... pro-oxidant activity of urate masks its antioxidant activity as mentioned above, whereas, in the presence of quercetin,the pro-oxidant activity of urate disappears and itsantioxidant activity ... relationshipbetween antioxidant and pro-oxidant action of antioxi-dants, such as quercetin or urate, is closely related to thespatial and temporal interactions of the various actors, as emphasized by ... 45,13–19.14.Moran,J.,Klucas,R.,Grayer,R.,Abian,R.J.&Becana,M.(1997) Complexes of iron with phenolic compounds from soybeannodules and other legume tissues: prooxidant and antioxidantproperties....