The performance of fungal xylan-degrading enzyme preparations in elemental chlorine-free bleaching for Eucalyptus pulp.
J Ind Microbiol Biotechnol
; 28(4): 204-6, 2002 Apr.
Article
en En
| MEDLINE
| ID: mdl-11986920
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.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Xilosidasas
/
Hongos
/
Lignina
Idioma:
En
Revista:
J Ind Microbiol Biotechnol
Asunto de la revista:
BIOTECNOLOGIA
/
MICROBIOLOGIA
Año:
2002
Tipo del documento:
Article