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Screening and Statistical Optimization of Physiochemical Parameters for the Production of Xylanases from Agro-Industrial Wastes

DOI: 10.4236/aer.2016.41003, PP. 20-33

Keywords: Xylanases, Wheat Straw, Enzyme Kinetics, F. fomentarius, Siris Pods

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Abstract:

Xylanases are mostly produced through submerged fermentation; nonetheless solid-state fermentation has increased profound attention and consideration of scholars having high conversion level biomass to energy conservation. This study depicted the purification of xylanases and their possible utilization in industry. The present study was carried out to examine the culture influence of fungal strain Fomes fomentarius (F. fomentarius) using different agro-industrial residues (wheat straw, rice husk, sugarcane bagasse and siris pods). F. fomentarius showed maximum enzyme production after 72 h of fermentation, when grown on wheat straw in solid state fermentation process while maximum activity showed on pH 6.0 at 30°C. The other parameters optimized by statistical design (RSM) showed maximum xylanase activity (146 ± 8 IU/mL) at 65% moisture content, 4 mL inoculums size, 175 mg Ammonium sulphate, 200 mg Calcium carbonate and 1.4 grams of glucose. Xylanase was salted out at 60% ammonium sulphate concentration and enzyme was further purified by Sephadex G-100 gel filtration chromatography with 2.2 fold increase in activity. The purified xylanase from F. fomentarius had optimum pH 6.0 and 40°C. Xylanase showed higher specificity for oat spelt xylan with kinetic constants Km 1.25 mg/mL and Vmax 54 mM/min. Xylanases have an industrial important enzyme used extensively in food, feed and paper industry.

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