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Zhang Xiao;Zhang Datong;Li Zhongzheng(Manjing Forestry University,Hanjing 210037)Gao Peiji(Shandong University,Jinan 250100)  
E-An-76 is a hemicellulase preparation from Aspergillus niger which has a xylanase activity of235 IU/mL and contains low levels of cellulase activities. The potential of this hemicellulase as a bleachingbooster in CEH process was studied.The results showed that birch KP pretreated with E-An-76 beforeCEH process could get a brightness 6.8%higher than that of the untreated one under the same chlorinedosage,or it can save nearly 50%of chlorine consumption for the same brightness.The yield decreasedslightly with no adverse effect on strength properties,Wheat straw pulp pretreated with E-An-76 beforeCEH process could get a brightness about 11%higher than the control's,but the yield decreased signifi-cantly. It was found by studying the reducing sugars and carbonhydrate composition in birch KP hydrolysatedegraded by E-An-76,that the reprecipitated or readsorbed xylan appeared to play an important role in themechanism of hemicellulase-aided bleaching.
【CateGory Index】: TS749
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