| ESR STUDIES OF SPIN-TRAPPED RADICALS IN GAMMA-IRRADIATED POLYCRYSTALLINE PYRIMIDINE NUCLEOSIDES——CYTIDINE, DEOXYCYTIDINE, URIDINE AND DEOXYURIDINE |
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| 引用本文： | 张志义,臧伦义,盛沛根,王华黎.ESR STUDIES OF SPIN-TRAPPED RADICALS IN GAMMA-IRRADIATED POLYCRYSTALLINE PYRIMIDINE NUCLEOSIDES——CYTIDINE, DEOXYCYTIDINE, URIDINE AND DEOXYURIDINE[J].中国科学B辑(英文版),1986(11). |
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| 作者姓名： | 张志义 臧伦义 盛沛根 王华黎 |
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| 作者单位： | Institute of Biophysics，Academia Sinica，Beijing，Institute of Biophysics，Academia Sinica，Beijing，Shanghai Institute of Biochemistry，Academia Sinica，Shanghai Institute of Biochemistry，Academia Sinica |
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| 摘 要： | Room-temperature free radicals produced in four gamma-irradiated polycrystalline pyrimidine nucleosides (cytidine, deoxycytidine, uridine and deoxyuridine) were studied by an improved spin trapping and ESR methods with NtB (nitroso-t-butane) serving as the spin trap. The presence of three types of radicals was ascertained in all samples, i.e. —C(5)H—C(6) H_2—and —C(5)H_2—C(6)H— base radicals, and —C(5')H_2— ribose radical evolving from HOC(5')H—C(4')H<. In addition, radicals in which the unpaired electron was located on ribose C(1') and C(4') sites were tentatively distinguished. Stress was laid on the discussion of the mechanism of formation of ribose radicals.
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