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Determination of polyphenols, tocopherols, and antioxidant capacity in virgin argan oil ( Argania spinosa , Skeels)

2011; Wiley; Volume: 113; Issue: 7 Linguagem: Inglês

10.1002/ejlt.201000503

1438-9312

Rocío Marfil, Rafael Giménez, Olga Martínez‐Augustin, Paula R. Bouzas, José Ángel Rufián‐Henares, Marta Mesías, Carmen Cabrera–Vique,

Free Radicals and Antioxidants

Abstract This study establishes data on polyphenols, tocopherols, and antioxidant capacity (AC) of virgin argan oil. A total of 22 samples from Morocco were analyzed. Total polyphenol content ranged between 6.07 and 152.04 mg GAE/kg. Total tocopherols varied between 427.0 and 654.0 mg/kg, being γ‐tocopherol the major fraction (84.68%); α ‐, β ‐, and δ ‐tocopherols represent 7.75, 0.33, and 7.29%, respectively. No influence of oil extraction method on total tocopherols was observed. The AC of argan virgin oils determined by the ABTS method in n ‐hexane oils dilution ranged between 14.16 and 28.02 mmol Trolox/kg, and by the ABTS, DPPH, and FRAP methods in methanolic oil extracts between 2.31–14.15, 0.19–0.87, and 0.62–2.32 mmol Trolox/kg, respectively. A high correlation was found between ABTS and DPPH methods applied to a methanolic oil extract. Virgin argan oil presents a higher polyphenol and tocopherol content, and total AC than other edible vegetable oils.