Resumo

ALIPOUR, B.S; EBRAHIMZADEH, M.A; ESLAMI, B  e  RAHMANI, Z. Antioxidant activities of Hypericum Fursei L.. Lat. Am. appl. res. [online]. 2014, vol.44, n.1, pp. 19-23. ISSN 1851-8796.

In this study, antioxidant activities of H. fursei were investigated. Different model were used for assay. IC₅₀ for DPPH radical-scavenging activity was 7.5±1.2 μg ml^-1. The IC₅₀ value for BHA was 92.9±4.5 μg ml^-1. The extract showed very good reducing power that was comparable with vitamin C (p> 0.05) but showed weak nitric oxide scavenging activity and Fe²⁺ chelating ability. Extract showed good activity in scavenging of H₂O₂. Inhibition was 99.1% at 800 μg ml^-1. The IC₅₀ values for extract and BHA were 333.1±14.7 and 52.0±4.5 μg ml^-1, respectively. Total phenol compounds, by the Folin Ciocalteu method, was 274±9.6 mg gallic acid equivalent/g of extract and the total flavonoid content, by AlCl₃ method was 23.9 ± 1.4 mg quercetin equivalent/g of extract. Antioxidant activity may be attributed to the presence of phenols and flavonoids in the extract

Palavras-chave : Antioxidant Activity; Hypericum Fursei; Reducing Power; Iron Chelating Activity.