The performance of fungal xylan-degrading enzyme preparations in elemental chlorine-free bleaching for Eucalyptus pulp |
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Authors: | RG Medeiros FG Silva Jr BC Salles RS Estelles EXF Filho |
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Institution: | Laboratório de Enzimologia, Departamento de Biologia Celular, Universidade de Brasília, Brasília, DF, Brazil CEP 70910-900. |
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Abstract: | Cellulase-free xylan-degrading enzyme preparations from Acrophialophora nainiana, Humicola grisea var. thermoidea and two Trichoderma harzianum strains were used as bleaching agents for Eucalyptus kraft pulp, prior to a chlorine dioxide and alkaline bleaching sequence. In comparison to the control sequence (performed
without xylanase pretreatment), the sequence incorporating enzyme treatment was more effective. Removal of residual lignin
was indicated by a reduction in kappa number. Overall, enzyme preparations from T. harzianum were marginally more effective in reducing pulp viscosity and chlorine chemical consumption and improving the brightness
of the kraft pulp. However, the highest reduction in pulp viscosity was mediated by the xylanase preparation from A. nainiana. Xylanase pretreatment compares very favorably with that of chemical pulping. Journal of Industrial Microbiology & Biotechnology (2002) 28, 204–206 DOI: 10.1038/sj/jim/7000227
Received 27 April 2001/ Accepted in revised form 03 November 2001 |
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Keywords: | : Eucalyptus xylanase biobleaching Acrophialophora nainiana |
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