Abstract

In this study, ZnFe₂O₄ magnetic nanoparticles were used to modify a screen printed electrode. The modified electrode decreased the over-potential of vitamin C (70 mV) and prominently increased its oxidation peak current (3.3%). Under optimum conditions, the electrode provided a linear response based on the vitamin C concentrations between 0.5–500.0 μM, with a detection limit of 0.15 µM, by using the differential pulse voltammetric method. The modified electrode exhibited excellent electrochemical performance, including a good linear range and a micromolar detection limit, high sensitivity, and desirable stability and repeatability. Particularly, the practical applicability was revealed by quantifying the vitamin C concentrations in real samples.

中文翻译：

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改性丝网印刷电极测定维生素 C：在实际样品中检测维生素 C 的应用

摘要

在这项研究中，ZnFe ₂ O ₄磁性纳米粒子被用来修饰丝网印刷电极。修饰电极降低了维生素 C 的过电位 (70 mV)，并显着增加了其氧化峰值电流 (3.3%)。在最佳条件下，电极基于 0.5–500.0 μM 的维生素 C 浓度提供线性响应，通过使用差分脉冲伏安法，检测限为 0.15 μM。修饰电极表现出优异的电化学性能，包括良好的线性范围和微摩尔检测限、高灵敏度以及理想的稳定性和重复性。特别是，通过量化实际样品中的维生素 C 浓度揭示了实际适用性。