Abstract:
Search of therapeutic potential of natural and locally available food has
become a trend due to increasing health concerns among consumers
around the world. In this study, extracts of rice bran (Oryza sativa L.) and
selected beans (red bean, red kidney bean, and white bean) (Phaseolus
vulgaris L.) were obtained using 80% ethanol-water mixture to compare
their anti-hyperglycaemic and anti-oxidative potentials. The total phenolic
content (TPC), ferric reducing antioxidant power (FRAP), 2,2’-azino bis (3-ethylbenzothiazoline-6- sulfonic acid (ABTS) radical scavenging
activity, 2,2-diphenyl-1-picryl-hydrazylhydrate (DPPH) radical scavenging
activity, and the carbohydrate hydrolyzing enzyme inhibitory potentials
of the extracts were studied in-vitro using relevant assays. The highest
phenolic content (0.122 mg of Gallic Acid Equivalent /g of extract) was found with red bean extract. FRAP values of the extracts were found to
range from 48.98 to 75.94 µmol FeSO4
/g bran extract. The highest ferric
reducing power (75.94 µmol FeSO4
/g) was displayed by the bran extract of
red kidney bean. The highest inhibitory effect against α-amylase (96.18%)
was displayed by rice bran extract and the highest inhibitory effect against
α-glucosidase (39.57%) was exhibited by red bean extract. This study
concluded that the bran extracts of rice and the selected beans were potent
sources of natural antioxidants and good postprandial hyperglycaemia
regulators.
