制浆造纸用木聚糖酶的研究进展

Production and Application of Xylanase Preparations for Pulp and Paper Industry

用现代生物技术改造传统制浆造纸工业，可以减少环境污染，降低工艺能耗，提高产品质量等，是该行业今后发展的重要方向之一［１］。微生物酶制剂在制浆造纸工业中有非常广泛的用途，例如，利用木素酶处理纤维原料，来降低能耗，代替或部分代替污染严重的化学法制浆；利用...

Abstract There is an increasing interest in applying xylanase to the pulp bleaching process to reduce the amounts of chlorine used in bleaching processes as well as improve the quality of pulp produced.Cellulase may also be used for the improvement of pulp property,such as to enhance drainage. Aspergillus niger An 76 was isolated to produce xylanase (350 IU/ml).When the enzyme was used to treat the Kraft pulp, a brightness of 6.8% more than that of the untreated one using the same chlorine dosage,or a saving of nearly 50% of chlorine consumption with the same brightness,was realized. When the enzyme was used to treat bleached wheat straw pulps,an obvious improvement of breaking length,drainage,viscosity and fragility of the pulp was obtained.This gives the hope that the high grade paper may be produced by this technique from agricultural residues instead of wood.This is very important for ecosystem protection in a world view,and is important for economic balance in the forest inadequate countries such as China. An alkali tolerant strain of Pseudomonas was also isolated from soil and used for xylanase production.Under the optimal conditions, Pseudomonas sp.G6 2 can produce more than 300 IU/ml xylanase.The alkali tolerant property of the enzyme is suitable for using in pulp industry.Comparison of the treatment results between the two kinds of xylanases,the bacterial xylanase is superior to the fungal xylanase in improving fragility.However,it is in reverse order in increasing strength property (breaking length).