Antioxidative activities of algal extracts, synergistic effect with vitamin E

Autor: Le Tutour, Bernard
Zdroj: Phytochemistry; January 1990, Vol. 29 Issue: 12 p3759-3765, 7p
Abstrakt: The antioxidant effect of seven species of marine algae on the preservation of sunflower oil were investigated by storage experiments at 75°. Laminaria digitata(Kombu) and Himanthalia elongatawere the most effective in extending the induction period. Extracts of these two seaweeds were then compared with vitamin E and BHT as regards to their antioxidative activities, by kinetic studies in a model system. The thermal initiated oxidation of methyl linoleate was performed at 60° in heptanol, with or without antioxidants. When they reached 1 % of the substrate, seaweed extracts exhibited antioxidant activities by extending the induction period but they were not actually effective. Effects of the addition of algal extracts together with vitamin E on the preservation of methyl linoleate, sunflower oil or mixed ethyl eicosapentaenoate and docosahexaenoate were investigated at 60° by the same kinetic studies. Algal extracts synergistically enhance the antioxidant effect of vitamin E when the latter is present at a level higher than 1 × 10−4M. On mechanistic grounds, the understanding of this synergism is outlined. Seaweed extracts should find applications in the cosmetic and food industries without any further purification.
Databáze: Supplemental Index