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Bioresour Technol. 2011 Jun;102(11):6554-61. doi: 10.1016/j.biortech.2011.03.068. Epub 2011 Mar 27.

Use of thermogravimetric analysis to monitor the effects of natural laccase mediators on flax pulp.

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  • 1Department of Textile and Paper Engineering, Universitat Polit√®cnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.

Abstract

The effects of 1-hydroxybenzotriazole (HBT) and the natural laccase mediators gallic acid, caffeic acid and p-hydroxybenzoic acid, on the enzymatic bleaching of flax pulp were compared. The treatment was performed under atmospheric air and oxygen pressure, and, for the first time, monitored by thermogravimetric analysis (TGA) for comparison with chemical analysis, FTIR and X-ray diffraction (XRD) spectroscopies. Thermogravimetric data were simulated by applying a nucleation kinetic equation to a combustion model based on four pseudo-components (hemicellulose, amorphous and crystalline cellulose, and lignin). The results thus obtained show that the effects of the natural mediators are similar to those of HBT and lead to increased order in cellulose microfibril surfaces. An increase in pulp crystallinity was additionally exposed by the XRD and FTIR techniques, and a reduction in microfibril equatorial size by the XRD patterns. Simulated DTG curves were used to determine the kinetic parameters for thermal degradation.

Copyright © 2011 Elsevier Ltd. All rights reserved.

PMID:
21498071
[PubMed - indexed for MEDLINE]
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