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Voltammetry of hypoxic cells radiosensitizer etanidazole radical anion in water
- 1.0335375 - ÚFCH JH 2011 RIV CH eng J - Journal Article
Gál, Miroslav - Hromadová, Magdaléna - Pospíšil, Lubomír - Híveš, J. - Sokolová, Romana - Kolivoška, Viliam - Kocábová, Jana
Voltammetry of hypoxic cells radiosensitizer etanidazole radical anion in water.
Bioelectrochemistry. Roč. 78, č. 2 (2010), s. 118-123. ISSN 1567-5394. E-ISSN 1878-562X
R&D Projects: GA ČR GP203/09/P502
Institutional research plan: CEZ:AV0Z40400503
Keywords : etanidazole * radiosensitizer * electron transfer * voltammetry
Subject RIV: CG - Electrochemistry
Impact factor: 3.520, year: 2010
Cytotoxic properties of radiosensitizers are due to the fact that, in the metabolic pathway, these compounds undergo one-electron reduction to generate radical anions. In this study we focused our interest on the electrochemical transfer of the first electron on radiosensitizer Etanidazole (ETN) and, consequently, on the ETN radical-anion formation in the buffered aqueous media. ETN was electrochemically treated in the broad pH range at various scan rates. Three reduction peaks and one oxidation peak were found. At strong alkaline pH the four-electron reduction peak was separated into one-electron and three-electron reductions. Under these conditions the standard rate constant k0 for the redox couple ETN − NO2 + e− right arrow over left arrow ETN − NO2•− was calculated. Moreover, the value of a so called E71 potential that accounts for the energy necessary to transfer the first electron to an electroactive group at pH = 7 in aqueous medium to form a radical anion was also determined.
Permanent Link: http://hdl.handle.net/11104/0179856
Number of the records: 1