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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Electrochemical sensor based on Nbim/CNT composite for selective determination of luteolin in the flavonoids
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Electrochemical sensor based on Nbim/CNT composite for selective determination of luteolin in the flavonoids

机译：基于Nbim / CNT复合材料的电化学传感器选择性测定黄酮类化合物中的木犀草素

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摘要

A new Nbim/CNT-modified glassy carbon electrode, combining the selective adsorptive capability of nitrosubstituted 3,3'-bis(indolyl)methane (Nbim) to flavonoids with the unique properties of CNTs with enlarged active surface area and extraordinary electrical conductivity, was fabricated for the analysis of luteolin with high sensitivity and selectivity. Compared to bare GCE, the Nbim/CNT-based modified electrode could synergistically enhance accumulation of luteolin from the flavonoid sample solution to the electrode surface and result in an 18-fold increase of the oxidation current of luteolin in phosphate buffer solution at pH 6.0. Using differential pulse voltammetry method, the oxidation current increased linearly with luteolin concentration at the range of 5-320 nM, with a detection limit of 0.6 nM. The proposed electrode could also effectively avoid the interference of similar structural flavonoids (quercetin, myricetin, and apigenin), which made the proposed sensor suitable for the accurate determination of luteolin in the actual samples. (C) 2015 Elsevier B.V. All rights reserved.
机译：一种新型的Nbim / CNT修饰的玻碳电极，结合了硝基取代的3,3'-双（吲哚基）甲烷（Nbim）对类黄酮的选择性吸附能力，以及具有增加的活性表面积和非凡的导电性的CNT的独特性能。用于分析木犀草素，具有高灵敏度和选择性。与裸露的GCE相比，基于Nbim / CNT的修饰电极可以协同增强木犀草素从类黄酮样品溶液到电极表面的积累，并导致pH 6.0时木犀草素在磷酸盐缓冲溶液中的氧化电流增加18倍。使用差分脉冲伏安法，氧化电流随木犀草素浓度在5-320 nM范围内线性增加，检测极限为0.6 nM。所提出的电极还可以有效避免类似结构类黄酮（槲皮素，杨梅素和芹菜素）的干扰，这使得所提出的传感器适合于实际样品中木犀草素的准确测定。 （C）2015 Elsevier B.V.保留所有权利。

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