Amperometric NADH sensor based on a carbon ceramic electrode modified with the natural carotenoid crocin and multi-walled carbon nanotubes
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- 作者：Mahmoud Roushani ; Maryam Karami ; Behruz Zare Dizajdizi
- 关键词：Crocin ; Carbon ceramic electrode ; Electroanalysis ; Methyltrimethoxysilane ; Sol ; gel ; Nanohybrid ; Amperometry ; Cyclic voltammetry ; Charge transfer coefficient ; Electrode surface coverage ; Electrocatalytic oxidation
- 刊名：Microchimica Acta
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：184
- 期：2
- 页码：473-481
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Nanochemistry; Nanotechnology; Characterization and Evaluation of Materials; Analytical Chemistry; Microengineering;
- 出版者：Springer Vienna
- ISSN：1436-5073
- 卷排序：184
文摘
A carbon ceramic electrode (CCE) was fabricated from a composite consisting of sol-gel, ceramic graphite, multi-walled carbon nanotubes and the natural carotenoid crocin. The resulting sensor is shown to allow for the determination of NADH at a rather low working potential of 0.22 V (vs. Ag/AgCl). The heterogeneous electron transfer rate constant (ks) and the surface coverage of the modified electrode are 16.8 s−1 and 22 pmol·cm−2, respectively. The sensor shows excellent and linear response in solutions of pH 7.0 over the 0.5 to 100 μM NADH concentration range, a 0.1 μM detection limit, and a sensitivity of 251.3 nA·μM−1·cm−2.