We investigated the changes of antioxidant activity and bioactive compounds in bran, rice husk and
ground rice husk after three different treatments, namely hot-air, far-infrared radiation (FIR), and cellulase,
compared with raw samples. Overall, FIR-treated group showed a higher DPPH radical scavenging
activities, ferric reducing antioxidant power (FRAP), and total phenolic content (TPC) than did hot-air
and cellulase treatments for all samples. A significant increase in a- and c-tocopherols was found in
FIR irradiated rice bran compared to raw bran, while a- and c-tocopherols in hot-air and cellulase treated
rice bran were remained unchanged. Cellulase significantly increased the amount of vanillic acid; however
a dramatic decrease of ferulic acid was observed. The contents of c-oryzanol in cellulase treated
ground rice husk were significantly increased. Decreasing particle size in the husk was found to work
positively for enhancing antioxidant activities, c-oryzanol and phenolic compounds.
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