Abstract
A comparative study is performed of the effect an inorganic phosphate (Pi) has on the formation of hydrogen peroxide in aqueous solutions of 2 × 10−4 M adenine derivatives (AX), such as adenine, adenosine, and adenosine-5'-diphosphate, irradiated at 77 K by near-UV in the wavelength range λ = 260–400 and 290–460 nm. It is found that the yield of H2O2 in irradiated samples grows upon adding 5 × 10−4 M Pi. The yield of H2O2 is normally increased in the presence of NaCl, while a tenfold increase in [Pi] results in only a moderate rise in [H2O2]. It is shown that the effect irradiation has on the yield of H2O2 depends on both AX and the [NaCl] and [Pi] ratio. The obtained data are compared to the results from measuring the EPR spectra of irradiated solutions before defrosting. Possible mechanisms of photoinitiated processes of H2O2 formation in the studied systems are discussed.
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ACKNOWLEDGMENTS
This work was performed on a Bruker EMX-8 EPR spectrometer at the New Materials and Technologies shared resource center of the Emanuel Institute of Biochemical Physics.
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Lozinova, T.A., Lobanov, A.V., Degtyarev, E.N. et al. Role of an Inorganic Phosphate in the Photogeneration of Hydrogen Peroxide in Aqueous Solutions of Adenine Derivatives at 77 K. Russ. J. Phys. Chem. 95, 1591–1600 (2021). https://doi.org/10.1134/S0036024421080185
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DOI: https://doi.org/10.1134/S0036024421080185