Quantitative Determination of the Main Phenolic Compounds, Antioxidant Activity, and Toxicity of Aqueous Extracts of Olive Leaves of Greek and Spanish Genotypes

Olive leaves are rich in phenolic compounds, which give them antioxidant properties that associated with a lower incidence of disease. Therefore, the aim this work was to determine content, activity, and toxicity aqueous extracts olive main Spanish Greek cultivated wild genotypes. For these purposes, ‘Picual’ ‘Arbequina’ from Spain ‘Koronoeiki’ ‘Kalamon’ Greece were collected, as both countries. The genotypes analyzed by HPLC-DAD, DPPH?, ABTS?+ Folin–Ciocalteu, Microtox® methods also used. had highest oleuropein values, followed countries ‘Arbequina’. latter reflected activity measured DPPH? ABTS?+, positioned ‘Arbequina’, ‘Picual’, having most activity. As expected, total phenol Folin–Ciocalteu. Regarding inhibition bioluminescence Aliivibrio fischeri leaf Microtox®, EC5015 ranged between 11.82 82.50 mg/mL, demonstrating similar behavior other herbal infusions.