Antioxidative properties of nitroxyl radicals and hydroxyamines in reactions with triplet and deaminated kynurenine
作者:V. V. Yan’shole、I. A. Kirilyuk、I. A. Grigor’ev、S. V. Morozov、Yu. P. Tsentalovich
DOI:10.1007/s11172-010-0046-y
日期:2010.1
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·.108 L mol-1 s-1). The quenching proceeds via the spin-exchange mechanism and affords no new products.
研究了犬尿氨酸热分解后形成的三线态犬尿氨酸和 4-(2-氨基苯基)-4-氧代巴豆酸与硝酰基自由基和环状 N-羟胺的反应。发现硝酰基自由基有效地淬灭犬尿氨酸的三重态(速率常数 3–6·.108 L mol-1 s-1)。淬灭通过自旋交换机制进行并且没有提供新产品。在类似于生理学的条件下,硝酰基自由基和羟基胺都不会与 4-(2-氨基苯基)-4-氧代巴豆酸反应。