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 O2−· and HO2· 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 O2−· and HO2· 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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