Activity of the antioxidant enzymes superoxide dismutase (a) and glutathione peroxidase (b) in the brain. C (normocholesterolemic group), HC (hypercholesterolemic group), AQ 70 (HC + aqueous extract 70 mg/kg), AQ 140 (HC + aqueous extract 140 mg/kg), NEPF 7 (HC + non-esterified phenolic fraction 7 mg/kg), NEPF 14 (HC + non-esterified phenolic fraction 14 mg/kg). The results are expressed as the means ± S.E.M; n = 5–8. Different letters represent significant differences between groups (Tukey-Kramer test, p < 0.05). * p < 0.05 normocholesterolemic (C) vs hypercholesterolemic (HC) groups by Student’s t test.