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- W1983525499 abstract "The flavonol myricetin, reacts with oxygen-centred galvinoxyl radicals 28 times faster than d-α-tocopherol (vitamin E), the main lipid-soluble antioxidant in biological membranes. Moreover, each myricetin molecule reduces twice as many such radicals as vitamin E. However, myricetin fails to protect vitamin E-deficient microsomes from lipid peroxidation as assessed by the formation of thiobarbituric acid reactive substances (TBARS). Novel and potentially therapeutic antioxidants have been prepared that combine the radical-scavenging ability of a myricetin-like head group with a lipophilic chain similar to that of vitamin E. C6–C12 alkyl chains are attached to the A-ring of either a 3,3′,4′,5′-tetrahydroxyflavone or a 3,2′,4′,5′-tetrahydroxyflavone head group to give lipophilic flavonoids (ClogP=4 to 10) that markedly inhibit iron-ADP catalysed oxidation of microsomal preparations. Orientation of the head group as well as total lipophilicity are important determinants of antioxidant efficacy. MM2 models indicate that our best straight chain 7-alkylflavonoids embed to the same depth in the membrane as vitamin E. The flavonoid head groups are prepared by aldol condensation followed by Algar–Flynn–Oyamada (AFO) oxidation or by Baker–Venkataraman rearrangement. The alkyl tails are introduced by Suzuki or Negishi palladium-catalysed cross-coupling or by cross-metathesis catalysed by first generation Grubbs catalyst, which tolerate phenolic hydroxyl and ketone groups." @default.
- W1983525499 created "2016-06-24" @default.
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- W1983525499 date "2004-05-01" @default.
- W1983525499 modified "2023-10-10" @default.
- W1983525499 title "Potential therapeutic antioxidants that combine the radical scavenging ability of myricetin and the lipophilic chain of vitamin E to effectively inhibit microsomal lipid peroxidation" @default.
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- W1983525499 doi "https://doi.org/10.1016/j.bmc.2004.02.031" @default.
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