Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL)
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Anderson Guerra
Abstract
Despite the growing importance of Eucalyptus wood as raw material for pulp and paper, there is a lack of knowledge on the chemistry of their macromolecular components. The present paper addresses this issue by applying the recently developed protocol for isolating enzymatic mild acidolysis lignins (EMAL) from Eucalyptus grandis, Eucalyptus globulus and the softwood species Douglas fir and white fir, which were used for comparative purposes. The structures of EMALs were investigated by quantitative 31P NMR, DFRC/31P NMR (derivatization followed by reductive cleavage followed by quantitative 31P NMR) and size exclusion chromatography (SEC). Overall, the yields of EMALs isolated from Eucalyptus were higher than those from the softwoods examined. Lignin from E. globulus was found to contain higher contents of arylglycerol-β-aryl ether structures, free phenolic hydroxyl groups and syringyl-type units than lignin from E. grandis. New insights provided by the DFRC/31P NMR revealed that up to 62.2% of arylglycerol-β-aryl ether structures in E. globulus are uncondensed, while in E. grandis the amount of such uncondensed structures was found to be lower than 48%. SEC analyses showed that lignins from E. grandis and softwoods associate in greater extension than lignin from E. globulus.
©2008 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Meetings
- Evaluation of Eucalyptus grandis Hill ex Maiden biopulping with Ceriporiopsis subvermispora under non-aseptic conditions
- Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate
- A new and facile method for isolation of lignin from wood based on complete wood dissolution
- Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL)
- Fractionation and characterization of xylan rich extracts from birch
- Polyoxometalate (POM) oxidation of lignin model compounds
- Pyrolytic cleavage mechanisms of lignin-ether linkages: A study on p-substituted dimers and trimers
- Polysaccharide degradation in waterlogged oak wood from the ancient warship Vasa
- Degradation of polyethylene glycol and hemicellulose in the Vasa
- Selection criteria of Eucalyptus globulus Labill. for production of chemithermomechanical pulps (CTMP)
- The effect of (induced) dislocations on the tensile properties of individual Norway spruce fibres
- Mode I and Mode II fracture toughness of densified Sitka spruce fabricated in an airtight atmosphere with high-temperature steam
- Characteristic properties of embedding strength for the nailing of the gonfolo rose (Qualea rosea Aubl.)
- Adhesive penetration of wood cell walls investigated by scanning thermal microscopy (SThM)
- Laboratory screening of tropical hardwoods for natural resistance to the marine borer Limnoria quadripunctata: The role of leachable and non-leachable factors
- Decay resistance of wood treated with amino-silicone compounds
- Hydrothermal treatment of mixed preservative-treated wood waste
- Variation of tracheid length within annual rings of Scots pine and Norway spruce
Articles in the same Issue
- Meetings
- Evaluation of Eucalyptus grandis Hill ex Maiden biopulping with Ceriporiopsis subvermispora under non-aseptic conditions
- Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate
- A new and facile method for isolation of lignin from wood based on complete wood dissolution
- Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL)
- Fractionation and characterization of xylan rich extracts from birch
- Polyoxometalate (POM) oxidation of lignin model compounds
- Pyrolytic cleavage mechanisms of lignin-ether linkages: A study on p-substituted dimers and trimers
- Polysaccharide degradation in waterlogged oak wood from the ancient warship Vasa
- Degradation of polyethylene glycol and hemicellulose in the Vasa
- Selection criteria of Eucalyptus globulus Labill. for production of chemithermomechanical pulps (CTMP)
- The effect of (induced) dislocations on the tensile properties of individual Norway spruce fibres
- Mode I and Mode II fracture toughness of densified Sitka spruce fabricated in an airtight atmosphere with high-temperature steam
- Characteristic properties of embedding strength for the nailing of the gonfolo rose (Qualea rosea Aubl.)
- Adhesive penetration of wood cell walls investigated by scanning thermal microscopy (SThM)
- Laboratory screening of tropical hardwoods for natural resistance to the marine borer Limnoria quadripunctata: The role of leachable and non-leachable factors
- Decay resistance of wood treated with amino-silicone compounds
- Hydrothermal treatment of mixed preservative-treated wood waste
- Variation of tracheid length within annual rings of Scots pine and Norway spruce
