Antioxidant Interrelationship

Any molecule with an atom that contains a single unpaired electron in its outer orbit is termed an oxidant. These atoms are unstable and have a strong attraction for the electrons of other atoms or molecules in order to regain their resting state. The process of transferring electrons to the oxidant is termed oxidation, and a new free radical is formed in the process.[3] The process can be self-perpetuating in unsaturated fatty acids found in membrane phospholipids and lipoproteins unless a more reactive electron donor, such as a-tocopherol, is introduced, whereupon the chain reaction is blocked. As described earlier, when lipid hydroperoxides are oxidized to peroxyl radicals, the peroxyl radicals react with a-tocopherol much faster than with other polyunsaturated fatty acids. The result is a corresponding organic hydroperoxide and an a-tocopheroxyl radical. The a-tocopheroxyl radical leaves the cell membrane lipid bilayer and enters the surrounding aqueous medium where glutathione perox-idase can use an electron from glutathione to restore a-tocopherol to its active or reduced state. Thus, although Se and vitamin E fulfill distinct functions, an inadequate supply of either can exacerbate the metabolic demand for the other.[8]

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