Aquecimento de vinho tinto e suco de uva utilizados em preparações culinárias não afeta a capacidade antioxidante e o teor de fenóis totais

Abstract

Objective: This study evaluated the antioxidant capacity and concentration of phenolic compounds in red wine and grape juice used in culinary preparations subjected to boiling. Methods: The assessments were done after different boiling times (100°C) using two systems: i) aluminum pot and stove flame and ii) volumetric flask and heating mantle. Samples of red wine (n=4) and grape juice (n=4) were subjected to boiling for 10, 20 and 60 minutes. Before and after each boiling period, the total antioxidant capacity was evaluated by the ferric reducing antioxidant power assay and the total phenol content was determined by the Folin-Ciocalteu reagent. Differences were compared by repeated measures analysis of variance (RM-ANOVA) (p<0.05). Results: The different boiling times did not cause significant changes in the total antioxidant capacity or total phenol content of the beverages, regardless of boiling method. Conclusion: The results show that the antioxidant properties of red wine and grape juice did not change significantly after boiling for 60 minutes.