Xylanase production by fungal strains on spent sulphite liquor

Zawadi A. Chipeta, James C. Du Preez, G. Szakács, Lew Christopher

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Xylanase production by seven fungal strains was investigated using concentrated spent sulphite liquor (SSLc), xylan and d-xylose as carbon substrates. An SSLc-based medium induced xylanase production at varying levels in all of these strains, with Aspergillus oryzae NRRL 3485 and Aspergillus phoenicis ATCC 13157 yielding activities of 164 and 146 U ml-1, respectively; these values were higher than those obtained on xylan or d-xylose with the same fungal strains. The highest xylanase activity of 322 U ml -1 was obtained with Aspergillus foetidus ATCC 14916 on xylan. Electrophoretic and zymogram analysis indicated three xylanases from A. oryzae with molecular weights of approximately 32, 22 and 19 kDa, whereas A. phoenicis produced two xylanases with molecular weights of about 25 and 21 kDa. Crude xylanase preparations from these A. oryzae and A. phoenicis strains exhibited optimal activities at pH 6.5 and 5.0 and at 65 and 55°C, respectively. The A. oryzae xylanolytic activity was stable at 50°C over the pH range 4.5-10. The crude xylanase preparations from these A. oryzae and A. phoenicis strains had negligible cellulase activity, and their application in the biobleaching of hardwood pulp reduced chlorine dioxide consumption by 20-30% without sacrificing brightness.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalApplied Microbiology and Biotechnology
Volume69
Issue number1
DOIs
Publication statusPublished - Nov 2005

Fingerprint

Aspergillus oryzae
Sulfites
Xylans
Aspergillus
Xylose
Molecular Weight
Endo-1,4-beta Xylanases
Molecular weight
Cellulase
Hardwoods
Carbon
Chlorine
Pulp
Luminance
Substrates

ASJC Scopus subject areas

  • Biotechnology
  • Microbiology
  • Bioengineering
  • Microbiology (medical)

Cite this

Xylanase production by fungal strains on spent sulphite liquor. / Chipeta, Zawadi A.; Du Preez, James C.; Szakács, G.; Christopher, Lew.

In: Applied Microbiology and Biotechnology, Vol. 69, No. 1, 11.2005, p. 71-78.

Research output: Contribution to journalArticle

Chipeta, Zawadi A. ; Du Preez, James C. ; Szakács, G. ; Christopher, Lew. / Xylanase production by fungal strains on spent sulphite liquor. In: Applied Microbiology and Biotechnology. 2005 ; Vol. 69, No. 1. pp. 71-78.
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