title: Phenolic content and antioxidant activity of olive by-products and antioxidant film containing olive leaf extract.
abstract: The antioxidant activity of olive leaf (OL) and cake (OC) extracts with different solvents was evaluated. 70% of aqueous ethanol extract of OL was chosen as the most antioxidant extract based on antiradical activity (DPPH) (95.4±0.3%) and oxygen radical absorbance capacity (ORAC) (0.82±0.07g equivalent Trolox per g of solution) assays. This OL extract was incorporated in two multilayer materials consisting of (i) polyethylene/polyethylene (PE/PE) film and (ii) polyethylene/paper (PE/P). These multilayers were exposed to a gas stream enriched in free radicals to evaluate the scavenging capacity of both materials. PE/PE film exhibited the highest scavenging activity of free radicals (78.8%). Migration of the phenolic compounds from olive by-products into two simulants was performed and demonstrated a non-migrating behavior. The limits of detection and quantification for oleuropein were 0.5μgkg(-1) and 1.7μgkg(-1) and for Luteolin-7-O-glucoside 1.3μgkg(-1) and 4.3μg kg(-1) respectively.
authors.affiliation: Département des sciences Alimentaires, Faculté des Sciences dela Nature et de la Vie, Universitéde Bejaia, Route Targa Ouzemour, Bejaia 06000, Algeria.
authors.forename: M
authors.initials: M
authors.lastname: Moudache
authors.affiliation: Department of Analytical Chemistry, Aragon Institute of Engineering Research I3A, EINA-University of Zaragoza, Campus Rio Ebro, Torres Quevedo Building, María de Luna St. 3, E-50018 Zaragoza, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Colon
authors.affiliation: Department of Analytical Chemistry, Aragon Institute of Engineering Research I3A, EINA-University of Zaragoza, Campus Rio Ebro, Torres Quevedo Building, María de Luna St. 3, E-50018 Zaragoza, Spain. Electronic address: cnerin@unizar.es.
authors.forename: C
authors.initials: C
authors.lastname: Nerín
authors.affiliation: Département des sciences Alimentaires, Faculté des Sciences dela Nature et de la Vie, Universitéde Bejaia, Route Targa Ouzemour, Bejaia 06000, Algeria.
authors.forename: F
authors.initials: F
authors.lastname: Zaidi
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000378:metabolism; D005609:Free Radicals / Q000378:metabolism; D057888:Iridoid Glucosides; D039823:Iridoids / Q000737:chemistry / Q000378:metabolism; D031658:Olea / Q000737:chemistry* / Q000378:metabolism; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry* / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry* / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000975:Antioxidants; D005609:Free Radicals; D057888:Iridoid Glucosides; D039823:Iridoids; D010636:Phenols; D010936:Plant Extracts; C002769:oleuropein
keywords: Active packaging; Adhesive; Antioxidant; Free radical scavenger; Migration; Multilayer; Oleaeuropaea; Olive by-products