Phenolic compounds and antioxidant activity of blueberry cultivars grown in Brazil

O objetivo deste trabalho foi avaliar a concentracao de compostos fenolicos totais, antocianinas monomericas totais e a atividade antioxidante in vitro das principais cultivares de mirtilo (Vaccinium sp.) produzidas no Brasil. O metodo Folin-Ciocalteau foi aplicado para quantificar os compostos fenolicos totais e os metodos ABTS, DPPH, FRAPe β-caroteno/acido linoleico para avaliar a atividade antioxidante. O teor de compostos fenolicos totais encontrado variou de 274,48 a 694,60 mg de equivalente a acido galico (EAG).100 g-1 em peso fresco (PF). A concentracao de antocianinas monomericas variou da cultivar Bluecrop ate a Tifblue, com valores de, respectivamente, 40,62 a 378,31 mg.100 g-1 PF. A atividade antioxidante medida pelos metodos ABTS, DPPH e FRAP mostrou grande amplitude entre as cultivares estudadas, com valores variando de, respectivamente, 1238,48 a 2445,96, 1014,24 a 2055,06 e 699,78 a 1740,25 µmol TEAC.100 g-1 PF. Os resultados confirmam o mirtilo como fonte de compostos fenolicos com elevada atividade antioxidante. Demonstram ainda que existem diferentes niveis de concentracoes de compostos fenolicos e atividade antioxidante de acordo com a cultivar e o local de producao desta fruta.

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