Abstract
The effect of imidazole, histamine, histidine, and their nitro derivatives on the radiation-induced transformations of glycero-1-phosphate and ethanol in deaerated aqueous solutions at pH 7 has been studied It has been found that the test substances in equimolar concentrations to glycero-1-phosphate inhibit the radiation-induced dephosphorylation by scavenging the radical products of water radiolysis. At an additive-to-substrate ratio of 1 : 100, the nitro derivatives of histidine and metronidazole efficiently inhibit the radiation-induced dephosphorylation of glycero-1-phosphate due to the interaction with its carbon-centered radicals with constants of (3.1–5.1) × 109 L mol–1 s–1. Using the radiolysis of a 1 M aqueous solution of ethanol, it was demonstrated that 5-nitroimidazoles quantitatively oxidize α-hydroxyethyl radicals; this manifested itself in the absence of 2,3-butanediol among the radiolysis products and a ~20-fold increase in the yield of acetaldehyde, as compared to that in a control experiment. Thus, metronidazole and the nitro derivatives of histidine are capable of suppressing the radiation-induced dephosphorylation of glycero-1-phosphate and, probably, glycerophospholipids due to the oxidation of their α-hydroxylcontaining carbon-centered radicals.
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This work was supported in part by the Belarusian Republican Foundation for Basic Research and the Ministry of Education of the Republic of Belarus, joint grant no. Kh20МV-014.
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Translated by V. Makhlyarchuk
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Brinkevich, S.D., Maliborskii, A.Y., Melnichuk, M.E. et al. Effects of Imidazole and Its Derivatives on Radiation-Induced Dephosphorylation of Glycero-1-Phosphate in Deaerated Aqueous Solutions. High Energy Chem 55, 155–164 (2021). https://doi.org/10.1134/S0018143921020053
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DOI: https://doi.org/10.1134/S0018143921020053