期刊
BIORESOURCE TECHNOLOGY
卷 165, 期 -, 页码 309-313出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.03.037
关键词
Xylanase; Bacillus pumilus; Kluyveromyces lactis; Expression; Alkali stability
资金
- University Grants Commission (UGC), New Delhi, India
This work aimed at studying the recombinant expression of an alkali-and thermo-stable xylanase from Bacillus pumilus in Kluyveromyces lactis and its use in deinking of civic paper waste. Efficient expression with a 3-fold increase in the activity than the native organism was achieved. An inducer concentration of 2.5% and medium pH of 9.0 was the best for enzyme expression. Purified enzyme showed an optimum activity at temperatures 50 and 60 degrees C and pH 9.0 and 10.0, respectively. At pH 12.0, enzyme retained 74% and 26% activity after 2 and 3 h of incubation, respectively. After incubation at 50 and 60 degrees C for 1 h, the enzyme showed 100% retention of activity, and remained active for 4 h at 60 degrees C retaining 23% residual activity. Partially purified recombinant enzyme showed higher deinking efficiency (273%) of laser print waste paper than crude xylanase from Bacillus and commercial acidic enzyme. This xylanase with superior stability characteristics could be a suitable candidate in paper and pulp industries. (C) 2014 Elsevier Ltd. All rights reserved.
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