Journal
RUSSIAN CHEMICAL BULLETIN
Volume 59, Issue 1, Pages 66-74Publisher
SPRINGER
DOI: 10.1007/s11172-010-0046-y
Keywords
kynurenine; 4-(2-aminophenyl)-4-oxocrotonic acid; triplet excited state; quenching reactions; laser flash photolysis; nitroxyl radicals; hydroxylamines
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Funding
- Federal Agency on Science and Innovations [02.512.11.2278]
- Russian Foundation for Basic Research [08-03-00539, 08-03-00432, 07-03-00253]
- Division of Chemistry and Materials Science of the Russian Academy of Sciences [5.1.1]
- President of the Russian Federation
- State Support Program for Leading Scientific Schools [NSh-3604.2008.3]
- Russian Academy of Sciences [22]
- Government of Moscow
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The reactions of triplet kynurenine and 4-(2-aminophenyl)-4-oxocrotonic acid, formed upon the thermal decomposition of kynurenine, with nitroxyl radicals and cyclic N-hydroxylamines were studied. Nitroxyl radicals were found to quench efficiently the triplet state of kynurenine (rate constant 3-6 center dot.10(8) L mol(-1) s(-1)). The quenching proceeds via the spin-exchange mechanism and affords no new products. Neither nitroxyl radicals, nor hydroxyl-lamines react with 4-(2-aminophenyl)-4-oxocrotonic acid under conditions similar to physiological.
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