title: Olea europaea L. leaf extract and derivatives: antioxidant properties.
abstract: This paper reports a very simple and fast method to collect eluates with high amounts of hydroxytyrosol, biotransforming Olea europaea L. leaf extract by a thermophilic beta-glycosidase immobilized on chitosan. Some phenolic compounds in the leaf tissue and in the eluates obtained by biotransformation are identified. To propose the eluates as natural substances from a vegetal source, their antioxidant properties have been compared with those of the leaf extract from which they are originated. The eluates possess a higher concentration of simple phenols, characterized by a stronger antioxidant capacity, than those available in extra virgin olive oils and in many tablets of olive leaf extracts, commercially found as dietetic products and food integrators.
authors.affiliation: Istituto di Biochimica delle Proteine ed Enzimologia del CNR, Via Marconi 10, 80125 Napoli, Italy.
authors.forename: Raffaella
authors.initials: R
authors.lastname: Briante
authors.forename: Maurizio
authors.initials: M
authors.lastname: Patumi
authors.forename: Stefano
authors.initials: S
authors.lastname: Terenziani
authors.forename: Ettore
authors.initials: E
authors.lastname: Bismuto
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Febbraio
authors.forename: Roberto
authors.initials: R
authors.lastname: Nucci
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D002849:Chromatography, Gas; D004800:Enzymes, Immobilized; D008401:Gas Chromatography-Mass Spectrometry; D006026:Glycoside Hydrolases; D029592:Oleaceae / Q000737:chemistry*; D000069463:Olive Oil; D010636:Phenols / Q000032:analysis; D010626:Phenylethyl Alcohol / Q000031:analogs & derivatives* / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry
chemical_list: D000975:Antioxidants; D004800:Enzymes, Immobilized; D000069463:Olive Oil; D010636:Phenols; D010936:Plant Extracts; D010938:Plant Oils; C005975:3,4-dihydroxyphenylethanol; D006026:Glycoside Hydrolases; D010626:Phenylethyl Alcohol