Preparation and Electrochemical Behaviour of Silver Pentacyanonitrosylferrate Film Modified Glassy Carbon Electrode and Its Electrocatalytic Oxidation to  L ‐cysteine | Zendy

Liu Suqin | Zendy; Dai Gaopeng | Zendy

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Preparation and Electrochemical Behaviour of Silver Pentacyanonitrosylferrate Film Modified Glassy Carbon Electrode and Its Electrocatalytic Oxidation to L ‐cysteine

Author(s) -

Liu Suqin,

Dai Gaopeng

Publication year - 2011

Publication title -

journal of the chinese chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.329

H-Index - 45

eISSN - 2192-6549

pISSN - 0009-4536

DOI - 10.1002/jccs.201190096

Subject(s) - chemistry , electrochemistry , redox , electrode , cyclic voltammetry , glassy carbon , detection limit , cysteine , inorganic chemistry , working electrode , chemically modified electrode , electrolyte , voltammetry , reference electrode , analytical chemistry (journal) , organic chemistry , chromatography , enzyme

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 [Ag I Fe III/II (CN) 5 NO] 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 I pa (μA) = ‐68.58 ‐ 5.78C L ‐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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