The antioxidant activity of the crude n-hexane, dichloromethane, and methanol extracts from 25 species belonging to the Asteraceae, Euphorbiaceae, Rubiaceae, and Solanaceae families collected at natural reserves from the Eje Cafetero Ecorregión Colombia, were evaluated by using the spectrophotometric 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging method.
The strongest antioxidant activities were showed by the methanol and dichloromethane extracts from the Euphorbiaceae, Alchornea coelophylla (IC50
41.14 mg/l) and Acalypha platyphilla (IC50
111.99 mg/l), respectively. These two species had stronger DPPH radical scavenging activities than hydroquinone (IC50
151.19 mg/l), the positive control. The potential use of Colombian flora for their antioxidant activities is discussed.