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Determination of Cysteine at Bismuth Nanostructure – Carbon Ionic Liquid Electrode by Square Wave Voltammetry
Author(s) -
Safavi Afsaneh,
Abbaspour Abdolkarim,
Ajamian Maral
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500174
Subject(s) - bismuth , ionic liquid , electrode , carbon paste electrode , detection limit , square wave , nanostructure , cysteine , cyclic voltammetry , voltammetry , chemistry , ionic bonding , inorganic chemistry , carbon fibers , selectivity , calibration curve , materials science , electrochemistry , organic chemistry , chromatography , nanotechnology , ion , composite number , catalysis , physics , voltage , quantum mechanics , composite material , enzyme
Bismuth nanostructure‐carbon ionic liquid electrode has been employed for sensitive determination of cysteine (Cys). Bismuth nanostructure was incorporated into the carbon ionic liquid electrode (CILE) and applied for determination of cysteine. An interaction was taking place between bismuth nanostructure and the thiol group of cysteine. The bismuth cysteinate complex oxidation potential occurred at more negative potential compared to the cysteine oxidation peak obtained at bare carbon ionic liquid electrode (CILE). Square wave voltammetry (SWV) was used for the determination of the cysteine and satisfactory results were obtained. The calibration curve was linear in the concentration range of 1 to 500 µM and 0.5–2 mM of Cys. A low detection limit of 0.5 µM was achieved for Cys. The electrode showed a good selectivity for determination of cysteine in the presence of other amino acids. The proposed electrode was satisfactory applied for the determination of cysteine in human serum plasma sample.