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

  • Photochemistry and Magnetochemistry
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Abstract

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 O2. Signals of peroxyl radicals O −·2 and HO ·2 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 and HO ·2 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.

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Authors and Affiliations

  1. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, 119334, Russia

    T. A. Lozinova

  2. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, 117997, Russia

    A. V. Lander

Authors
  1. T. A. Lozinova
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  2. A. V. Lander
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Correspondence to T. A. Lozinova.

Additional information

Original Russian Text © T.A. Lozinova, A.V. Lander, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 5, pp. 869–878.

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Lozinova, T.A., Lander, A.V. Photoinduced formation of peroxyl radicals in aqueous solutions of nucleobase derivatives at 77 K. Russ. J. Phys. Chem. 89, 898–906 (2015). https://doi.org/10.1134/S0036024415050258

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