HPLC Determination of Vitamin E in Feed Materials, Compounded Feeds and Foods
aCentral Institute for Supervising and Testing in Agriculture Brno, National Reference Laboratory, Plzeň, bZentiva, Co., Prague
Vitamin E is a collective term for fat-soluble chroman-6-ol derivatives that exhibit biological activity of α-tocopherol. At present, eight such derivatives are included in the vitamin E family: α-,?? β-,γ- and δ-tocopherol and α-,β-,γ- and δ-tocotrienol. The vitamin E content in food and feeds is expresed as that of α-tocopherol. The aim of this paper was to monitor the content of tocopherols and tocotrienols in food and feed materials and their mixtures. The contents were recalculated as α-tocopherol equivalents (α-TE). The α-toco¬pherol contents and α-TEs were compared. The content of the other tocopherols and tocotrienols in food and compounded feeds does not significantly contribute to the α-TEs.
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