Reactions of .N02 with chromium(III) complexes with histamine and pyridoxamine ligands studied by the stopped-flow technique
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| Title: | Reactions of .N02 with chromium(III) complexes with histamine and pyridoxamine ligands studied by the stopped-flow technique |
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| Source: | Analytical Biochemistry. 350(2):256-262 |
| Publisher Information: | 2006. |
| Publication Year: | 2006 |
| Subject Terms: | SIN-1, NO2 radical, Kinetic mechanisms, Cr(III) complexes with histamine and pyridoxamine |
| Description: | This study demonstrated the direct formation of the nitrogen dioxide (radical dotNO2) radical during the decomposition of 3-morpholinosydnonimine (SIN-1) in biological buffer 4-morpholinoethanosulfone acid solution. Consequently, at approximately pH 4, SIN-1 can be used successfully as a source of radical dotNO2. This conclusion is drawn from a comparison of the reactions of cis-[Cr(C2O4)(L– L)(OH2)2]+, where L–L denotes pyridoxamine (Hpm) or histamine (hm), with the gaseous radical dotNO2 radical obtained by two methods: from SIN-1 and from a simple redox reaction. These reactions were investigated using the stopped-flow technique. The measurements were carried out at temperatures ranging from 5 to 25 °C over a pH range from 6.52 to 9.11 for cis-[Cr(C2O4)(Hpm) (OH2)2]+ and from 6.03 to 8.15 for cis-[Cr(C2O4)(hm)(OH2)2] +. We also determined the thermodynamic activation parameter (Ea) and the uptake mechanism for each of the coordination compounds studied. |
| Document Type: | Article |
| Language: | English |
| ISSN: | 0003-2697 |
| DOI: | 10.1016/j.ab.2005.12.01610.1016/j.ab.2005.12.016 |
| Accession Number: | edsair.dris...02463..260f81a3c7c183c5aaddd85f8e0100d8 |
| Database: | OpenAIRE |
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