Production of Thermostable a-amylase by Bacillus cereus MK in solid state fermentation: Partial purification and characterization of the enzyme

10.5580/1542 ◽  
2010 ◽  
Vol 8 (1) ◽  
2014 ◽  
Vol 11 (2) ◽  
pp. 1056-1061
Author(s):  
Baghdad Science Journal

Three strain of Bacillus cereus were obtained from soil sours Laboratories of Biology Department/ College of Science/ University of Baghdad. The bacteria secreted extracellular xylanase in liquid cultur the test ability of xylanase production from these isolates was studied semi quantitative and quantitative screening appeared that Bacillus cereus X3 was the highest xylanase producer. The enzyme was partial purification 191 fold from cultur by reached step by 4 U/mg proteins by ammonium sulfat precipitation 80%, Ion exchang DEAE-cellulos chromatography Characterization study of the partial purifation enzyme revealed that the enzyme had a optimum activity pH8 and activity was stable in the pH rang (8-10) for 30min. maximal activity was attained at 50C


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