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What is tocopherols
Vitamin E refers to a group of compounds known as which are the derivatives of a parent compound called as 'tocol'. Four tocopherols namely a, P, y and 6-tocopherols have been isolated. They differ from each other in the number and position of methyl groups attached to the aromatic nucleus. While fi and y- tocopherols have two methyl groups, a and 6-tocopherols have three and one methyl groups, respectively. All of these compounds possess comparable physiological properties, although a-tocopherol which is synthesized commercially is most potent. Some tocopherols are derivatives of tocotrienol, which has three double bonds in the aliphatic side chain. Structure of a-tocopherol is shown in Figure
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