We studied the interaction with liposomes and the antioxidant activity of flavonoid (quercetin, catechin, taxifolin) complexes with iron(III). It was found that the lipophilicity of complexes depends on an iron:flavonoid ratio and grows at a ratio of 1 to 1, while complexes in a 2: 1 ratio were the most effective to slow down the lipid peroxidation and restore radical 2,2-diphenyl-1-picrylhydrazyl. Thus, the stoichiometry of complexes formed in aqueous solution, may differ from the stoichiometry of complexes that most effectively protect membranes from peroxidation.

We studied the interaction with liposomes and the antioxidant activity of flavonoid (quercetin, catechin, taxifolin) complexes with iron (III). It was found that the lipophilicity of complexes depends on an iron:flavonoid ratio and grows at a ratio of 1 to 1, while complexes in a 2:1 ratio were the most effective to slow down the lipid peroxidation and restore radical 2,2-diphenyl-1-pic: rylhydrazyl. Thus, the stoichiometry of complexes formed in aqueous solution, may differ from the stoichiometry of complexes that most effectively protect membranes from.peroxidation.

Inhibition du transfert d'electrons par la quercetine et sa forme oxydee sur les sites respectivement accepteur et donneur du photosysteme 2. Roles respectifs de ces deux formes comme donneur et accepteur d'electrons dans le photosysteme 1