Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5610
Título: Effect of xylanases on peroxide bleachability of eucalypt (E.globulus) kraft pulp
Autor: Shatalov, Anatoly
Pereira, Helena
Palavras-chave: xylanase bleaching
eucalypt kraft pulp
enzyme biocatalysis
enzyme technology
Data: 2008
Editora: Elsevier
Citação: "Biochemical Engineering Journal". ISSN 1369-703X. 40 (2008) 19-26
Resumo: Industrial eucalypt (E. globulus L.) kraft pulp was treated with two commercial xylanase preparations Ecopulp® TX-200A and Pulpzyme® HC (endo-1,4- -xylanase activity; EC and bleached by totally chlorine-free (TCF) three-stage hydrogen peroxide bleaching sequence, without oxygen pre-delignification. The effect of enzymatic stage on pulp properties and bleachability has been studied and compared with reference (control) pulps, processed without enzyme addition. The similar mode of enzymatic action was noted for both xylanase preparations. Final brightness of 86% ISO was achieved after complete bleaching. Direct bleaching effect caused pulp brightening (by 1.2–1.5% ISO) and delignification (by 7–10%) immediately after the enzymatic stage. The maximal bleach boosting was shown after the first peroxide stage and then diminished, despite the progressive increase in delignification over the control. The loss in efficiency of xylanase treatment by the end of peroxide bleaching was associated with specific behavior of xylan-derived chromophores, i.e., hexenuronic acids
Peer review: yes
URI: http://hdl.handle.net/10400.5/5610
ISSN: 1369-703X
Versão do Editor: www.elsevier.com/locate/bej
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