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Characterization of the total free radical scavenger capacity of vegetable oils and oil fractions using 2,2-diphenyl-1-picrylhydrazyl radical

AutorEspín de Gea, Juan Carlos ; Soler-Rivas, Cristina ; Wichers, Harry J.
Palabras claveAntioxidant
Radical scavenger
Thin-layer chromatography
Fecha de publicación29-feb-2000
EditorAmerican Chemical Society
CitaciónJournal of Agricultural and Food Chemistry 48(3): 648-656 (2000)
ResumenThe total free radical scavenger capacity (RSC) of 57 edible oils from different sources was studied: olive (24 brands of oils), sunflower (6), safflower (2), rapeseed (3), soybean (3), linseed (2), corn (3), hazelnut (2), walnut (2), sesame (2), almond (2), mixture of oils for salad (2), “dietetic” oil (2), and peanut (2). Olive oils were also studied according to their geographical origins (France, Greece, Italy, Morocco, Spain, and Turkey). RSC was determined spectrophotometrically by measuring the disappearance of the radical 2,2-diphenyl-1-picrylhydrazyl radical (DPPH•) at 515 nm. The disappearance of the radical followed a double-exponential equation in the presence of oils and oil fractions, which suggested the presence of two (fast and slow) groups of antioxidants. RSC was studied for the methanol-soluble phase (“methanolic fraction”, MF) of the oil, the fraction nonsoluble in methanol (“lipidic fraction”, LF), and the nonfractionated oil (“total oil”; TF = MF + LF). Only olive, linseed, rapeseed, safflower, sesame, and walnut oils showed significant RSC in the MF due to the presence of phenolic compounds. No significant differences were found in the RSC of olive oils from different geographical origins. Upon heating at 180 °C the apparent constant for the disappearance of RSC (kT) and the half-life (t1/2) of RSC for MF, LF, and TF were calculated. The second-order rate constants (k2) for the antiradical activity of some phenolic compounds present in oils are also reported.
Descripción9 pages, 8 figures, 3 tables.
Versión del editorhttp://dx.doi.org/10.1021/jf9908188
ISSN1520-5118 (Online)
0021-8561 (Print)
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