The contribution to vitamin E content of
the eight isomers in these studies was also different. The discrepancies
between studies could be due, at least in part, to the fact
that different genotypes were studied, as different genotypes may
contain different amounts of vitamin E. These studies also differed
in the extraction methods used, that is, whether saponification
was used and which solvent. Methods using saponification and hexane
as a solvent are currently regarded as the most reliable for tocol
extraction in cereals because esterification is prevented and recovery
is greatest