title: Activity assessment of Tunisian olive leaf extracts against the trophozoite stage of Acanthamoeba.
abstract: The olive tree (Olea europaea, Oleaceae) has historically provided huge economic and nutritional benefits to the Mediterranean basin. In fact, olive leaf extracts have also been used by native people of this area in folk medicine to treat fever and other diseases such as malaria. Recently, several studies have focused on the extraction of high-added-value compounds from olive leaves. However, no previous studies have been developed in order to evaluate the activity of these extracts against Acanthamoeba. In the present work, olive leaf extracts from five different Tunisian varieties of olive trees (Chemlali Tataouine, Zarrazi, Toffehi, Dhokkar, and Limouni) were obtained by using three different solvents, and their activity against the trophozoite stage of Acanthamoeba castellanii Neff was screened. The IC50/96 h (50% parasite growth inhibition) was chosen as the appropriate and comparable data to give as previously described. It could be observed that the amoebicidal activity was dose dependent. Trophozoite growth was inhibited by all the tested extracts with IC50 ranging from 8.234 ± 1.703 μg/ml for the alcoholic mixture of the Dhokkar extract to 33.661 ± 1.398 μg/ml for the methanolic extract of the Toffehi variety. The activity in fact was affected especially by the tested variety and not by the solvent extraction, the Dhokkar variety being the most active one as mentioned above.
authors.affiliation: Laboratoire Matériaux-Molécules et Applications, IPEST, University of Carthage, La Marsa, Tunisia. ines.sifaoui@hotmail.com
authors.forename: Ines
authors.initials: I
authors.lastname: Sifaoui
authors.forename: Atteneri
authors.initials: A
authors.lastname: López-Arencibia
authors.forename: Carmen Ma
authors.initials: CM
authors.lastname: Martín-Navarro
authors.forename: Nadia
authors.initials: N
authors.lastname: Chammem
authors.forename: Mondher
authors.initials: M
authors.lastname: Mejri
authors.forename: Jacob
authors.initials: J
authors.lastname: Lorenzo-Morales
authors.forename: Manef
authors.initials: M
authors.lastname: Abderabba
authors.forename: José E
authors.initials: JE
authors.lastname: Piñero
mesh_terms: D000048:Acanthamoeba / Q000187:drug effects* / Q000502:physiology; D000818:Animals; D031658:Olea / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry*; D053058:Trophozoites / Q000187:drug effects* / Q000502:physiology; D014416:Tunisia
chemical_list: D010936:Plant Extracts