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Application of xylanases from Amazon Forest fungal species in bleaching of eucalyptus kraft pulps BABT
Medeiros,Roseli Garcia; Silva Jr.,Francides Gomes da; Báo,Sônia Nair; Hanada,Rogério; Ferreira Filho,Edivaldo Ximenes.
Crude xylanase preparations from Penicillium corylophilum, Aspergillus niger and Trichoderma longibrachiatum were used to treat Eucalyptus kraft pulp, prior to chlorine dioxide and alkaline bleaching sequences. The enzyme pretreatment improved brightness and delignification of non-delignified and oxygen-bleached samples of eucalyptus kraft pulp. Xylanase preparations from T. longibrachiatum and P. corylophilum were more effective to reduce pulp kappa number. A small reduction in viscosity was obtained when the oxygen-bleached pulp was treated with xylanase preparation from A. niger. For all enzyme samples, the best release of chromophoric material from the pulp was at 237 nm. The enzyme preparation from P. corylophilum was responsible for the highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Xylan; Xylanase; Kraft pulp; Pulp bleaching.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200008
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