School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China.
College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
Molecules. 2018 Aug 24;23(9):2130. doi: 10.3390/molecules23092130.
Control and detection of sunset yellow is an utmost demanding issue, due to the presence of potential risks for human health if excessively consumed or added. Herein, cuprous oxide-electrochemically reduced graphene nanocomposite modified glassy carbon electrode (Cu₂O-ErGO/GCE) was developed for the determination of sunset yellow. The Cu₂O-ErGO/GCE was fabricated by drop-casting Cu₂O-GO dispersion on the GCE surface following a potentiostatic reduction of graphene oxide (GO). Scanning electron microscope and X-ray powder diffractometer was used to characterize the morphology and microstructure of the modification materials, such as Cu₂O nanoparticles and Cu₂O-ErGO nanocomposites. The electrochemical behavior of sunset yellow on the bare GCE, ErGO/GCE, and Cu₂O-ErGO/GCE were investigated by cyclic voltammetry and second-derivative linear sweep voltammetry, respectively. The analytical parameters (including pH value, sweep rate, and accumulation parameters) were explored systematically. The results show that the anodic peak currents of Cu₂O-ErGO /GCE are 25-fold higher than that of the bare GCE, due to the synergistic enhancement effect between Cu₂O nanoparticles and ErGO sheets. Under the optimum detection conditions, the anodic peak currents are well linear to the concentrations of sunset yellow, ranging from 2.0 × 10 mol/L to 2.0 × 10 mol/L and from 2.0 × 10 mol/L to 1.0 × 10 mol/L with a low limit of detection (S/N = 3, 6.0 × 10 mol/L). Moreover, Cu₂O-ErGO/GCE was successfully used for the determination of sunset yellow in beverages and food with good recovery. This proposed Cu₂O-ErGO/GCE has an attractive prospect applications on the determination of sunset yellow in diverse real samples.
日落黄的控制和检测是一个非常重要的问题，因为如果过度食用或添加，它会对人体健康造成潜在风险。在此，我们开发了一种氧化铜-电化学还原氧化石墨烯纳米复合材料修饰玻碳电极（Cu₂O-ErGO/GCE），用于测定日落黄。Cu₂O-ErGO/GCE 的制备方法是先将 Cu₂O-GO 分散液滴涂在 GCE 表面，然后进行氧化石墨烯的恒电位还原。采用扫描电子显微镜和 X 射线粉末衍射仪对修饰材料的形貌和微观结构进行了表征，如 Cu₂O 纳米粒子和 Cu₂O-ErGO 纳米复合材料。通过循环伏安法和二阶线性扫描伏安法分别研究了日落黄在裸 GCE、ErGO/GCE 和 Cu₂O-ErGO/GCE 上的电化学行为。系统研究了分析参数（包括 pH 值、扫描速率和积累参数）。结果表明，由于 Cu₂O 纳米粒子和 ErGO 片之间的协同增强效应，Cu₂O-ErGO /GCE 的阳极峰电流比裸 GCE 高 25 倍。在最佳检测条件下，阳极峰电流与日落黄的浓度呈良好的线性关系，范围从 2.0×10 -6 到 2.0×10 -5 mol/L 和从 2.0×10 -6 到 1.0×10 -5 mol/L，检测限低（S/N = 3，6.0×10 -6 mol/L）。此外，Cu₂O-ErGO/GCE 成功地用于饮料和食品中日落黄的测定，具有良好的回收率。该方法具有在各种实际样品中测定日落黄的应用前景。
