Pyrolysis-GC/MS and TG/MS study of mediated laccase biodelignification of Eucalyptus globulus kraft pulp

Atika Oudia, Erika Mészáros, Rogério Simões, João Queiroz, Emma Jakab

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Biobleaching studies using laccase mediator system (LMS) were carried out, under optimized conditions, on two unbleached Eucalyptus globulus kraft pulps, one produced by conventional way, with kappa number of 16.1, and another with kappa number of 14.5, obtained by modified kraft procedure with a high liquor/wood ratio and with black liquor replacement in the middle of the cooking. The pulp properties before and after LMS and alkaline extraction were evaluated in terms of kappa number, hexeneuronic acid content, viscosity, brightness and acid insoluble lignin content. The original milled wood sample and the kraft pulps were characterized by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry/mass spectrometry (TG/MS). Eucalypt wood lignin produces guaiacol and syringol derivatives during pyrolysis. These lignin products can be detected with high sensitivity using the selected ion chromatograms even in the bleached pulp of low lignin content (about 0.5%). Py-GC/MS revealed that the lignin moieties were similarly altered during biobleaching as during pulping, which is exemplified by the preferential removal of aldehyde groups from the alkyl side groups. Semi-quantitative analysis of the pyrograms indicates that the lignin content of the biobleached pulps is reduced by about half in comparison with the unbleached pulps. The TG/MS results show that the hemicellulose content of wood was strongly modified during pulping resulting in higher thermal stability.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalJournal of Analytical and Applied Pyrolysis
Volume78
Issue number2
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Laccase
lignin
Kraft pulp
Lignin
thermogravimetry
pyrolysis
Mass spectrometry
Thermogravimetric analysis
Pyrolysis
mass spectroscopy
Wood
gas chromatography
Gas chromatography
Pulp
Pulp cooking
Unbleached pulp
Guaiacol
Bleached pulp
acids
Acids

Keywords

  • Carbohydrate
  • Eucalyptus globulus
  • Gas chromatography
  • Kraft pulp
  • Laccase
  • Lignin
  • Pyrolysis
  • Thermogravimetry/mass spectrometry
  • Violuric acid

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

Cite this

Pyrolysis-GC/MS and TG/MS study of mediated laccase biodelignification of Eucalyptus globulus kraft pulp. / Oudia, Atika; Mészáros, Erika; Simões, Rogério; Queiroz, João; Jakab, Emma.

In: Journal of Analytical and Applied Pyrolysis, Vol. 78, No. 2, 03.2007, p. 233-242.

Research output: Contribution to journalArticle

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