Abstract
The antiradical capacity (radical-scavenging capacity, RSC) of seven tropical fruit from the Brazilian north-east (açaí, acerola, cashew apple, mangaba, murici, umbu and uvaia) were studied using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) assay. To determine their RSC, the second-order rate constants (k2) for the oxidation of these extracts by DPPH were calculated. The values of k2 were compared to natural and synthetic antioxidants. The k2 values (l/mol g s), in methanol at 25 °C, were 38.0, 29.7, 21.3, 20.1, 10.1, 9.54 and 5.47 for acerola, cashew apple, mangaba, umbu, açaí, uvaia and murici, respectively.
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