Tajik Somayeh, Beitollahi Hadi
Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran.
Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
Food Chem Toxicol. 2022 Jul;165:113048. doi: 10.1016/j.fct.2022.113048. Epub 2022 May 4.
The sunset yellow, as a synthetic food coloring azo dye, was detected in the present work using a new sensitive and selective sensor based on the modification of screen-printed electrode surface with Copper ferrite nanoparticles (CuFeO/SPE). Thus, a facile hydrothermal protocol was performed to prepare the CuFeO nanoparticles, followed by characterization applying valid techniques, including Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FE-SEM). Chronoamperometry, differential pulse voltammetry (DPV) and cyclic voltammetry (CV) were employed to determine the electrochemical behavior of as-fabricated sensor. According to the electrochemical findings, a greater anodic peak current was found for the sunset yellow oxidation on the CuFeO/SPE than that on the unmodified SPE. The electrocatalytic response for the sunset yellow oxidation on the CuFeO/SPE in phosphate buffer (0.1 M, pH = 7.0) was effective, with an excellent sensitivity (0.1919 μA μM). There was a linear relationship between the voltammetric current and different sunset yellow concentrations (0.03-100.0 μM). The calculated limit of detection (LOD = 3Sb/m) for the sunset yellow was 0.009 μM.
日落黄作为一种合成食用偶氮染料，在本研究中通过一种新型灵敏且选择性的传感器进行检测，该传感器基于用铁酸铜纳米颗粒（CuFeO/SPE）修饰丝网印刷电极表面。因此，采用简便的水热法制备铁酸铜纳米颗粒，随后运用有效技术进行表征，包括傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、能量色散X射线光谱（EDS）和场发射扫描电子显微镜（FE-SEM）。采用计时电流法、差分脉冲伏安法（DPV）和循环伏安法（CV）来测定所制备传感器的电化学行为。根据电化学研究结果，发现铁酸铜修饰的丝网印刷电极（CuFeO/SPE）上日落黄氧化的阳极峰值电流比未修饰的丝网印刷电极上的更大。在磷酸盐缓冲液（0.1 M，pH = 7.0）中，铁酸铜修饰的丝网印刷电极（CuFeO/SPE）对日落黄氧化的电催化响应有效，灵敏度极佳（0.1919 μA μM）。伏安电流与不同浓度的日落黄（0.03 - 100.0 μM）之间存在线性关系。计算得出日落黄的检测限（LOD = 3Sb/m）为0.009 μM。
