Microchimica Acta ( IF 5.3 ) Pub Date : 2021-09-06 , DOI: 10.1007/s00604-021-04992-x Radosław Porada 1 , Katarzyna Fendrych 1 , Bogusław Baś 1
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The utilization of environmentally friendly nanoporous natural zeolite exchanged with Ni2+ ions (NiZ) and conductive carbon black (CB) in the fabrication of a novel and selective voltammetric sensor of vitamin B6 (VB6) 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 VB6 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 VB6 concentration in the range 0.050 to 1.0 mg L−1 (0.30–5.9 μmol L−1) (R = 0.9993). The calculated limit of detection (LOD, S/N = 3), equal to 15 μg L−1 (0.09 μmol L−1), was much better compared to chemically modified electrodes with other carbon-based materials. The RSD for 0.5 mg L−1 was in the range 2.5–5.4% (n = 4). The developed NiZCB-GCE was successfully applied to the determination of VB6 in commercially available multivitamin dietary supplements, food, and water samples. The obtained recoveries ranged from 95 to 106%.
Graphical abstract
中文翻译：
基于镍交换天然沸石/炭黑杂化纳米复合材料的电化学传感器测定维生素B6
介绍了利用与 Ni 2+离子 (NiZ) 和导电炭黑 (CB)交换的环保纳米多孔天然沸石制备新型选择性维生素 B 6 (VB 6 )伏安传感器。使用的富含斜发沸石的沸石材料和 CB 在形态和结构特性方面进行了表征。Ni-沸石/炭黑改性玻碳电极（NiZCB-GCE）的优异性能源于结合沸石和导电炭黑的独特特性的协同效应，通过循环伏安法（CV）和电化学阻抗谱证实。 EIS) 测量。VB 6的测定利用差分脉冲伏安法（DPV）对支持电解质的pH值和仪器参数进行了优化，并进行了干扰研究。在优化条件下，电位 +0.72 V 处的氧化峰值电流 vs. Ag | 氯化银 | 3 M KCl 参比电极 在 0.050 至 1.0 mg L -1 (0.30–5.9 μmol L -1 ) ( R = 0.9993)范围内与 VB 6浓度呈线性关系。计算出的检测限 (LOD, S / N = 3) 等于 15 μg L -1 (0.09 μmol L -1 )，与具有其他碳基材料的化学修饰电极相比要好得多。0.5 mg L −1的 RSD范围为 2.5–5.4% ( n = 4)。开发的 NiZCB-GCE 已成功应用于测定市售多种维生素膳食补充剂、食品和水样中的 VB 6。获得的回收率在 95% 到 106% 之间。
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