Original Article | 2011, Vol.33, No.5, pp. 509-515
Chemical analysis and antioxidant properties of foxtail millet bran extracts
Issoufou Amadou, Tidjani Amza, Yong-Hui Shi and Guo-Wei Le
pp. 509 - 515
Abstract
The aim of this research was to extract phenolic compounds and assess the antioxidant potential of defatted foxtail millet bran (DFMB) extracts. Distilled water, 30%, 50%, and 70% ethanol were used as solvent for extraction. The proximate composition, fatty acid analysis, total phenolic content and extraction yield were carried out. The antioxidant efficacies of DFMB extract were tested using 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2’-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS), superoxide radical and reducing power. The highest inhibitory concentration (IC50) values scavenging on DPPH,
ABTS and superoxide radicals were in the range of 0.131±0.002, 0.795±0.003, and 0.158±0.009 mg/ml, for distilled water, and 30 and 50% ethanol extracts respectively. The reducing power increased with increase of sample concentration. Total phenolic content ranged from 21.49±3.26 to 29.39±1.36 gallic acid equivalent (GAE)/100 g extract. The phenolic content and antioxidant activity in DFMB extracts were significantly correlated (p<0.05). These results indicated that 50% ethanol extract from DFMB appeared to be the most promoting phenolic compound with substantial antioxidant activity.
