In vitro antioxidant capacity of Corryocactus brevistylus (sanky) and its effect on the pancreas morphology of alloxan-induced diabetic rats.

OBJECTIVE.: To determine the in vitro antioxidant capacity of Corryocactus brevistylus and its effect on glycemia and the pancreas of alloxan-induced diabetic rats. MATERIALS AND METHODS.: The antioxidant capacity of the hydroethanolic extract of sanky (HEES) was evaluated by assessing its ability to reduce 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric ion (FRAP). We used thirty adult rats, which were induced to diabetes with two doses of alloxan (80mg/kg). Rats were distributed into 5 groups (n=6), all groups received treatment by orogastric route for eight days. Group I received water, group II received metformin 14mg/kg and groups III, IV and V received sanky juice at 1.0; 4.0 and 16 mL/kg, respectively. Glycemia was evaluated by the rapid method (glucometer) (first and eighth day). After treatment, the animals were sacrificed and the pancreas was removed for histopathological study. RESULTS.: The antioxidant capacity of HEES by DPPH showed an IC50 of 0.77 mg/mL; the FRAP method showed a TEAC-FRAP of 22.31µg/mg. Glycemia decreased on the eighth day of treatment, with respect to the first day; a decrease in glycemia was also found in groups III-V, when compared to group I. Histologically, groups I-II presented severe atrophy and moderate necrosis of the islets of Langerhans; groups IV-V presented hypertrophy and mild multifocal necrosis at the islet level. CONCLUSIONS.: The extract of sanky showed antioxidant capacity in vitro and the juice exerts a hypoglycemic and protective effect on the pancreas.