Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (12): 139-144.

• Biological Engineering • Previous Articles     Next Articles

Performance of Xylanase S7 for DQP Bleaching of Non-Wood Kraft Pulps

Lin Ying  Zhang Na  Zheng Sui-ping  Han Shuang-yan   

  1. School of Biological Science and Engineering,South China University of Technology,Guangzhou 510006,Guangdong,China
  • Received:2012-05-18 Revised:2012-07-25 Online:2012-12-25 Published:2012-11-02
  • Contact: 韩双艳(1976-)，女，副教授，硕士生导师，主要从事酶工程研究．E-mail:syhan@scut．edu．cn E-mail:feylin@ scut.edu.cn
  • About author:林影(1962-) ，女，教授，博士生导师，主要从事微生物酶学研究．
  • Supported by:

    广东省工业攻关项目( 2010A010500003)

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Abstract:

Three kinds of non-wood pulps,namely,wheat straw pulp,reed pulp and bamboo pulp,were pretreated at 70℃ and pH9.0 with xylanase S7 secreted by recombinant Pichia pastoris and were then treated with chlorinefree DQP bleaching. Then,the aid-bleaching effect of xylanase S7 was compared with those of two kinds of commercial xylanases AU-PE89 and Pulpzyme HC. The results indicate that,with the same bleaching reagent consumption,the non-wood pulps treated with xylanase S7 are of a brightness increment of more than 1%ISO,a lower Kappa number and better physical properties,which means that xylanase S7 possesses an aid-bleaching effect similar to those of the commercial enzymes. Moreover,it is found from SEM results that,after the enzymatic pre-treatment,the fiber surface changes obviously.

Key words: xylanase, non-wood pulp, DQP bleaching, bio-bleaching

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