Antioxidant Activity, Phenolic and Flavonoid Contents from Dark Rice Bran Water Extracts
Keywords:
Antioxidant activity, Phenolic content, Flavonoid content, Dark rice bran water extractAbstract
This study aimed to evaluate the antioxidant activity, phenolic and flavonoid contents of dark rice bran water extracts of Luem Pua black glutinous, Mali Nil and Sung Yod. The results showed that Lua Pua black glutinous rice bran extract had the highest percent yield. All extracts were quantified for their antioxidant activity, phenolic content and flavonoids using DPPH, Folin-Ciocalteu and Aluminum chloride methods, respectively. The results showed that Luem Pua black glutinous rice bran extract represented the highest antioxidants (73.83±0.69%), although not significantly different to that of Mali Nil rice bran extract (72.70±0.47%). The Folin-Ciocalteu assay revealed that Mali Nil rice bran extract had the highest phenolic content (65.24±1.74 mg GAE/g). The phenolic content of Mali Nil rice bran extract was significantly different from Sang Yod rice bran extract (27.16±1.44 mg GAE/g) and Lum Pua black glutinous rice bran extract (38.47±1.44 mg GAE/g). The flavonoid contents of rice bran extracts were in the range of 0.02 - 0.05 mg QE/g. However, the flavonoid content of the three extracts was not significantly different from each other. This information can be used to develop healthy food products.
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