Studies of tocopherol dimers from soybean oil by reaction gas chromatography

Reaction gas chromatography was found to be helpful in elucidating structures of tocopherol dimers. By this method γ‐ and δ‐tocopherols were determined as monomers derived from tocopherol dimers, after isolation of the latter compounds from soybean oil. It was shown that gas chromatographic determination of tocopherols, as performed by injection of total unsaponifiables from soybean oil, will give results too high; the eluted tocopherols will account for both tocopherol monomers and dimers.