Radiation induced decomposition of tryptophan in the presence of oxygen

被引：0

作者：

Josimovic, L. ^{[1
]}

Jankovic, I. ^{[1
]}

Jovanovic, S.V. ^{[1
]}

机构：

[1] Laboratory of Solid Phase Physics, and Radiation Chemistry, Boris Kidric Inst. of Nuclear Scis., P.O. Box 522, 11001 Beograd, Yugoslavia

来源：

Radiation Physics and Chemistry | 1993年 / 41卷 / 06期

关键词：

Amino acids - Decomposition - Electron beams - Free radical reactions - Free radicals - Gamma rays - Oxygen - Peroxides - Pigments - Radiation effects - Reaction kinetics - Solutions;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Tryptophan decomposition in oxygenated aqueous solutions in neutral media was investigated by gamma and pulsed electron irradiation. By using pulse radiolysis it was found that 27% of tryptophan OH-adducts eliminate water. Tryptophan neutral radical, Trp, thus formed reacts rapidly with O2-&middot, k(Trp&middot+O2-&middot) = (4.5± 0.7)×109M-1s-1. The remaining tryptophan OH-adducts react with oxygen to give peroxy radicals which may eliminate O2-&middot, produce N-formylkynurenine and disproportionate yielding organic peroxides. Peroxy radicals derived from tryptophan H-adducts regenerate tryptophan by the elimination of HO2&middot, and recombine with TrpH(OH)OO&middot radicals producing organic peroxides.

引用

页码：835 / 841

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