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• W3128840229 abstract "Aerobic mixture of selenite (SeO 3 2− ) with glutathione (GSH) generates hydroxyl radical (HO ) via the formation of glutathione persulfide (GSSe − ) and its further reaction with hydrogen peroxide. Mixtures of selenate, selenocystine or selenomethionine with GSH produce HO at significantly lower extent. • Aerobic mixture of glutathione and SeO 3 2− hydroxylates terephthalic acid (TA). • Hydroxylation of TA is weakly pronounced in the case of other selenium species. • Reaction of glutathione perselenide with H 2 O 2 produces HO . The present study examined generation of hydroxyl radical (HO ) in aqueous aerobic solutions (pH 7.1) containing selenite (SeO 3 2− ) and glutathione (GSH) using terephthalic acid (TA) scavenging HO to give highly fluorescent 2-hydroxyterephthalic acid (TA-OH). The highest reaction rate and yield of TA-OH were observed in a micromolar concentration range of selenite at [GSH] = 0.5 mM. Accumulation of TA-OH was substantially lower in the case of other selenium species (viz. selenomethionine, selenocystine and selenate) and their mixtures with GSH. Addition of superoxide dismutase notably increased the rate of TA-OH formation, whereas catalase inhibited the reaction. Mixture of other thiols (i.e., cysteine or cysteamine) with SeO 3 2− hydroxylates TA as well, although the rate of the reaction is lower than in the case of GSH. The mechanism consists of the rapid reduction of SeO 3 2− by GSH to Se(0), reversible formation of glutathione perselenide (GS-Se − ) and its further reaction with hydrogen peroxide to give HO ." @default.
• W3128840229 created "2021-02-15" @default.
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• W3128840229 date "2021-04-01" @default.
• W3128840229 modified "2023-10-16" @default.
• W3128840229 title "Formation of hydroxyl radical in aqueous solutions containing selenite and glutathione" @default.
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• W3128840229 doi "https://doi.org/10.1016/j.poly.2021.115072" @default.
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