Abstract

The present work demonstrates the development of functionalized carbon nanofiber and carbon nanotube composite paste electrode towards the electrochemical analysis of riboflavin (RF) in 0.2 M phosphate buffer solution of pH 7.0 in the presence of ascorbic acid. RF shows the enhanced electrochemical reaction at the modified electrode surface with well-resolved and distinct redox peaks than bare carbon nanotube paste electrode. The material characteristics were analyzed using field emission scanning electron microscopy, X-ray powder diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry methods. The proposed electrode gives a fine linear relation between the concentration of RF and oxidation peak current in the linear range of 5.0–60.0 µM with the limit of detection of 15.35 nM and limit of quantification of 51.18 nM. Also, the sensing capability of the electrode for RF analysis was tested in B-complex capsule with fine recoveries.

Graphic abstract

中文翻译：

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在功能化碳纳米纤维修饰的碳纳米管传感器上对核黄素进行简单而灵敏的电化学分析

摘要

目前的工作展示了功能化碳纳米纤维和碳纳米管复合糊状电极的发展，用于在抗坏血酸存在下，在 pH 7.0 的 0.2 M 磷酸盐缓冲溶液中对核黄素 (RF) 进行电化学分析。RF 显示改性电极表面的电化学反应增强，与裸碳纳米管糊状电极相比，具有解析良好且明显的氧化还原峰。使用场发射扫描电子显微镜、X 射线粉末衍射、电化学阻抗谱和循环伏安法分析材料特性。所提出的电极在 5.0-60.0 µM 的线性范围内提供了 RF 浓度和氧化峰值电流之间的良好线性关系，检测限为 15.35 nM，定量限为 51.18 nM。还，

图形摘要