Conclusions
The amounts of tocols and γ-oryzanol observed in indica raw
brown rice of different cultivars grown in Brazil were little influenced
by location or cultivar and variation was comparable to rice grown
under different climatic, environmental conditions and year of harvest
as previously reported by our working group.
In raw rice γ-tocotrienol, the most abundant homologue, was
responsible for ¾ of the total vitamin E content.
The combined treatments, parboiling, a 6-month period storage,
and cooking, led to a significant loss in the concentrations of
total tocols in brown rice and only little more than 10% of original
γ-tocotrienol content remained.