Mechanisms of antioxidant interactions in oil-in water emulsions: The influence of their physical locations and environmental pH
A classic example of synergistic antioxidant interactions can be observed between [alpha]-tocopherol (vitamin E) and ascorbic acid (vitamin C) in cell membranes. This synergism is due to "antioxidant regeneration" via the recycling of a stronger (primary) antioxidant with a weaker (secondary) antioxidant. By this principle, the primary antioxidant ([alpha]-tocopherol) scavenges free radicals in the lipid phase and is then regenerated by the secondary antioxidant (ascorbic acid). From a thermodynamic point of view, the reaction is favorable because the reduction potential of ascorbic add is much lower than a-tocopherol, indicating that ascorbic acid prefers to give an electron to oxidized [alpha]-tocopherol. From a physical property viewpoint, this reaction is also favorable because a-tocopherol is in the membrane where it can inactivate lipid radicals and yet is also at the membrane interface where it can react with ascorbic acid.
| Main Authors: | , , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | Q02 - Traitement et conservation des produits alimentaires, 000 - Autres thèmes, |
| Online Access: | http://agritrop.cirad.fr/570713/ http://agritrop.cirad.fr/570713/1/document_570713.pdf |
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