Preparation and Electrochemical Behaviour of Silver Pentacyanonitrosylferrate Film Modified Glassy Carbon Electrode and Its Electrocatalytic Oxidation to L‐cysteine |
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| Authors: | Suqin Liu Gaopeng Dai |
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| Affiliation: | 1. School of Chemical Engineering and Food Science, Xiangfan University, Xiangfan 441053, P. R. China;2. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China |
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| Abstract: | A glassy carbon (GC) electrode modified with silver pentacyanonitrosylferrate (AgPCNF) film as a redox mediator was fabricated. Cyclic voltammetry was used to study the redox property of AgPCNF modified electrode. The modified electrode showed a well‐defined redox couple due to [AgIFeIII/II(CN)5NO]1‐/2‐system. The effects of scan rates, supporting electrolytes and solution pHs were studied on the electrochemical behavior of the modified electrode. The feasibility of using the AgPCNF modified electrode to measure L ‐cysteine was investigated. It showed an excellent electrocatalytic activity towards the oxidation of L ‐cysteine and the anodic currents were proportional to the L ‐cysteine concentration in the range of 0.1 μM to 20 μM, the linear regression equation is Ipa(μA) = ‐68.58 ‐ 5.78CL ‐cysteine (μM), with a correlation coefficient 0.998 for N = 23. The detection limit was down to 3.5 × 10‐8 M (three times the ratio of signal to noise). |
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| Keywords: | Silver pentacyanonitrosylferrate L‐cysteine Electrocatalysis Modified electrode |
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