Grasas y Aceites, Vol 65, No 1 (2014)

Antioxidant capacity of the phenolic fraction and its effect on the oxidative stability of olive oil varieties grown in the southwest of Spain

M. N. Franco
Technological Agri-Food Institute (INTAEX), Spain

T. Galeano-Díaz
bAnalytical Chemistry Department. University of Extremadura, Spain

J. Sánchez
Technological Agri-Food Institute (INTAEX), Spain

C. De Miguel
Vegetal Biology, Ecology and Soil Sciences Department. University of Extremadura, Spain

D. Martín-Vertedor
Technological Agri-Food Institute (INTAEX), Spain


The characterization of olive oils from seven representative fruit varieties (Arbequina, Carrasqueña, Corniche, Manzanilla Cacereña, Morisca, Picual, and Verdial de Badajoz) from the southwest of Spain is carried out according to antioxidant capacity of the phenolic fraction and oxidative stability in different ripening stages. Antioxidant capacity is measured through the reduction of a 2,2′-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid radical cation previously oxidized with peroxidase/hydrogen peroxide. The decrease in absorbance at 730 nm at 3 min was measured. Values like Trolox Equivalents Antioxidant Capacity and oxidative stability varied from 0.6 to 2.5 mmol Trolox·kg–1 oil and 28.3 to 170.9 hours Rancimat respectively. The best positive correlation between total phenolic compounds and antioxidant capacity were in the Carrasqueña and Arbequina varieties. The rest showed moderated correlations. Correlation between antioxidant capacity and oxidative stability was found in a range from 0.66 to 0.97, depending on varieties.


ABTS radical cation; Antioxidant capacity; Olive oil; Oxidative stability; Phenolics

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