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Chemical analysis and antioxidant properties of foxtail millet bran extracts

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Author(s): Issoufou Amadou | Tidjani Amza | Yong-Hui Shi | Guo-Wei Le

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 33;
Issue: 5;
Start page: 509;
Date: 2011;
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Keywords: extraction | antioxidant activity | foxtail millet bran | total phenolic content

ABSTRACT
The aim of this research was to extract phenolic compounds and assess the antioxidant potential of defatted foxtailmillet bran (DFMB) extracts. Distilled water, 30%, 50%, and 70% ethanol were used as solvent for extraction. The proximatecomposition, fatty acid analysis, total phenolic content and extraction yield were carried out. The antioxidant efficacies ofDFMB 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 30and 50% ethanol extracts respectively. The reducing power increased with increase of sample concentration. Total phenoliccontent ranged from 21.49±3.26 to 29.39±1.36 gallic acid equivalent (GAE)/100 g extract. The phenolic content and antioxidantactivity in DFMB extracts were significantly correlated (p
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