2.6. Sample preparation to determine antioxidant activity
To obtain extracts for antioxidant activity two different methodologies
were used. The first procedure consisted of a dynamic
maceration in absolute ethanol for 24 h at room temperature with
a solvent: material ratio of 1:20. In the second procedure, original
samples (2.5 g) were extracted by shaking at room temperature for
60 min with 20 mL of methanol–water–HCl (50:50 v/v, pH 2) and
by shaking at room temperature for 60 min with 20 mL of acetone–
water (70:30 v/v). After centrifugation (15 min, 25 C,
3000g) supernatants were combined and used to determine
extractable antioxidant capacity.