Abstract

Poly(glutamine) film-modified carbon nanotube paste electrode (PGAMCNTPE) was prepared through the electropolymerization technique. The prepared electrode was characterized by Field Emission Scanning Electron Microscope (FE-SEM) and electrochemical approaches. It was applied to electrochemical monitoring of curcumin in phosphate buffer of pH 7.5 using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The bare carbon nanotube paste electrode was unable to identify curcumin, but PGAMCNTPE detects curcumin oxidation at 0.168 V and reduction at 0.098 V with good current sensitivity. Under calibrated conditions, the PGAMCNTPE shows the linear voltammetric response from 0.4 to 6 and 6 to 10 µM for curcumin, with the lower detection limit of 2.79 × 10⁻⁸ M. The planned curcumin sensing strategy was applied to food supplement with excellent recovery from 90 to 97%. Also, a simultaneous determination was performed with vanillin with less interference effect.

Graphic abstract

中文翻译：

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聚谷氨酰胺膜包裹的碳纳米管糊状电极用于香兰素测定姜黄素的电分析方法

摘要

通过电聚合技术制备了聚谷氨酰胺膜修饰的碳纳米管糊状电极（PGAMCNTPE）。用场发射扫描电子显微镜（FE-SEM）和电化学方法对制备的电极进行表征。使用循环伏安法（CV）和微分脉冲伏安法（DPV）将其应用于pH 7.5的磷酸盐缓冲液中的姜黄素的电化学监测。裸露的碳纳米管糊状电极无法识别姜黄素，但PGAMCNTPE在0.168 V时检测到姜黄素氧化，并在0.098 V时还原，具有良好的电流敏感性。在校准条件下，PGAMCNTPE显示姜黄素的线性伏安响应为0.4至6和6至10 µM，检测下限为2.79×10 ^-8M.计划的姜黄素感测策略应用于食品补充剂，具有90％至97％的极佳回收率。另外，用香草醛进行的同时测定具有较小的干扰作用。

图形摘要