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Wood Science and Technology

Erschienen in:

01.08.2011 | Original

Performance of new and commercial xylanases for ECF and TCF bleaching of eucalyptus kraft pulp

verfasst von: Cristina Valls, Óscar Gallardo, Teresa Vidal, F. I. Javier Pastor, Pilar Díaz, M. Blanca Roncero

Erschienen in: Wood Science and Technology | Ausgabe 3/2011

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Abstract

Since xylanases can differ widely in their bleaching efficiency, the performance of one new and two commercial xylanases was evaluated in an eucalyptus kraft pulp following XD (X: xylanase; D: chlorine dioxide) and XP (P: hydrogen peroxide) sequences. The new xylanase did not show a significant bleach boosting effect but increased the hexenuronic acid (HexA) removal by 10% after the D stage. The two commercial xylanases behaved in a different way, being one of them (X_C) the most effective in increasing delignification (9%) and brightness (3%ISO). Its effectiveness was related to its greater action on releasing the xylan polymer, thus producing also a strong decrease in the HexA contents during the enzymatic stage (15%). All xylanases produced morphological changes in the fibre surfaces, but only with X_C cracks and holes that improved the diffusion of reactives were observed. Finally, the best bleaching results were obtained with the XD sequence and therefore, a complete bleaching sequence XDEopD₁ (Eop: alkaline extraction with oxygen and peroxide) was carried out with the best enzyme.

Vorheriger Artikel Structural characterization of lignin from wheat straw

Nächster Artikel Effect of the addition of Acacia mangium bark on thermosetting of phenol–formaldehyde resin

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Titel: Performance of new and commercial xylanases for ECF and TCF bleaching of eucalyptus kraft pulp
verfasst von: Cristina Valls
Óscar Gallardo
Teresa Vidal
F. I. Javier Pastor
Pilar Díaz
M. Blanca Roncero
Publikationsdatum: 01.08.2011
Verlag: Springer-Verlag
Erschienen in: Wood Science and Technology / Ausgabe 3/2011
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-010-0340-8

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