together the potential scavenging abilities of phenolic
substances might be due to the active hydrogen donor
ability of hydroxyl substitution. Similarly, Hagerman et al.
(1998) have also suggested that high molecular weight and
the proximity of many aromatic rings and hydroxyl groups
are more important for the free radical scavenging by
tannins than their specific functional groups.
3.3. Antioxidant activity in linoleic acid emulsion system
The antioxidant effects of the extracts from un-processed
and dry heated seed coat samples of tamarind, ascorbic
acid and BHA on the peroxidation of linoleic acid were
investigated and the results are presented in Fig. 2. At a
concentration of 500 mg in the final reaction mixture, the
raw and dry heated seed coat samples of both solvent
extracts inhibited 64.5–71.7% peroxidation of linoleic acid
after incubation for 72 h (three days). However, the
observed values in aqueous acetone extracts of both
samples were found to be higher than the methanol