Application of crude xylanase from Bacillus licheniformis 77-2 to the bleaching of eucalyptus Kraft pulp |
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Authors: | Damiano V.B. Bocchini D.A. Gomes E. Da Silva R. |
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Affiliation: | (1) Laboratório de Bioquímica e Microbiologia Aplicada, IBILCE, UNESP, R. Cristovao Colombo, n. 2265, S.J, Rio Preto – SP, CEP 15054-000, Brazil |
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Abstract: | Alkalophilic Bacillus licheniformis 77-2 produced an extracellular alkali-tolerant xylanase with negligible cellulase activity in medium containing corn straw. The effectiveness of crude xylanase on treatment of eucalyptus Kraft pulp was evaluated. A biobleaching experiment was carried out to compare the chlorine saving with pulp treated and untreated by the enzyme. Two-stage bleaching was employed, using a ClO2 chlorination and NaOH extraction (DE sequence). With the enzymatic treatment, in order to obtain the same value of Kappa number and brightness, respectively 28.5 and 30% less ClO2 was required in comparison to the enzymatically untreated samples. |
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Keywords: | Bacillus licheniformis biobleaching Kraft pulp xylanase |
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