Comparative evaluation of antioxidant activity of ethanolic extracts from leaves of Olea europaea L. from Eastern Algeria

Introduction-Objective-In recent decades the study of medicinal proprieties of Olea europaea showed an increase interest of medicinal plants and their traditional use for the treatment of various diseases. The olive tree or Olea europaea L. is an inseparable entity of the Mediterranean people. This plant belongs to the large family of oleaceae. The purpose of this study was to assess the antioxidant activity of the ethanolic extracts from four wild varieties of O.europea in the eastern regions of Algeria: Batna and Mila (highlands), Biskra (Sahara) and Skikda (coastal city). Material and methods - The evaluation of the antioxidant activity in vitro of the ethanolic extracts of O.europaea plant was carried out by various methods, in particular, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging effect and ferric reducing antioxidant power (FRAP). Results -Quantitative analysis of ethanolic extracts from the leaves of the plant O.europaea revealed that Mila’s extract was richer (420.36 mg GAE / g DM), followed by that of Batna (396.84 mg GAE/g DM), then that of Biskra (380.69 mg GAE / g MS) and finally by Skikda extract (368.45 mg GAE / g MS). The results of DPPH free radical scavenging of the ethanolic extracts showed that those of Batna and Mila had the most important power. Conclusion - The obtained results favorably confirm the use of O.europaea leaves in traditional Algerian medicine for the treatment of various diseases.