Optimization of a Laccase-Mediator Stage for TCF Bleaching of Flax Pulp
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O. García
Summary
Flax pulp obtained by anthraquinone-soda pulping, resulting in a kappa number of 11.1, a viscosity of 950 ml/g and 36.7% ISO brightness, was bleached in a totally chlorine-free sequence using the enzyme laccase from the fungus Pycnoporus cinnabarinus and 1-hydroxybenzotriazole (HBT) as redox mediator (stage L), followed by a hydrogen peroxide stage (P). The laccase treatment was optimized using a three-variable sequential statistical plan over the following ranges: 1–20 U/g o.d.p. (oven-dried pulp) laccase dose, 0.5–7.5% o.d.p. HBT dose and 1–24 h reaction time. The influence of these variables on several pulp properties after the P stage of the LP sequence was examined. The models defined from the results obtained predicted variations in ISO brightness, viscosity and kappa number of 57.6–74.8%,590–955 ml/g and 0–6.2, respectively. The variables most strongly influencing these pulp properties were found to be the reaction time and the enzyme dose. A compromise was adopted as regards the operating conditions in order to ensure optimum results. The study was completed by conducting a biobleaching assay in a pressurized reactor (590 kPa) to assess the effect of oxygen pressure. The high pressure level resulted in improved pulp properties by the laccase-mediator system.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Natural Decay Resistance of Juvenile Teak Wood Grown in High Input Plantations
- The Need for Unequivocally Defined Reference Fungi-Genomic Variation in Two Strains Named as Coniophora puteana BAM Ebw. 15
- The Oriented Structure of Lignin and its Viscoelastic Properties Studied by Static and Dynamic FT-IR Spectroscopy
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- Synthesis of Coniferins 13C-Enriched at Position 4 or 5 of the Guaiacyl Ring
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- Optimization of a Laccase-Mediator Stage for TCF Bleaching of Flax Pulp
- Analysis of Pinus radiata D. Don Bark by Near Infrared Spectroscopy
- Analysis of Black Wattle (Acacia mearnsii De Wild) Bark by Near Infrared Spectroscopy
- Computer Aided Identification of the Moisture Transport Parameters in Spruce Wood
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- The Adjusted Dynamic Modulus of Elasticity Above the Fiber Saturation Point in Taiwania Plantation Wood by Ultrasonic-Wave Measurement
- Effects of Clonal Selection by Microfibril Angle on the Genetic Improvement of Stiffness in Cryptomeria japonica D. Don
- Observation of Development of Microcracks on Wood Surface Caused by Drying Stresses
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