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http://dx.doi.org/10.4014/jmb.0909.09017

Optimization of Hydroxyl Radical Scavenging Activity of Exopolysaccharides from Inonotus obliquus in Submerged Fermentation Using Response Surface Methodology  

Chen, Hui (School of Science, Zhejiang Sci-Tech University)
Xu, Xiangqun (School of Science, Zhejiang Sci-Tech University)
Zhu, Yang (TNO Quality of Life, Department of Bioscience)
Publication Information
Journal of Microbiology and Biotechnology / v.20, no.4, 2010 , pp. 835-843 More about this Journal
Abstract
The objectives of this study were to investigate the effect of fermentation medium on the hydroxyl radical scavenging activity of exopolysaccharides from Inonotus obliquus by response surface methodology (RSM). A two-level fractional factorial design was used to evaluate the effect of different components of the medium. Corn flour, peptone, and $KH_2PO_4$ were important factors significantly affecting hydroxyl radical scavenging activity. These selected variables were subsequently optimized using path of steepest ascent (descent), a central composite design, and response surface analysis. The optimal medium composition was (% w/v): corn flour 5.30, peptone 0.32, $KH_2PO_4$ 0.26, $MgSO_4$ 0.02, and $CaCl_2$ 0.01. Under the optimal condition, the hydroxyl radical scavenging rate (49.4%) was much higher than that using either basal fermentation medium (10.2%) and single variable optimization of fermentation medium (35.5%). The main monosaccharides components of the RSM optimized polysaccharides are rhamnose, arabinose, xylose, mannose, glucose, and galactose with molar proportion at 1.45%, 3.63%, 2.17%, 15.94%, 50.00%, and 26.81%.
Keywords
Inonotus obliquus; exopolysaccharides; hydroxyl radical scavenging activity; medium optimization; response surface methodology; monosaccharides component;
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