Applied Biochemistry and Biotechnology

, Volume 19, Issue 2, pp 189–207

Immobilization of cellulase using polyurethane foam

  • Ajoy C. Chakrabarti
  • Kenneth B. Storey

DOI: 10.1007/BF02921483

Cite this article as:
Chakrabarti, A.C. & Storey, K.B. Appl Biochem Biotechnol (1988) 19: 189. doi:10.1007/BF02921483


Cellulase was covalently immobilized using a hydrophilic polyurethane foam (Hypol®FHP 2002). Compared to the free enzyme, immobilized cellulase showed a dramatic decrease (7.5-fold) in the Michaelis constant for carboxymethylcellulose. The immobilized enzyme also had a broader and more basic pH optimum (pH 5.5–6.0), a greater stability under heat-denaturing or liquid nitrogen-freezing conditions, and was relatively more efficient in utilizing insoluble cellulose substrates. High molecular weight compounds (Blue Dextran) could move throughout the foam matrix, indicating permeability to insoluble celluloses; activity could be further improved 2.4-fold after powdering, foams under liquid nitrogen. The improved kinetic and stability features of the immobilized cellulase combined with advantageous properties of the polyurethane foam (resistance to enzymatic degradation, plasticity of shape and size) suggest that this mechanism of cellulase immobilization has high potential for application in the industrial degradation of celluloses.

Index Entries

Cellulase enzyme immobilization polyurethane foam cellulose degradation 

Copyright information

© Humana Press Inc. 1988

Authors and Affiliations

  • Ajoy C. Chakrabarti
    • 1
  • Kenneth B. Storey
    • 1
  1. 1.Institute of Biochemistry and Department of BiologyCarleton UniversityOttawaCanada

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