Changes occurring in phenolic content, tocopherol composition and oxidative stability of Camelina sativa oil during storage

Changes occurring during storage in the content of polar phenolic compounds, the composition of tocopherols (T), the presence of primary and secondary oxidative products and titratable acidity in oil obtained from the seeds of Camelina sativa were studied. In fresh oil the content of polar phenolic compounds amounted to 128 mg/kg (expressed as chlorogenic acid), the content of alpha-T was (41 +/- 8) mg/kg, of gamma-T (710 +/- 19) mg/kg and of delta-T (12 +/- 3) mg/kg. beta-T and tocotrienols were not detected. In oil stored at 50 degrees C the concentration of total tocopherols decreased to a value of (440 13) mg/kg in 15 days. In that time the content of polar phenolic compounds in the oil stored at 50 degrees C was reduced to 72% of its initial value. The content of polar phenolic compounds in oil stored at 65 degrees C for 15 days was reduced to 21% of its initial value. The content of polar phenolic compounds in the C saliva oil investigated decreased linearly with peroxide value and with p-anisidine value. The antioxidative activity of polar phenolic compounds extracted from camelina oil was also elucidated. Analysis revealed that the phenolic extract obtained from camelina oil added to a model lipid system for a certain time significantly retarded the process of autooxidation. (c) 2007 Elsevier Ltd. All rights reserved.