Effect of Bacillus circulans D1 thermostable xylanase on biobleaching of eucalyptus kraft pulp

Nenhuma Miniatura disponível

Data

2003-03-01

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Tipo

Trabalho apresentado em evento

Direito de acesso

Acesso abertoAcesso Aberto

Resumo

The alkalophilic Bacillus circulans D1 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.

Descrição

Idioma

Inglês

Como citar

Applied Biochemistry and Biotechnology - Part A Enzyme Engineering and Biotechnology, v. 106, n. 1-3, p. 393-402, 2003.

Itens relacionados

Financiadores