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Cellulases in Ionic Liquids—The Long Term Stability of Aspergillus sp. Cellulase

Microbiology & Biotechnology, University of Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
Author to whom correspondence should be addressed.
Catalysts 2013, 3(2), 584-587;
Received: 12 April 2013 / Revised: 27 May 2013 / Accepted: 4 June 2013 / Published: 13 June 2013
(This article belongs to the Special Issue Ionic Liquids in Catalysis)
PDF [154 KB, uploaded 13 June 2013]


It is a well known fact that some ionic liquids (ILs) have the potential to dissolve crystalline, water-insoluble cellulose that could be used as a source of glucose and subsequently derived molecules. Nevertheless, in the presence of high IL concentrations, cellulase activity and, even more so, cellulase stability are still challenging difficulties that need to be overcome. Therefore four fungal cellulase preparations were assayed in the presence of 30% (v/v) of five different ILs. Thereby the cellulase from Aspergillus sp. (Sigma-Aldrich) was not only remarkably active (up to 28 U/mg in 30% (v/v) IL ([BMMIM]Cl)), but furthermore stayed active during several weeks in the presence of 60% (v/v) IL (up to 50% relative activity after 9 weeks). View Full-Text
Keywords: ionic liquid; cellulase; Aspergillus ionic liquid; cellulase; Aspergillus

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Ilmberger, N.; Pottkämper, J.; Streit, W.R. Cellulases in Ionic Liquids—The Long Term Stability of Aspergillus sp. Cellulase. Catalysts 2013, 3, 584-587.

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