Department of Analytical Chemistry and Biochemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059, Krakow, Poland.
Mikrochim Acta. 2021 Sep 6;188(10):323. doi: 10.1007/s00604-021-04992-x.
The utilization of environmentally friendly nanoporous natural zeolite exchanged with Ni ions (NiZ) and conductive carbon black (CB) in the fabrication of a novel and selective voltammetric sensor of vitamin B (VB) is presented. The used clinoptilolite-rich zeolite material and CB were characterized in terms of morphology and textural properties. The superior properties of Ni-zeolite/carbon black modified glassy carbon electrode (NiZCB-GCE), arising from the synergistic effect of combining the unique features of zeolite and conductive carbon black, were confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. In the determination of VB with the use of differential pulse voltammetry (DPV), the optimization of the pH value of supporting electrolyte and instrumental parameters, as well as the interference study were performed. Under optimized conditions, the oxidation peak current at the potential +0.72 V vs. Ag | AgCl | 3 M KCl reference electrode was linear to the VB concentration in the range 0.050 to 1.0 mg L (0.30-5.9 μmol L) (R = 0.9993). The calculated limit of detection (LOD, S/N = 3), equal to 15 μg L (0.09 μmol L), was much better compared to chemically modified electrodes with other carbon-based materials. The RSD for 0.5 mg L was in the range 2.5-5.4% (n = 4). The developed NiZCB-GCE was successfully applied to the determination of VB in commercially available multivitamin dietary supplements, food, and water samples. The obtained recoveries ranged from 95 to 106%.
本文提出了一种利用镍离子（NiZ）交换的环保纳米多孔天然沸石和导电炭黑（CB）制备新型、选择性维生素 B（VB）伏安传感器的方法。使用的斜发沸石富矿沸石材料和 CB 进行了形貌和结构性质的表征。通过循环伏安法（CV）和电化学阻抗谱（EIS）测量，证实了 Ni-沸石/炭黑修饰玻碳电极（NiZCB-GCE）的优越性能，这是由于沸石和导电炭黑的独特特性结合产生的协同效应。在使用差分脉冲伏安法（DPV）测定 VB 时，对支持电解质和仪器参数的 pH 值优化以及干扰研究进行了研究。在优化条件下，在+0.72 V 相对于 Ag | AgCl | 3 M KCl 参比电极的氧化峰电流与 VB 浓度在 0.050 至 1.0 mg L（0.30-5.9 μmol L）范围内呈线性关系（R = 0.9993）。计算得出的检测限（LOD，S/N = 3），相当于 15 μg L（0.09 μmol L），与使用其他基于碳的材料的化学修饰电极相比，要好得多。0.5 mg L 的 RSD 范围为 2.5-5.4%（n = 4）。所开发的 NiZCB-GCE 成功应用于市售多种维生素膳食补充剂、食品和水样中 VB 的测定。获得的回收率范围为 95-106%。
