Department of Chemistry, University of Harran, Sanliurfa, 63510, Turkey.
Department of Chemistry, University of Harran, Sanliurfa, 63510, Turkey.
Anal Chim Acta. 2019 Dec 9;1087:93-103. doi: 10.1016/j.aca.2019.08.055. Epub 2019 Aug 26.
This study reports the preparation of a novel voltammetric platform based on the modification of a glassy carbon electrode (GCE) with carbon nanotubes (MWCNTs) and dysprosium oxide (DyO) nanoparticles. The electrode material was characterized by means of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction method (XRD). The novel platform (DyONPs/MWCNTs/GCE) was applied for the voltammetric determination of sunset yellow (SY) in the presence of tartrazine (TAR). SY was first adsorbed at the surface of DyONPs/MWCNTs/GCE by keeping it into a solution of SY for 200 s. Afterwards, the proposed platform was washed with ultrapure water and transferred with the adsorbed species in a voltammetric cell containing only 0.1 M phosphate buffer solution (PBS). Then, the novel platform (DyONPs/MWCNTs/GCE) exhibited excellent electrocatalytic activity and presented improved voltammetric responses when compared to other electrodes. The novel platform produced an improved anodic peak at 0.705 V and a corresponding cathodic peak at 0.690 V for SY and an irreversible anodic peak at 0.957 V for TAR. When compared to the electrode modified with only MWCNTs, a remarkable increase in current response and a electrocatalytic activity of the proposed platform were observed for SY and TAR at a GCE modified with both MWCNTs and DyONPs. A linear relationship was obtained between the current response and the concentration of SY over range of 1.0 × 10 M - 1.4 × 10 M with an LOD of 3.5 × 10 M using square wave voltammetry (SWV). The proposed procedure provided an accurate and a precise quantification to the analysis of food and pharmaceutical samples.
本研究报告了一种新型基于玻碳电极（GCE）修饰的伏安传感平台的制备，修饰材料为碳纳米管（MWCNTs）和氧化镝（DyO）纳米粒子。采用扫描电子显微镜（SEM）、能量色散 X 射线光谱（EDX）和 X 射线衍射法（XRD）对电极材料进行了表征。新型平台（DyONPs/MWCNTs/GCE）用于在食用柠檬黄（SY）存在下检测食用黄色素（TAR）。首先，将 SY 溶液保持在 DyONPs/MWCNTs/GCE 表面 200s 以将其吸附在表面上。之后，用超纯水冲洗该平台，并将吸附的物质转移到仅含有 0.1M 磷酸盐缓冲溶液（PBS）的伏安池中。然后，与其他电极相比，新型平台（DyONPs/MWCNTs/GCE）显示出优异的电催化活性和改善的伏安响应。新型平台对 SY 产生了一个改进的阳极峰，位于 0.705V，对应的阴极峰位于 0.690V，对 TAR 产生了一个不可逆的阳极峰，位于 0.957V。与仅用 MWCNTs 修饰的电极相比，当 GCE 用 MWCNTs 和 DyONPs 同时修饰时，对 SY 和 TAR 的电流响应和电催化活性有明显的增加。在使用方波伏安法（SWV）时，通过电流响应与 SY 浓度在 1.0×10-1.4×10-M 范围内呈线性关系，检测限为 3.5×10-M。该方法为食品和药物样品的分析提供了准确和精确的定量分析。
