Biobleach boosting effect of recombinant xylanase B from the hyperthermophilic Thermotoga maritima on wheat straw pulp

被引：0
作者：
Z. Q. Jiang
X. T. Li
S. Q. Yang
L. T. Li
Y. Li
W. Y. Feng
机构：
[1] China Agricultural University,Department of Biotechnology, College of Food Science and Nutritional Engineering
[2] China Agricultural University,College of Biological Sciences
[3] China Agricultural University,Biotechnology Laboratory
[4] China National Pulp and Paper Research Institute,undefined
来源：
Applied Microbiology and Biotechnology | 2006年 / 70卷
关键词：
Wheat Straw; Kraft Pulp; Active Chlorine; Kappa Number; Tensile Index;
D O I：
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中图分类号：
学科分类号：
摘要：
The recombinant xylanase B (XynB) of Thermotoga maritima MSB8 was found to be highly specific towards xylans and exhibit very low activity towards carboxymethylcellulose in previous study. XynB was thermostable at neutral to alkaline pH region at 90°C and retained more than 90% activity after 1 h over the pH range of pH 6.1 to 11.1. The suitability of XynB for use in the biobleaching of wheat straw pulp was investigated. Pretreatment of the pulp with XynB resulted in a substantial improvement in the bleachability of wheat straw pulp. When XynB at 10 U g−1 was used to treat wheat straw pulp, it reduced pulp kappa number by 1.1 point, enhanced pulp brightness by 5.5% (% ISO) and improved other pulp properties, such as tensile index and breaking length. Biobleaching of wheat straw pulp with XynB saved active chlorine up to 34.5% while still maintaining the brightness at the control level. Besides, pretreatment of pulp with XynB was also effective at an alkaline pH as high as pH 10.1. This is the first report on the potential application of XynB from T. maritima MSB8 in the pulp and paper sector.
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页码：65 / 71
页数：6
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