Czech J. Food Sci., 2014, 32(1):102-108 | DOI: 10.17221/217/2013-CJFS

Stability of fried olive and sunflower oils enriched with Thymbra capitata essential oilOriginal Paper

Maria G. MIGUEL¹, Maria D. ANTUNES², Abdulrahman ROHAIM², Ana Cristina FIGUEIREDO³, Luís G. PEDRO³, José G. BARROSO³

¹ Department of Chemistry and Pharmacy and

² Department of Biology and Bioengineering, University of Algarve, Institute for Biotechnology and Bioengineering, University of Algarve, Plant Biotechnology Centre, Campus de Gambelas, Faro, Portugal

³ Plant Biology Department, Institute for Biotechnology and Bioengineering, Plant Biotechnology Centrer, Faculty of Sciences of Lisbon, University of Lisbon, Campo Grande, Lisboa, Portugal$2

The stability of olive and sunflower oils for domestic uses after frying cow steak or only heating were evaluated in the presence or absence of the carvacrol-rich essential oil of Thymbra capitata. The treatments consisted of sunflower and olive oils either enriched with 200 mg/l of T. capitata oil or without it, heating at 180°C for 20 min, or frying 100 g cow steak at the same temperature and for the same period of time. In all assays, acid, peroxide, and p-anisidine values were followed over time. The fatty acid profile was estimated before heating or frying as well as at the end of the experiment. The results showed that the type of fat as well as the type of treatment (frying or heating) was determinant for the acid, peroxide, and p-anisidine values found. The presence of the essential oil also demonstrated to affect those values depending on the type of the oil as well as on the type of the treatment (frying or heating). In contrast, the fatty acid profile did not change greatly.

Keywords: vegetable oils; frying; heating; fatty acids

Published: February 28, 2014  Show citation