Rest Plant Materials with Natural Antioxidants Increase the Oxidative Stability of Omega-3-Rich Norwegian Cold Pressed Camelina sativa Oil

Abstract

The quality of Norwegian cold pressed camelina oil for human consumption and fish feed production, with a special focus on plant rest materials, natural antioxidants, and oxidation products is studied. Both crude oil with plant rest materials (CCO) and centrifuged oil (CO) were highly unsaturated with 39.4% (w/w) α-linolenic acid. The oils were oxidatively stable for 12 months at long-term storage conditions at 4 °C. Lipid oxidation was observed in CO but not in CCO, between 6 and at 9 months at 20 °C. This difference was even higher at accelerated conditions at 40 °C with an increase in PV, AV, and secondary oxidation products and a decrease in tocopherols after 2 weeks in CO but not in CCO. This indicates there are natural antioxidants with stronger antioxidant capacity than tocopherols in association with the plant rest materials in CCO. The polyphenol rutin with antioxidative properties might be a good candidate but needs further studies.