| dc.description.abstract | Three kinds of brown rice (white rice, red rice and black rice) grown in
Vietnam were used to extract their bioactive compounds by alcoholic method and
total phenolic and flavonoid contents of the extract were investigated. DPPH radical
scavenging assay was used to measure the antioxidant capacity of phenolic extracts
and carbohydrate-hydrolyzing enzyme inhibitory capacity also is determined. The
results show that phenolic and flavonoid compounds were mainly located in free
form in the brown rice which was easily extracted by methanol solvents. In the
present study, red rice extracts possessed the best antioxidant activity (78.79 %) in
most cases, and showed the strongest inhibitory potential against alpha-amylase
(78.56%) and alpha-glucosidase (36.13%) as well. Our study also showed that
there were positive relationship among total phenolic contents, antioxidant capacity
and carbohydrate-hydrolyzing enzyme inhibition activity. Brown rice extracts could
act like both antioxidant and enzyme inhibitors and have a potential to be used in
prevention of type 2 diabetes. It also confirmed that brown rice are not only
consumed as functional foods but also used as pharmaceutical medicines.
Keyword: alpha-amylase, alpha-glucosidase, antioxidant activity, brown rice,
diabetes, flavonoid, phenolic. | en_US |
