Free radical scavenging behavior of ten exotic tropical fruits extracts

The antiradical capacity (radical scavenger capacity, RSC) of bacuri, caja, camu-camu, carnauba, gurguri, jabuticaba, jambolao, jucara, murta, black puca and puca were studied using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH center dot) assay. To determine their RSC, the second-order rate constants (k(2)) for the oxidation of these extracts by DPPH center dot were calculated. The values of k(2) were compared to natural and synthetic antioxidants. The k(2) values (L/mol g s), in methanol at 25 degrees C. were 69.52, 26.03, 22.20, 18.04, 17.23, 16.56, 15.60, 10.03, 7.72 and 4.15 for camu-camu, murta, gurguri, carnauba, jabuticaba, black puca, jambolao, caja jucara and bacuri. (C) 2010 Elsevier Ltd. All rights reserved.