Effect of Bacillus circulans D1 Thermostable Xylanase on Biobleaching of Eucalyptus Kraft Pulp

  • Daniela A. Bocchini
  • Valquiria B. Damiano
  • Eleni Gomes
  • Roberto Da Silva
Part of the Applied Biochemistry and Biotechnology book series (ABAB)

Abstract

The alkalophilic Bacillus circulans Dl was isolated from decayed wood. It produced high levels of extracellular cellulase-free xylanase. The enzyme was thermally stable up to 60°C, with an optimal hydrolysis temperature of 70°C. It was stable over a wide pH range (5.5–10.5), with an optimum pH at 5.5 and 80% of its activity at pH 9.0. This cellulase-free xylanase preparation was used to biobleach kraft pulp. Enzymatic treatment of kraft pulp decreased chlorine dioxide use by 23 and 37% to obtain the same kappa number (κ number) and brightness, respectively. Separation on Sephadex G-50 isolated three fractions with xylanase activity with distinct molecular weights.

Index Entries

Bacillus circulans biobleaching kraft pulp thermophilic xylanase 

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Copyright information

© Springer Science+Business Media New York 2003

Authors and Affiliations

  • Daniela A. Bocchini
    • 1
  • Valquiria B. Damiano
    • 1
  • Eleni Gomes
    • 1
  • Roberto Da Silva
    • 1
  1. 1.Departmento de Quimica de Geociencias, Laboratório de Bioquímica dos Processos e Microbiologia AplicadaIBILCE-UNESPSão José do Rio PretoBrazil

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