Effect of Various Levels of Marzeh Bakhtiari (Satureja bachtiarica Bunge) Extract and Essential Oil on the Stability of Flaxseed Oil

In the present study, Satureja bachtiarica Bunge extract (SBBE) and Satureja bachtiarica Bunge oil (SBBO) were used as effective antioxidants for stabilizing flaxseed oil (FSO). FSOs treated with different concentrations (0.5% and 1%) of SBBE and SBBO were prepared. The acid degree value (ADV), peroxide value (PV), para-anisidine value (pAV), Totox index, conjugated diene acids (CDAs), thiobarbituric acid–reactive substances (TBARS), antioxidant activity (DPPH), and fatty acid profile were measured after 35 days at 40°C. The results showed that SBBO was rich in bioactive compounds, including oxygenated monoterpenes, carvacrol, and γ-terpinene. On the 35th day, the amounts of ADV, PV, pAV, TBARS, Totox, and CDA in the control sample were 1.21 mg/g, 46.80 meq O₂/kg, 15.61, 2.43 mg MDA/g, 107.92, and 0.82%, respectively, which were significantly greater than those in the 1% SBBE and SBBO treatments (p < 0.05). The fatty acid profile showed that the content of unsaturated fatty acids (UFAs) in the FSO samples was greater than that of saturated fatty acids (SFAs). The UFA values were between 86.13% and 85.93%. The results of this study showed that SBBE and SBBO (1%) could be used as effective natural antioxidants for increasing the shelf life of FSO.