On hexenuronic acid (HexA) removal and mediator coupling to pulp fiber in the laccase/mediator treatment
2011 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 102, no 4, 3911-3917 p.Article in journal (Refereed) Published
Flax soda/AQ pulps were treated with different fungal laccase-mediator combinations followed by physical and chemical characterization of the pulps to obtain a thorough understanding of the laccase/mediator effects on hexenuronic acid (HexA) removal and the coupling of mediator onto pulps for fiber functionalization. Large differences were found and the presence of lauryl gallate (LG) during Trametes villosa laccase (TvL) treatment (TvL + LG) resulted in a much larger reduction of pulp-linked HexA than the combination of p-coumaric acid (PCA) and Pycnoporus cinnabarinus laccase (PcL). A major portion of LG became attached to the pulp as revealed by an increase in the kappa number and further confirmed by thioacidolysis and H-1 NMR analysis of solubilized pulp fractions. Additional experiments with other chemical pulps and isolated pulp xylan and lignin revealed that HexA seems to be the sole pulp component attacked by TvL + LG. As a substrate for TvL, the reaction preference order is PCA > HexA > LG.
Place, publisher, year, edition, pages
2011. Vol. 102, no 4, 3911-3917 p.
Biobleaching, Coupling, Flax, Functionalization, Hexenuronic acid
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-31363DOI: 10.1016/j.biortech.2010.11.127ISI: 000287277800036ScopusID: 2-s2.0-78651488677OAI: oai:DiVA.org:kth-31363DiVA: diva2:404289
QC 201103162011-03-162011-03-142013-08-20Bibliographically approved