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Xylanase- and laccase-aided hexenuronic acids and lignin removal from specialty sisal fibres
Aracri, Elisabetta; Vidal Lluciá, Teresa
Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera
This work was conceived to investigate for the first time the effectiveness of the combined use of xylanaseand laccase for the removal of hexenuronic acids (HexA) and lignin from sisal pulp fibres. To this end,xylanase (X) and laccase (L) treatments were used in an XLQPo sequence (where Q denotes a chelatingstage and Po an oxygen-reinforced peroxide multi-step treatment) that was applied to pulp in orderto obtain sisal fibres with a high cellulose content. The results of the XLQPo sequence were comparedwith those of an LQPo sequence. The L stage of both sequences was performed in the presence of eitherthe natural compound sinapyl aldehyde (SLD) or the synthetic compound violuric acid (VA), employedas mediators, in order to compare their efficiency in aiding pulp bleaching and HexA removal. Changesin HexA content and the contributions of lignin and HexA to kappa number during each sequence wereexamined. The xylanase treatment was found to remove 47% of lignin, 15% of xylan and 27% of HexA fromthe initial pulp, whereas the laccase–VA system removed 28% of HexA and exhibited higher efficiencythan the laccase–SLD system in reducing kappa number and increasing brightness. In any case, whenthe X treatment was applied, the sequence including laccase–SLD treatment resulted in the strongestdelignification effect. The effluents from each stage of the bleaching sequences were analysed for COD,colour and toxicity, which peaked after the L stage and were significantly higher with SLD than with VA
Àrees temàtiques de la UPC::Enginyeria tèxtil ::Fibres tèxtils
Textile fibers
Textile finishing
Fibres tèxtils -- Acabats
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