appears to be due to differences in the frequencies associated
with methyl groups, particularly in lipids. Biochemical reactions
changing the frequencies of methyl groups in lipids and the
tocols possibly associated with them may therefore occur during
storage. This may lead to differences in the extractability of lipids
(Pomeranz & Chang, 1977) and therefore vitamin E. In stored grain,
reactions such as esterification may also prevent loss of vitamin E
due to reduction of vitamin E oxidation (