Electropolymerization of poly(methylene blue) on flower-like nickel-based MOFs used for ratiometric electrochemical sensing of total polyphenolic content in chrysanthemum tea
Electropolymerization of poly(methylene blue) on flower-like nickel-based MOFs used for ratiometric electrochemical sensing of total polyphenolic content in chrysanthemum tea
复制标题
聚亚甲基蓝在花状镍基 MOF 上的电聚合用于菊花茶中总多酚含量的比率电化学传感
DOI：
10.1039/d1ay00028d
复制
发表时间：
2021
影响因子：
3.1
通讯作者：
Jianhua Xie
中科院分区：
文献类型：
--
作者：
Chang Yin;Qianfen Zhuang;Qin Xiao;Yong Wang;Jianhua Xie
使用聚亚甲基蓝修饰的玻碳电极和花状镍基金属有机框架（PMB@Ni-TPA/GCE）构建了用于咖啡酸（CAE）检测的比率电化学传感器。在 PMB@Ni-TPA/GCE 上研究了 CAE 的电化学行为，发现遵循两电子、两质子电氧化过程。 PMB用作内参探针，Ni-TPA可以增强CAE和PMB的电化学信号。随着CAE浓度的增加，CAE的氧化峰电流增强，而PMB的氧化峰电流几乎保持不变。微分脉冲伏安法记录的CAE与PMB的氧化峰电流比在0.25~15.0 μM范围内随CAE浓度呈线性变化，检测限为0.2 μM。所提出的传感器成功地用于评估菊花茶中 CAE 等效的总多酚含量，结果与参考 Folin-Ciocalteu 分光光度法给出的结果相当。
A ratiometric electrochemical sensor for caffeic acid (CAE) detection was constructed using a glassy carbon electrode modified with poly(methylene blue) and flower-like nickel-based metal organic frameworks (PMB@Ni–TPA/GCE). The electrochemical behavior of CAE was investigated at the PMB@Ni–TPA/GCE, and was found to follow a two-electron, two-proton electrooxidation process. PMB was used as the internal reference probe, and Ni–TPA can enhance the electrochemical signals of both CAE and PMB. As the CAE concentration increases, the oxidation peak current of CAE is enhanced but that of PMB keeps almost unchanged. The oxidation peak current ratio between CAE and PMB recorded by differential pulse voltammetry changes linearly with CAE concentration over the range of 0.25–15.0 μM, with a detection limit of 0.2 μM. The proposed sensor was successfully employed to evaluate the total polyphenolic content as CAE equivalent in chrysanthemum tea, and the results were comparable with those given by the reference Folin–Ciocalteu spectrophotometry.