buckwheat flours. Those values were 34.24 and 31.26 mg/mL, and 1.87 and
1.49 mg/mL for wheat and buckwheat flours, respectively.
Reduction of DPPH radicals reveals that examined extracts possess radical
inhibitors or scavengers with possibility to act as primary antioxidants.
They might react with free radicals, particularly with the peroxy radicals,
which are the major propagators of the auto-oxidation chain of fat, thereby terminating
the chain reaction (S h a h i d i and Wa n a s u n d a r a, 1992). Based
on the results obtained, the antioxidative activity of investigated extracts, particularly
buckwheat extracts, could in part be markedly caused by their radical
scavenging properties. Wa t a n a b e (1997) and Wa t a n a b e and co-workers
(1998) reported that flavonoids, first of all rutin, isolated from buckwheat
hulls showed radical scavenging activity. Also, S u n and H o (2005) reported
powerful antiradical activity on DPPH radicals of ethanolic extract of
whole buckwheat grain, but our results are not completely comparable because
of differences in applied methods.