排序方式: 共有37条查询结果,搜索用时 15 毫秒
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L. G. Shaidarova A. V. Gedmina I. A. Chelnokova G. K. Budnikov 《Journal of Analytical Chemistry》2003,58(9):886-891
The electrochemical properties of a glassy-carbon electrode modified with a polyvinylpyridine film with electrodeposited palladium were studied. Conditions were selected for preparing a composite film on a glassy-carbon surface. It was found that palladium particles deposited on the polyvinylpyridine film exhibited electrocatalytic activity in the oxidation of H2C2O4. Compared to an unmodified electrode, the oxidation potential of oxalic acid decreased and the current of its oxidation multiply increased. The catalytic current of oxalic acid oxidation was a linear function of its concentration in the range from 1 × 10–2 to 1 × 10–6 M. 相似文献
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L. G. Shaidarova A. V. Gedmina I. A. Chelnokova M. L. Artamonova H. C. Budnikov 《Journal of Analytical Chemistry》2013,68(6):536-544
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?6 M in the static mode and n × 10?9 M under FIA conditions. 相似文献
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L. G. Shaidarova A. V. Gedmina I. A. Chelnokova G. K. Budnikov 《Journal of Analytical Chemistry》2004,59(11):1025-1031
The electrochemical properties of a glassy-carbon electrode modified with a polyvinyl pyridine film with electrodeposited rhodium were studied. It was found that the electrodeposited rhodium particles exhibit electrocatalytic activity in the oxidation of hydroquinone and pyrocatechol. The catalytic effect manifested itself as a multiple increase in the saturation current of an organic compound. The modified electrode was used for determining adrenalin, noradrenaline, and dopamine bearing a pyrocatechol fragment in their structure in pharmaceuticals. 相似文献
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L. G. Shaidarova A. V. Gedmina I. A. Chelnokova G. K. Budnikov 《Journal of Analytical Chemistry》2008,63(9):891-896
Particles of osmium or an inorganic polymeric film of osmium oxide-ruthenium cyanide (OsO-RuCN) electrodeposited on glassy carbon (GC) electrocatalyze the oxidation of dopamine (DA), adrenaline (AD), and noradrenaline (NAD). It is found that these biogenic amines are determined with a high sensitivity by oxidation at an electrode with an OsO-RuCN film. Procedures for the voltammetric determination of DA, AD, or NAD at a composite film electrode are developed. The currents of the substrate oxidation are linear functions of the concentrations in the ranges from 5 × 10?7 to 1 × 10?3 M for DA and from 1 × 10?6 to 1 × 10?3 M for AD and NAD. 相似文献
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