English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/63966
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Flax pulp bleaching and residual lignin modification by laccase-mediator systems

AuthorsCamarero, Susana ; García Ballesteros, Olga; Vidal, T.; Colom, José F.; Río Andrade, José Carlos del ; Gutiérrez Suárez, Ana ; Martínez, María Jesús ; Martínez, Ángel T.
Issue Date2002
CitationProgress in Biotechnology 21: 213-222 (2002)
AbstractEnzymatic bleaching of flax alkaline pulp is intended here by using laccase-mediator systems (LMS) based on Pleurotus eryngii, Trametes versicolor and Pycnoporus cinnabarinus laccases and two mediators. The efficiency of the different LMS treatments was compared in terms of brightness, kappa number and viscosity modifications. Furthermore, changes in the molecular structure of residual lignin and lignin/carbohydrate ratio were analyzed by pyrolysis-gas chromatography-mass spectrometry of the treated pulps. Pycnoporus cinnabarinus and T. versicolor laccases in the presence of 1-hydroxybenzotriazole (HBT), were the most effective for flax pulp delignification. Up to 20% ISO brightness increase with respect to the initial pulp and a decrease of kappa number from 9 to 3 were attained after alkaline extraction of the pulps treated with those LMS. Pycnoporus cinnabarinus laccase plus HBT gave also the best selectivity in lignin removal. Analytical pyrolysis of the LMS-treated pulps showed a selective removal of lignin against cellulose and a strong alteration of the residual lignin with preferential removal of the syringyl units. Pycnoporus cinnabrinus LMSHBT gave the best results in terms of decrease of lignin/cellulose and syringyl/guaiacyl ratios, in agreement with data from pulp parameters. For the above reasons laccase from P. cinnabarinus and HBT were selected for further assays including a peroxide step. Up to 89% relative selignification rate (attaining 1.3 kappa number) and an incease of 44% ISO brightness were atained after LMSHBT-peroxide bleaching. Ongoing studies focus on improvement of a LMSHBT-based totally chlorine free sequence for flax pulp bleaching.
URIhttp://hdl.handle.net/10261/63966
DOI10.1016/S0921-0423(02)80023-5
Identifiersdoi: 10.1016/S0921-0423(02)80023-5
issn: 0921-0423
Appears in Collections:(IRNAS) Artículos
(CIB) Artículos
Files in This Item:
File Description SizeFormat 
Flax_pulp_bleaching.pdf2,69 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.