Analytical Chemistry Department, Kazan Federal University, Kremleyevskaya, 18, Kazan 420008, Russia.
Department of High Molecular and Organoelement Compounds, Kazan Federal University, Kremleyevskaya, 18, Kazan 420008, Russia.
Sensors (Basel). 2023 Jan 17;23(3):1094. doi: 10.3390/s23031094.
Tartrazine and brilliant blue FCF are synthetic dyes used in the food, cosmetic and pharmaceutical industries. The individual and/or simultaneous control of their concentrations is required due to dose-dependent negative health effects. Therefore, the paper presents experimental results related to the development of a sensing platform for the electrochemical detection of tartrazine and brilliant blue FCF based on a glassy carbon electrode (GCE) modified with MnO nanorods, using anodic differential pulse voltammetry. Homogeneous and stable suspensions of MnO nanorods have been obtained involving cetylpyridinium bromide solution as a cationic surfactant. The MnO nanorods-modified electrode showed a 7.9-fold increase in the electroactive surface area and a 72-fold decrease in the electron transfer resistance. The developed sensor allowed the simultaneous quantification of dyes for two linear domains: in the ranges of 0.10-2.5 and 2.5-15 μM for tartrazine and 0.25-2.5 and 2.5-15 μM for brilliant blue FCF with detection limits of 43 and 41 nM, respectively. High selectivity of the sensor response in the presence of typical interference agents (inorganic ions, saccharides, ascorbic and sorbic acids), other food dyes (riboflavin, indigo carmine, and sunset yellow), and vanillin has been achieved. The sensor has been tested by analyzing soft and isotonic sports drinks and the determined concentrations were close to those obtained involving the chromatography technique.
酒石黄和亮蓝 FCF 是食品、化妆品和制药工业中使用的合成染料。由于剂量相关的负面健康影响，需要单独或同时控制它们的浓度。因此，本文介绍了基于玻碳电极（GCE）修饰的 MnO 纳米棒，通过阳极差分脉冲伏安法，用于电化学检测酒石黄和亮蓝 FCF 的传感平台的开发的实验结果。涉及十六烷基溴化吡啶溶液作为阳离子表面活性剂，获得了均匀且稳定的 MnO 纳米棒悬浮液。MnO 纳米棒修饰电极的电活性表面积增加了 7.9 倍，电子转移电阻降低了 72 倍。开发的传感器允许同时定量两种线性范围内的染料：酒石黄的范围为 0.10-2.5 和 2.5-15 μM，亮蓝 FCF 的范围为 0.25-2.5 和 2.5-15 μM，检测限分别为 43 和 41 nM。在存在典型干扰剂（无机离子、糖、抗坏血酸和山梨酸）、其他食品染料（核黄素、靛蓝胭脂红和日落黄）和香草醛的情况下，传感器的响应具有高选择性。该传感器已通过分析软饮料和等渗运动饮料进行了测试，所确定的浓度与涉及色谱技术的浓度接近。
