Photosensitized formation of peroxyl radicals in aqueous solutions of adenine at 77 K |
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| Authors: | T A Lozinova A V Lander |
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| Institution: | 1. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, 119334, Russia
2. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, 117997, Russia
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| Abstract: | Conditions for the formation of peroxyl radicals photosensitized by near-UV irradiation in frozen aqueous solutions of adenine containing 0.1 M NaCl (pH 4–7) are studied. Analysis of the EPR spectra shows that the systems under study contain two types of peroxyl radicals presumably classified earlier as O 2 ?· and HO 2· · . The effect of freezing methods on the production of the radicals is shown. The signal from O 2 ?· predominates in the spectra of samples with open surfaces and is likely due to the reduction of adsorbed O2 molecules with photoejected electrons. The signal from HO 2 · could be due to photoinduced interaction between the sensitizer and solvent. Possible mechanisms of these processes are considered. |
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