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Applied Biochemistry and Biotechnology

, Volume 142, Issue 2, pp 125–138 | Cite as

Immobilization of Xylanase from Bacillus pumilus Strain MK001 and its Application in Production of Xylo-oligosaccharides

  • Mukesh Kapoor
  • Ramesh Chander KuhadEmail author
Article

Abstract

Xylanase from Bacillus pumilus strain MK001 was immobilized on different matrices following varied immobilization methods. Entrapment using gelatin (GE) (40.0%), physical adsorption on chitin (CH) (35.0%), ionic binding with Q-sepharose (Q-S) (45.0%), and covalent binding with HP-20 beads (42.0%) showed the maximum xylanase immobilization efficiency. The optimum pH of immobilized xylanase shifted up to 1.0 unit (pH 7.0) as compared to free enzyme (pH 6.0). The immobilized xylanase exhibited higher pH stability (up to 28.0%) in the alkaline pH range (7.0–10.0) as compared to free enzyme. Optimum temperature of immobilized xylanase was observed to be 8 °C higher (68.0 °C) than free enzyme (60.0 °C). The free xylanase retained 50.0% activity, whereas xylanase immobilized on HP-20, Q-S, CH, and GE retained 68.0, 64.0, 58.0, and 57.0% residual activity, respectively, after 3 h of incubation at 80.0 °C. The immobilized xylanase registered marginal increase and decrease in K m and V max values, respectively, as compared to free enzyme. The immobilized xylanase retained up to 70.0% of its initial hydrolysis activity after seven enzyme reaction cycles. The immobilized xylanase was found to produce higher levels of high-quality xylo-oligosaccharides from birchwood xylan, indicating its potential in the nutraceutical industry.

Keywords

Bacillus pumilus Immobilization Xylanase Xylo-oligosaccharides 

Notes

Acknowledgment

The authors acknowledge the research grant from Department of Biotechnology, India. M.K is grateful to the Council of Scientific and Industrial Research for a grant of Senior Research Fellowship. The technical assistance provided by Mr. Manwar Singh is duly acknowledged.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Lignocellulose Biotechnology Laboratory, Department of MicrobiologyUniversity of Delhi South CampusNew DelhiIndia

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