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Enzyme Research
Volume 2011 (2011), Article ID 379176, 8 pages
http://dx.doi.org/10.4061/2011/379176
Research Article

Improved Laccase Production by Trametes pubescens MB89 in Distillery Wastewaters

1Product Recovery, LanzaTech, 24 Balfour Road, Auckland 1052, New Zealand
2Department of Biochemistry, Microbiology and Biotechnology, Rhodes University, P. O. Box 94, Grahamstown 6140, South Africa

Received 17 April 2011; Revised 25 July 2011; Accepted 9 August 2011

Academic Editor: Alane Beatriz Vermelho

Copyright © 2011 P. J. Strong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Various culture parameters were optimised for laccase synthesis by Trametes pubescens MB89, including pH, carbon source, nitrogen source, lignocellulosic supplements, and reported inducers. Glucose, in conjunction with a complex nitrogen source at pH 5.0, resulted in the highest laccase yield. Adding ethanol, copper, or 2,5-xylidine prior to inoculation further improved laccase concentrations. The addition of 2,5-xylidine was further investigated with multiple additions applied at varying times. This novel application substantially improved laccase production when applied regularly from inoculation and during the growth phase, and also countered glucose repression of laccase synthesis. Single and multiple factor changes were studied in three distillery wastewaters and a wine lees. A synergistic increase in laccase synthesis was observed with the addition of glucose, copper, and 2,5-xylidine. Single addition of 2,5-xylidine proved most beneficial with distillery wastewaters, while copper addition was most beneficial when using the wine lees as a culture medium.