Green extracts from Coratina olive cultivar leaves: Antioxidant characterization and biological activity

• Published in: Journal of functional foods Vol. 31; pp. 63 - 70
• Main Authors: Difonzo, Graziana, Russo, Annamaria, Trani, Antonio, Paradiso, Vito M., Ranieri, Marianna, Pasqualone, Antonella, Summo, Carmine, Tamma, Grazia, Silletti, Roccangelo, Caponio, Francesco
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-04-2017; Elsevier
• Subjects: Antioxidant activity; Biophenols; Green extraction; Olive leaves; Reactive oxygen species; CTR; Reactive oxygen species; DPPH; Antioxidant activity; F; TPC; BHT; TBHP; TE; UHPLC-ESI-MS/MS; TEAC; Biophenols; Trolox; Green extraction; ROS; Eth; BHA; HD; ABTS; FD; Olive leaves
• ISSN: 1756-4646; 2214-9414
• DOI: 10.1016/j.jff.2017.01.039

•The olive leaves represent a source of bioactive compounds.•A green extraction method of biophenols from leave olives was set-up.•Leaves extracts exhibit a good antioxidant ability.
Olive leaves and their extracts are associated with food preservation and health, and are used in folk medicine to treat several diseases, mainly because of their polyphenols. In this investigation polyphenols were extracted from olive leaves using green solvents and evaluated the antioxidant activity of the extracts. Polyphenols were extracted from fresh, freeze-dried, and hot air-dried leaves using either ethanol/water mixtures (70:30, 30:70, v/v) or water alone. Antioxidant activity was assessed in bronchial epithelial NCI-H292 cells by measuring reactive oxygen species (ROS) and in vegetable oil by measuring oxygen consumption. Results showed that extracts with a good antioxidant activity could be obtained when leaves were pre-treated by hot air-drying. The use of water alone as the extraction solvent gave results comparable to those obtained with ethanol/water (30:70, v/v). These extracts were particularly rich in oleuropein, and had anti-ROS effects in NCI-H292 cells and antioxidant activity in vegetable oil.