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Two mannanases from Sclerotium rolfsii in total chlorine free bleaching of softwood kraft pulp

Journal of biotechnology, 1996-10, Vol.50 (2), p.181-188 [Peer Reviewed Journal]

1996 ;1996 INIST-CNRS ;ISSN: 0168-1656 ;EISSN: 1873-4863 ;DOI: 10.1016/0168-1656(96)01563-5 ;CODEN: JBITD4

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  • Title:
    Two mannanases from Sclerotium rolfsii in total chlorine free bleaching of softwood kraft pulp
  • Author: Gübitz, G.M. ; Schnitzhofer, W. ; Balakrishnan, H. ; Steiner, W.
  • Subjects: Biological and medical sciences ; Biotechnology ; Bleaching ; Corticium rolfsii ; Enzyme engineering ; Fundamental and applied biological sciences. Psychology ; Mannanase ; Methods. Procedures. Technologies ; Miscellaneous ; O-glycoside hydrolases ; Pulp ; Sclerotium rolfsii ; wood pulp
  • Is Part Of: Journal of biotechnology, 1996-10, Vol.50 (2), p.181-188
  • Description: The plant pathogenic basidiomycete Sclerotium rolfsii produces a wide range of extracellular hemicellulolytic enzymes. To study the effect of β-mannanases in total chlorine free bleaching of softwood pulp, two purified β -mannanases from S. rolfsii, with molecular masses of 42 and 61 kDa, a xylanase preparation from S. rolfsii and combinations of these were tested in a O(QX)P bleaching sequence (O = oxygen delignification, X = treatment with enzymes, Q = chelation of metals, P = treatment with hydrogen peroxide in alkaline solution). A brightness increase of 1.6 and 1.9% ISO was obtained with the 42 and 61 kDa mannanase and a combination of each of these enzymes with xylanases gave a brightness increase of 2.5 and 2.8% ISO, respectively. The effect of mannanases and xylanases was nearly additive. Both mannanases alone caused a lower decrease of the kappa number as compared to xylanases. The mannanases differed in their ability to release oligosaccharides from different mannans. The 61 kDa mannanase liberated larger fragments and caused rapid depolymerisation of mannans, which seems to promote the bleaching of pulp.
  • Publisher: Lausanne: Elsevier B.V
  • Language: English
  • Identifier: ISSN: 0168-1656
    EISSN: 1873-4863
    DOI: 10.1016/0168-1656(96)01563-5
    CODEN: JBITD4
  • Source: Alma/SFX Local Collection
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