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STUDIES ON PROPERTIES AND APPLICATIONS OF XYLANASE PRODUCED BY ASPERGILLUS NIGER S13

ZHAN JiXun,LIU TingZhi,TIAN ShengYan,WANG DePei,DING YouFang(School of Food Science and bioengineering,Tianjin University of Science and Technology, Tianjin 300222, China)  
The optimum temperature and pH of xylanase reaction is 50 ℃ and 4~6. Xylanase is stable at pH 1~12. It is unstable when heated and only 165% of activity remained after 1 h at 60 ℃. Xylanase is inhibited by most metal ions, of which Cu2+ have a highest inhibition rate. When applied in feed fermentation and prebleaching of pulp, xylanase can decrease fiber in feed, improve paper properties and decrease pollution.
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