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. Author manuscript; available in PMC: 2011 Apr 28.
Published in final edited form as: J Agric Food Chem. 2010 Apr 28;58(8):4844–4852. doi: 10.1021/jf904464u

Figure 1.

Figure 1

Structures of tocopherols/tocotrienols and the proposed metabolic pathways. The structures are illustrated with γ-tocopherol and γ-tocotrienol, which are both dimethylated at the 7- and 8- positions. The chromanol ring is trimethylated at 5-, 7-, and 8-positions in α-tocopherol, dimethylated at 5- and 8-positions in β-tocopherol, and methylated at 8-position in δ-tocopherol. The arrows (from right to left) indicate the sequential side chain degradation and the resulting metabolites.