ATIVIDADES ANTIOXIDANTE E ALELOPÁTICA DE EXTRATOS FOLIARES OBTIDOS DE EUGENIA DYSENTERICA

Abstract

The aim of this study was to evaluate the antioxidant and allelopathic potential of ethanolic and hydroalcoholic 70:30 and 50:50 (ethanol: water) extracts from the leaves of Eugenia dysenterica. The antioxidant activity of the extracts were evaluated by applying the free radical scavenging method using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). The allelopathic bioassays were carried out in laboratory, considering germination percentage, Index of Germination Speed (IVG), radicle / primary root length and hypocotyl / coleoptile length of lettuce and corn seeds. All parameters underwent variance analysis, and the mean values were compared by means of Scott-Knott test (p less then 5%). In relation to the antioxidant potential all extracts showed activity, with inhibitory concentration (IC50) at 0.73; 1.68 e 1.83mg/mL for the ethanolic, hydroalcoholic 70:30 e hydroalcoholic 50:50, respectively. Regarding allelopathic activity, all extracts reduced the IVG of lettuce and inhibit the radicle / primary root growth and hypocotyl / coleoptile of target species. Therefore, the extracts tested of E. dysenterica showed antioxidant potential and allelopathic inhibitory effect on the initial development of lettuce and corn