Evaluating laccase-facilitated coupling of phenolic acids to high-yield kraft pulps

In an effort to alter the physical properties of high-yield kraft, fibers were treated at high consistency (20%) with laccase and syringic, vanillic, or 4-hydroxybenzoic acid. Treatment with laccase and 4-hydroxybenzoic acid resulted in a 20-point increase in kappa number and a 100% increase in bulk...

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Bibliographic Details
Published in:Enzyme and microbial technology 2002-06, Vol.30 (7), p.855-861
Main Authors: Chandra, Richard P., Ragauskas, Arthur J.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biotechnology
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Other applications
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Summary:In an effort to alter the physical properties of high-yield kraft, fibers were treated at high consistency (20%) with laccase and syringic, vanillic, or 4-hydroxybenzoic acid. Treatment with laccase and 4-hydroxybenzoic acid resulted in a 20-point increase in kappa number and a 100% increase in bulk acid groups. ESCA analysis of the treated and untreated pulp revealed that the laccase-grafted fibers had a two-fold enrichment in acid groups, strongly suggesting a laccase-facilitated coupling of 4-hydroxybenzoic acid to the fiber surface. A model system consisting of lignin-coated cellulosic fibers was developed to determine changes to the lignin structure during laccase grafting. 31P NMR analysis of lignin from the model system revealed an increase in acid groups with a concomitant decrease in phenolic hydroxyl groups.
ISSN:0141-0229
1879-0909
DOI:10.1016/S0141-0229(02)00020-0