Lipid and lignin composition of woods from different eucalypt species
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Jorge Rencoret
Abstract
The lipid and lignin compositions of woods from the eucalypt species Eucalyptus globulus, E. nitens, E. maidenii, E. grandis, and E. dunnii have been characterized. The lipid composition was analyzed by GC and GC/MS using short- and medium-length high-temperature capillary columns, which allowed the detection of intact high-molecular-weight compounds. Similar lipid compositions were observed in all eucalypt woods, which were dominated by sitosterol, sitosterol esters and sitosteryl 3β-D-glucopyranoside. These substance classes are mainly responsible for pitch deposition during kraft pulping of eucalypt wood. However, some quantitative differences were found in the abundance of different lipid classes, with wood from E. globulus containing the lowest amounts of these pitch-forming compounds. The lignins of all eucalypt woods were analyzed in situ (without previous isolation) by pyrolysis-GC/MS. A predominance of syringyl (S) over guaiacyl (G) lignin units was observed and the S/G ratio was in the range from 2.7 to 4.1. E. globulus wood had the highest S/G ratio, a finding that, together with its low lignin content, explains its easy delignification under kraft cooking conditions.
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Articles in the same Issue
- Characterization of thin water layers in pulp by tritium exchange. Part 1: Methods development
- Characterization of thin water layers in pulp by tritium exchange. Part 2: Effect of refining on water absorption
- Characterizing wood fiber and particle length with a mixture distribution and a segmented distribution
- Effect of photolysis on 17th/18th century paper
- Changes in the cell wall volume of a number of wood species due to reaction with acetic anhydride
- A novel simple route to wood acetylation by transesterification with vinyl acetate
- Formation and properties of nanocomposites made up from solid aspen wood, melamine-urea-formaldehyde, and clay
- Ellagitannins from Portuguese oak wood (Quercus pyrenaica Willd.) used in cooperage: influence of geographical origin, coarseness of the grain and toasting level
- Epimeric phenylpropanoid glycosides from inner bark of Paulownia coreana Uyeki
- Lipid and lignin composition of woods from different eucalypt species
- A hysteresis model suitable for numerical simulation of moisture content in wood
- Simple estimation of critical stress intensity factors of wood by tests with double cantilever beam and three-point end-notched flexure
- Screening fungi tolerant to Western red cedar (Thuja plicata Donn) extractives. Part 1. Mild extraction by ultrasonication and quantification of extractives by reverse-phase HPLC
- Screening fungi tolerant to Western red cedar (Thuja plicata Donn) extractives. Part 2. Development of a feeder strip assay
- Contribution of hardness to the natural resistance of a range of wood species to attack by the marine borer Limnoria
- Biodeterioration of treated Pinus radiata timber by Australian decay fungi and the termite Coptotermes acinaciformis in laboratory bioassays and field conditions
- Development of an accelerated soil-contact decay test
- Obituary Dr. Bo Hortling (1942–2006)
Articles in the same Issue
- Characterization of thin water layers in pulp by tritium exchange. Part 1: Methods development
- Characterization of thin water layers in pulp by tritium exchange. Part 2: Effect of refining on water absorption
- Characterizing wood fiber and particle length with a mixture distribution and a segmented distribution
- Effect of photolysis on 17th/18th century paper
- Changes in the cell wall volume of a number of wood species due to reaction with acetic anhydride
- A novel simple route to wood acetylation by transesterification with vinyl acetate
- Formation and properties of nanocomposites made up from solid aspen wood, melamine-urea-formaldehyde, and clay
- Ellagitannins from Portuguese oak wood (Quercus pyrenaica Willd.) used in cooperage: influence of geographical origin, coarseness of the grain and toasting level
- Epimeric phenylpropanoid glycosides from inner bark of Paulownia coreana Uyeki
- Lipid and lignin composition of woods from different eucalypt species
- A hysteresis model suitable for numerical simulation of moisture content in wood
- Simple estimation of critical stress intensity factors of wood by tests with double cantilever beam and three-point end-notched flexure
- Screening fungi tolerant to Western red cedar (Thuja plicata Donn) extractives. Part 1. Mild extraction by ultrasonication and quantification of extractives by reverse-phase HPLC
- Screening fungi tolerant to Western red cedar (Thuja plicata Donn) extractives. Part 2. Development of a feeder strip assay
- Contribution of hardness to the natural resistance of a range of wood species to attack by the marine borer Limnoria
- Biodeterioration of treated Pinus radiata timber by Australian decay fungi and the termite Coptotermes acinaciformis in laboratory bioassays and field conditions
- Development of an accelerated soil-contact decay test
- Obituary Dr. Bo Hortling (1942–2006)
