Department of Chemistry Education, Farhangian University, P.O. Box 14665-889, Tehran, Iran.
Anal Methods. 2023 Oct 26;15(41):5500-5509. doi: 10.1039/d3ay01373a.
Developing a sensitive portable sensor for the determination of food additives is very important. Herein, a simple and sensitive electrochemical sensor has been constructed based on a carbon paste electrode (CPE) modified with graphene oxide (GO) nanosheets for the simultaneous determination of sunset yellow (SY) and rhodamine B (RhB) in phosphate buffer solution (pH = 4). The cyclic and differential pulse voltammetry (CV and DPV) results revealed two well-resolved anodic peaks for SY and RhB with a remarkable increase in oxidation signals of these colorants. Based on this, an electrochemical method was developed for the first time for the simultaneous detection of SY and RhB. Applicability of the sensor was confirmed in various concentrations of two analytes in two linear ranges of 1-20 μM for SY and 1-30 μM for RhB with a limit of detection (LOD) of 10.0 nM and 20.0 nM, respectively. Furthermore, the proposed sensor was successfully employed for the simultaneous detection of SY and RhB in food samples with recoveries of 93.1-106.0% indicating promising potential in practical application.
开发用于测定食品添加剂的灵敏便携式传感器非常重要。在此，基于氧化石墨烯（GO）纳米片修饰的碳糊电极（CPE），构建了一种简单灵敏的电化学传感器，用于同时测定磷酸盐缓冲溶液（pH = 4）中的日落黄（SY）和罗丹明 B（RhB）。循环伏安法（CV）和差分脉冲伏安法（DPV）的结果显示，SY 和 RhB 均具有两个良好分离的阳极峰，这些显色剂的氧化信号显著增加。基于此，首次建立了一种电化学方法，用于同时检测 SY 和 RhB。该传感器在两种分析物的不同浓度下具有适用性，SY 的线性范围为 1-20 μM，RhB 的线性范围为 1-30 μM，检测限（LOD）分别为 10.0 nM 和 20.0 nM。此外，该传感器还成功用于食品样品中 SY 和 RhB 的同时检测，回收率为 93.1-106.0%，表明其在实际应用中具有很大的潜力。
