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Chemical structures and antioxidant and superoxide scavenging properties of plant polyphenols (PPs) studied. Concentrations of 50% inhibition (IC50, μM) of the reactions: (a) human low-density lipoprotein (LDL) oxidation by (myeloperoxidase [MPO]+H2O2) and nitrite; (b) NADPH-induced lipid peroxidation (LPO) in rat liver microsomes; (c) superoxide production in photo-oxidation of riboflavin assessed by nitroblue tetrazolium reduction.
