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.
2014 Elsevier Ltd. All rights reserved.
We investigated the changes of antioxidant activity and bioactive compounds in bran, rice husk andground 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 scavengingactivities, ferric reducing antioxidant power (FRAP), and total phenolic content (TPC) than did hot-airand cellulase treatments for all samples. A significant increase in a- and c-tocopherols was found inFIR irradiated rice bran compared to raw bran, while a- and c-tocopherols in hot-air and cellulase treatedrice bran were remained unchanged. Cellulase significantly increased the amount of vanillic acid; howevera dramatic decrease of ferulic acid was observed. The contents of c-oryzanol in cellulase treatedground rice husk were significantly increased. Decreasing particle size in the husk was found to workpositively for enhancing antioxidant activities, c-oryzanol and phenolic compounds. 2014 Elsevier Ltd. All rights reserved.
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