title: Effects of laccase-natural mediator systems on kenaf pulp.
abstract: This paper reports the first application of laccase-mediator systems (LMS) to kenaf pulp. Five natural phenolic compounds (acetosyringone, syringaldehyde, p-coumaric acid, vanillin and acetovanillone) were used as mediators in combination with laccase in an L stage in order to elucidate their effect on delignification. After LMS treatment, pulp samples were subjected to two alkaline treatments (an E or P stage). The results obtained were compared with those provided by the laccase-1-hydroxybenzotriazole (HBT) system. All natural mediators increased kappa number, decreased brightness and changed optical properties of the pulp after the L stage, suggesting that natural mediators tend to couple to fibers during a laccase-mediator treatment. The greatest delignification and bleaching effects after the P stage were obtained with syringaldehyde and acetosyringone, providing an effective means for delignifying kenaf, whereas those based on the other three could be used to functionalize kenaf with a view to obtaining pulp with novel properties.
authors: Chemical Engineering Department, ETSEIAT, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
authors: Glòria
authors: G
authors: Andreu
authors: Teresa
authors: T
authors: Vidal
mesh_terms: D031584:Hibiscus; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D042845:Laccase / Q000737:chemistry*; D013783:Textile Industry
chemical_list: D007220:Industrial Waste; D006861:Hydrogen Peroxide; D042845:Laccase