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- Title
Electrocatalytic oxidation and flow-injection determination of sulfur amino acids on a glassy carbon electrode modified by a nickel(II) polytetrasulfophthalocyanine film.
- Authors
Shaidarova, L.; Gedmina, A.; Chelnokova, I.; Artamonova, M.; Budnikov, H.
- Abstract
The electrochemical oxidation of sulfur amino acids, i.e., cysteine, cystine, and methionine, is studied on a glassy carbon electrode modified by a film of nickel(II) polytetrasulfophthalocyanine ( poly-NiTsPc). Poly-NiTsPc demonstrates a selective mediator activity in the oxidation of sulfur amino acids, depending on the pH of solution. The proper conditions for fabricating a polymer film on the surface of glassy carbon are found and the conditions of registering the maximal electrocatalytic effect on the modified electrode are determined. A procedure is proposed for the voltammetric determination and amperometric detection of cysteine, cystine, and methionine on an electrode coated by a poly-NiTsPc film under the conditions of flow-injection analysis ( FIA). The linear relation of the electrocatalytic response of a composite electrode to amino acid concentration is observed to the level n × 10 M in the static mode and n × 10 M under FIA conditions.
- Subjects
ELECTRODES; POLYMER films; NICKEL; PHTHALOCYANINES; CYSTEINE
- Publication
Journal of Analytical Chemistry, 2013, Vol 68, Issue 6, p536
- ISSN
1061-9348
- Publication type
Article
- DOI
10.1134/S1061934813040114