We recently reported that, depending on its concentration, urate is either apro- or anantioxidant inCu 2+ -induced low-density lipoprotein (LDL)oxidation. We also previously demonstrated an antioxidant synergy between urate and some flavonoids in the Cu 2+ -induced oxidation of diluted a result, the effectof theflavonoidquercetinon the Cu 2+ -induced oxidation of isolated LDL has been studied either in the presence or absence of urate.