Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
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Andréia S. Magaton
,
Jorge Luiz Colodette
Abstract
4-O-methylglucuronoxylans isolated from Eucalyptus grandis and Eucalyptus urophylla kraft black liquors (KBLs) were chemically characterized by Fourier transform infrared spectroscopy (FT-IR), size exclusion chromatography (SEC), and nuclear magnetic resonance (NMR) spectroscopy. Doses of alkali charge, expressed as active alkali (AA), were 16, 17, and 18% while the sulfidity was kept at 25%. Kappa numbers of 19.1, 17.5, and 16.1 for E. grandis and 20.4, 16.8, and 15.4 for E. urophylla were obtained. At higher alkali charges, the recovery of xylans from the KBLs was lower and the degree of substitution of xylans with uronic acids decreased. The average molecular weight (Mw) of the recovered xylans was greater under conditions of mild pulping, i.e., in the case of pulps with higher kappa numbers. Mw of xylans ranged from 16.1 to 19.1 kDa for E. grandis and from 15.4 to 20.4 kDa for E. urophylla. The xylans from KBL may be useful as pulp modifying agents or as a raw material for advanced applications.
©2013 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp
- Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
- Convenient preparation of a β-O-4-type lignin model trimer via KOH-catalyzed hydroxymethylation and a new protection method
- Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)
- Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
- Compressive-torsion DMA of yellow-poplar wood in organic media
- Physiomechanical properties of ultra-lightweight foam core particleboard: different core densities
- Fractal dimension analysis of void size in wood-strand composites based on X-ray computer tomography images
- Sorption isotherms of thermally modified wood
- Hot water extracted wood fiber for production of wood plastic composites (WPCs)
- Generic failure mechanisms in adhesive bonds
- Climate response of cell characteristics in tree rings of Picea crassifolia
- Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
- Short Notes
- Studying thermal conductivity of wood at cell wall level by scanning thermal microscopy (SThM)
- Beech wood shrinkage observed at the micro-scale by a time series of X-ray computed tomographs (μXCT)
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp
- Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
- Convenient preparation of a β-O-4-type lignin model trimer via KOH-catalyzed hydroxymethylation and a new protection method
- Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)
- Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
- Compressive-torsion DMA of yellow-poplar wood in organic media
- Physiomechanical properties of ultra-lightweight foam core particleboard: different core densities
- Fractal dimension analysis of void size in wood-strand composites based on X-ray computer tomography images
- Sorption isotherms of thermally modified wood
- Hot water extracted wood fiber for production of wood plastic composites (WPCs)
- Generic failure mechanisms in adhesive bonds
- Climate response of cell characteristics in tree rings of Picea crassifolia
- Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
- Short Notes
- Studying thermal conductivity of wood at cell wall level by scanning thermal microscopy (SThM)
- Beech wood shrinkage observed at the micro-scale by a time series of X-ray computed tomographs (μXCT)
- Meetings
- Meetings
