Determination of the activity of superoxide dismutase using a glassy carbon electrode modified with ferrocene imidazolium salts and hydroxy-functionalized graphene

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• 作者：Jian Wang ; Zhou Jiang ; Lili Xie ; Minyan Liu ; Yaofeng Yuan
• 关键词：Hydroxy ; functionalized graphene ; Ferrocene imidazolium salt ; Electrochemiluminescence ; Superoxide dismutase ; Modified electrode
• 刊名：Microchimica Acta
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：184
• 期：1
• 页码：289-296
• 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 glassy carbon electrode was modified with a composite consisting of ferrocene imidazolium salts and hydroxy-functionalized graphene in a Nafion matrix. The electrode is shown to facilitate the reduction of oxygen to form the superoxide anion radical. Atomic force microscopy and electrochemical impedance spectroscopy were used to characterize the electrode. The in-situ production of superoxide anion was then studied with an analogue of methyl-Cypridina luciferin (also referred to as Vargulin). As a result, an electrochemiluminescence (ECL) based assay was developed for the improved determination of the activity of the enzyme superoxide dismutase (SOD). Under optimized conditions, the ECL based calibration plot is linear in the 0.5 to 6.5 U·mL−1 SOD activity range, with a 0.2 U·mL−1 detection limit (at a signal-to-noise ratio of 3).