Phytochemical Screening and Antioxidant Activity of Leaf Extracts from Ten Algerian Olea Europaea L. Varieties

Abstract

The aim of the current study is to investigate the content of some antioxidants extracted from ten olive leaf cultivars (Olea europaea L.) collected from east of Algeria followed by the assessment of antioxidant activities of these extracts using TAC, DPPH and reducing power assays. The findings show that ethanolic extracts of all cultivars are rich in total phenolic and flavonoid compounds with maximums of (322.90 ± 11.04 and 122.00 ± 8.40 mg GAE/g DE), respectively. The Aaleh cultivar's ethanolic extract exhibits the highest levels of total antioxidant capacity (349.80 ± 14.00 mg AAE/g DW), the highest potent antioxidant power (A0.5 value of 49.96 ±0.27 µg/ml), and the most significant DPPH radical scavenging activity (IC50: 55.46 ± 2.56 µg/ml).  In addition, the genotype of olive tree has a very high significant influence on the antioxidant amounts and activities. The results of this study provide a scientific basis for the traditional use of this local plants and demonstrate their potential as source of natural antioxidant bioactive compounds.