title: Effect of cultivar and processing method on the contents of polyphenols in table olives.
abstract: Polyphenols were determined by HPLC in the juice and oil of packed table olives. The phenolic compositions of the two phases were very different, hydroxytyrosol and tyrosol being the main polyphenols in olive juice and tyrosol acetate, hydroxtyrosol acetate, hydroxytyrosol, tyrosol, and lignans (1-acetoxypinoresinol and pinoresinol) in oil. The type of processing had a marked influence on the concentration of polyphenols in olive juice and little on the content in oil. The analyses carried out on 48 samples showed that turning color olives in brine had the highest concentration in polyphenols ( approximately 1200 mg/kg), whereas oxidized olives had the lowest ( approximately 200 mg/kg). Among olive cultivars, Manzanilla had a higher concentration than Hojiblanca and Gordal. The type of olive presentation also influenced the concentration of polyphenols in olives, decreasing in the order plain > pitted > stuffed. The results obtained in this work indicate that table olives can be considered a good source of phenolic antioxidants, although their concentration depends on olive cultivar and processing method.
authors.affiliation: Food Biotechnology Department, Instituto de la Grasa (CSIC), Avenida Padre García Tejero 4, Seville, Spain.
authors.forename: Concepción
authors.initials: C
authors.lastname: Romero
authors.forename: Manuel
authors.initials: M
authors.lastname: Brenes
authors.forename: Khaled
authors.initials: K
authors.lastname: Yousfi
authors.forename: Pedro
authors.initials: P
authors.lastname: García
authors.forename: Aranzazu
authors.initials: A
authors.lastname: García
authors.forename: Antonio
authors.initials: A
authors.lastname: Garrido
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis*; D005511:Food Handling / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D031658:Olea / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis*; D010626:Phenylethyl Alcohol / Q000031:analogs & derivatives* / Q000032:analysis; D059808:Polyphenols; D013045:Species Specificity
chemical_list: D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; C005975:3,4-dihydroxyphenylethanol; C011867:4-hydroxyphenylethanol; D010626:Phenylethyl Alcohol