中导致木犀草素的氧化电流增加 16 倍。使用微分脉冲伏安法，发现氧化电流对浓度的依赖性从 1 × 10−8 到 1 × 10−5 M 呈线性，回归系数为 0.997，木犀草素的检测限为 1.0 nM (S/N = 3)。花生壳样品的回收率在 98.8% 到 101.4% 之间。这种策略可能为实际应用中木犀草素的电化学测定提供更多机会。