In a previous paper, which investigated the protective effects of several antioxidant compounds, as catechin, against the oxidative stress associated with renal failure induced by EG plus NH4Cl model, it was found that catechin pretreatment improved oxidative status by enhancing antioxidant defenses—superoxide dismutase and PON1 activities—and reducing oxidative damage. Here, PON1 is linked to kidney failure.