Assessing the use of xylanase and laccases in biobleaching stages of a TCF sequence for flax pulp

Abstract

Postprint (published version

Effectiveness of novel xylanases belonging to different GH families on lignin and hexenuronic acids removal from specialty sisal fibres

“…Xyn30, Xyn30cat and Xyn11E presented similar results on eucalyptus as they did on sisal fibres, suggesting a similar behaviour in bleaching. Xylanase treatment of flax fibres released only small amounts of sugar in each case, which can probably be attributed to the low xylan content of these fibres, in accordance with its high cellulose content . Kenaf fibres, in contrast, recorded slightly better results than those obtained with sisal, indicating that an enzyme‐aided bleaching with Xyn10A or Pba crude xylanase could produce promising results.…”

“…Xylanase treatment of flax fibres released only small amounts of sugar in each case, which can probably be attributed to the low xylan content of these fibres, in accordance with its high cellulose content. 34 Kenaf fibres, in contrast, recorded slightly better results than those obtained with sisal, indicating that an enzyme-aided bleaching with Xyn10A or Pba crude xylanase could produce promising results. We believe this result is remarkable since to the best of our knowledge no xylanases have previously been tested in the bleaching of kenaf fibres.…”

Enzymatic strategies to improve removal of hexenuronic acids and lignin from cellulosic fibers

“…The effectiveness of this approach was demonstrated on various types of pulp (Fillat et al 2010b;Andreu and Vidal 2011). In fact, HexA removal from eucalyptus and flax pulp by the systems L HBT and L VA was confirmed (Oudia et al 2008;Cadena et al 2010;Valls et al 2010c;Fillat et al 2011), but the effects of lignin-type mediators on HexA have scarcely been assessed (Eugenio et al 2010;Aracri and Vidal 2011;Fillat et al 2011). …”

Manganese peroxidase and biomimetic systems applied toin vitrolignin degradation inEucalyptus grandismilled wood and kraft pulps

“…White‐rot fungi are the only organisms able to efficiently degrade lignin either in nature or under controlled in vitro conditions . Biopulping and biobleaching technologies are based on the functions of these fungi or of the functions of the oxidoreductases and hydrolases they produce . White‐rot fungi had also been evaluated for degrading lignin in biological pretreatment processes to facilitate the enzymatic digestion of polysaccharides in the context of lignocellulosic biofuels .…”

“…In vitro lignin degradation by pure or mixed enzymes is less efficient compared to living organisms acting on wood in both nature and in laboratory‐controlled conditions . However, significant advances in lignin degradation have been reported for pulp bleaching processes using laccase/mediator systems and MnP . Among the systems evaluated, MnP degraded lignin or lignin model compounds mediated by the in vitro peroxidation of unsaturated fatty acids or lignocellulose fragments .…”