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Figure 1 The four major forms of vitamin E (a-, ,3-, 7-, and ¿-tocopherols) differ by the number and positions of methyl groups on the chromonol ring. In a-tocopherol, the most biologically active form, the chromonol ring is fully methylated. In ,3- and 7-tocopherols, the ring contains two methyl groups, whereas ¿-tocopherol is methylated in one position. The corresponding tocotrienols have the same structural arrangement except for the presence of double bonds on the isoprenoid side chain of C31, C71, and C111.

Figure 1 The four major forms of vitamin E (a-, ,3-, 7-, and ¿-tocopherols) differ by the number and positions of methyl groups on the chromonol ring. In a-tocopherol, the most biologically active form, the chromonol ring is fully methylated. In ,3- and 7-tocopherols, the ring contains two methyl groups, whereas ¿-tocopherol is methylated in one position. The corresponding tocotrienols have the same structural arrangement except for the presence of double bonds on the isoprenoid side chain of C31, C71, and C111.

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