Antioxidant activity of olive pulp and olive oil phenolic compounds of the arbequina cultivar.
The aim of this study was to characterize antioxidant activities of phenolic compounds that appear in olive pulp and olive oils using both radical scavenging and antioxidant activity tests. Antiradical and antioxidant activities of olive pulp and olive oil phenolic compounds were due mainly to the presence of a 3,4-dihydroxy moiety linked to an aromatic ring, and the effect depended on the polarity of the phenolic compound. Glucosides and more complex phenolics exhibited higher antioxidant activities toward oxidation of liposomes, whereas in bulk lipids aglycons were more potent antioxidants with the exception of oleuropein. Lignans acted as antioxidants only in liposomes, which could partly be due to their chelating activity, because liposome oxidation was initiated by cupric acetate. The antioxidant activity of virgin olive oil is principally due to the dialdehydic form of elenolic acid linked to hydroxytyrosol (3,4-DHPEA-EDA), a secoiridoid derivative (peak RT 36, structure unidentified), and luteolin.
Morelló
José-Ramón
JR
Food Technology Department, CeRTA-TPV, Escuela Técnica Superior de Ingeniería Agraria, Universidad de Lleida, Av/Alcalde Rovira Roure 191, 25198 Lleida, Spain.
Vuorela
Satu
S
Romero
Maria-Paz
MP
Motilva
Maria-José
MJ
Heinonen
Marina
M
D000975:Antioxidants / Q000032:analysis* / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D016166:Free Radical Scavengers; D005638:Fruit / Q000737:chemistry; D008041:Linoleic Acids / Q000737:chemistry; D015227:Lipid Peroxidation / Q000187:drug effects; D008081:Liposomes / Q000737:chemistry; D031658:Olea / Q000737:chemistry*; D000069463:Olive Oil; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis* / Q000494:pharmacology; D010938:Plant Oils / Q000737:chemistry*
D000975:Antioxidants; D016166:Free Radical Scavengers; D008041:Linoleic Acids; D008081:Liposomes; D000069463:Olive Oil; D010636:Phenols; D010938:Plant Oils; C005575:methyl linoleate