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The dependence of alpha-tocopheroxyl radical reduction by hydroxy-2,3-diarylxan...
Morlière, Patrice; Patterson, Larry K.; Santos, Clementina M.M.; Silva, Artur; Marzière, Jean-Claude; Filipe, Paulo; Gomes, Ana; Fernandes, EduardaThe flavonoid quercetin is known to reduce the α-tocopheroxyl radical (˙TocO) and reconstitute α-tocopherol (TocOH). Structurally related polyphenolic compounds, hydroxy-2,3-diarylxanthones (XH), exhibit antioxidant activity which exceeds that of quercetin in biological systems. In the present study repair of ˙TocO by a series of these XH has been evaluated using pulse radiolysis. It has been shown that, among ...
Structure–activity relationships in hydroxy-2,3-diarylxanthone antioxidants. Fa...
Santos, Clementina M.M.; Silva, Artur; Filipe, Paulo; Santus, René; Patterson, Larry K.; Maziére, Jean-Claude; Cavaleiro, José; Morlière, PatriceA structure–activity relationship has been established for eight hydroxy-2,3-diarylxanthones (XH) bearing hydroxy groups on the two aryl rings. One-electron oxidation by superoxide radical-anions ( O2 -) and Trp radicals as well as reaction with CCl3O2 and CHCl2O2 radicals demonstrates that two OH groups are required for efficient antioxidant reactivity in cetyltrimethylammonium bromide micelles. Hydroxy gro...
Structure–activity relationships in hydroxy-2,3-diarylxanthone antioxidants. Fa...
Santos, Clementina M.M.; Silva, Artur; Filipe, Paulo; Santus, René; Patterson, Larry K.; Maziére, Jean-Claude; Cavaleiro, José; Morliere, PatriceA structure–activity relationship has been established for eight hydroxy-2,3-diarylxanthones (XH) bearing hydroxy groups on the two aryl rings. One-electron oxidation by superoxide radical-anions (ΣO2 -) and ΣTrp radicals as well as reaction with ΣCCl3O2 and ΣCHCl2O2 radicals demonstrates that two OH groups are required for efficient antioxidant reactivity in cetyltrimethylammonium bromide micelles. Hydroxy gro...
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