Photoinduced formation of peroxyl radicals in aqueous solutions of nucleobase derivatives at 77 K

被引：5

作者：

Lozinova, T. A. ^{[1
]}

Lander, A. V. ^{[2
]}

机构：

[1] Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia

[2] Russian Acad Sci, Int Inst Earthquake Predict Theory & Math Geophys, Moscow 117997, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2015年 / 89卷 / 05期

关键词：

EPR; nucleobases; photolysis; peroxyl radicals; DEPENDENT ESR-SPECTRA; COMPUTER-ASSISTED ANALYSIS; ELECTRON-TRANSFER; SINGLET OXYGEN; PHOTOSENSITIZED FORMATION; INORGANIC-PHOSPHATE; GAMMA-IRRADIATION; FROZEN SOLUTION; RATE CONSTANTS; GLASSY WATER;

D O I：

10.1134/S0036024415050258

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

It is shown that the formation of free radicals photoinduced by near-UV irradiation at 77 K in aqueous solutions of guanosine-5'-monophosphate (GMP), adenosine (Ado), adenine (A), and thymine (T) containing NaCl (0.1 M) is intensified in the presence of O-2. Signals of peroxyl radicals O (2) (-center dot) and HO (2) (center dot) are indicated in analyzing EPR spectra, and their overall yield is 20-40% of the total amount of the formed paramagnetic products. It is found that the concentration ratio of O (2) (-center dot) and HO (2) (center dot) radicals depends not only on pH of the solutions before freezing but also on the duration of irradiation and method of freezing the samples. Plausible mechanisms of the processes are discussed.

引用

页码：898 / 906

页数：9

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