Extractive composition and summative chemical analysis of thermally treated eucalypt wood
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Bruno Esteves
Abstract
Eucalypt wood (Eucalyptus globulus) was heated in an oven for 2–24 h at 170–200°C and in an autoclave with superheated and saturated steam for 2–12 h at 190–210°C. The chemical composition of untreated wood and thermally treated wood with different mass losses in the range of 1.1–11.9% was studied by summative analysis, and the composition of dichloromethane, ethanol and water extracts was determined by gas chromatography mass spectometry (GC-MS). The hemicelluloses degraded first, mainly regarding the arabinose and xylose moieties. Lignin degraded at a slower rate and cellulose was only slightly affected under severe treatment conditions. The extractive content increased first with heat treatment and decreased later on. Almost all of the original extractives disappeared and new compounds were formed, such as anhydrosugars, mannosan, galactosan, levoglucosan and two C5 anhydrosugars. The most prominent lignin derived compounds were syringaldehyde, syringic acid and sinapaldehyde. The main difference between autoclave and oven treated samples was the appearance of more oxidized extractives for the oven treatment.
©2008 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- Meetings
- Original Papers
- Topochemical investigation on tension wood fibres of Acer spp., Fagus sylvatica L. and Quercus robur L.
- Developing environmentally benign and effective organic wood preservatives by understanding the biocidal and non-biocidal properties of extractives in naturally durable heartwood
- Assessment of biodeterioration for the screening of new wood preservatives: Calculation of stiffness loss in rapid decay testing
- Degradation of thermo-hygro-mechanically (THM)-densified wood by soft-rot fungi
- FT-NIR spectroscopy in predicting the decay resistance related characteristics of solid Scots pine (Pinus sylvestris L.) heartwood
- Effects of fixation temperature and environment on copper speciation in ACQ treated red pine
- Fixation of copper(II)-protein formulation in wood: Part 1. Influence of tannic acid on fixation of copper in wood
- Fixation of copper-protein formulation in wood: Part 2. Molecular mechanism of fixation of copper(II) in cellulose, lignin and wood studied by EPR
- 1-Alkoxymethyl-X-dimethylaminopyridinium-base ionic liquids in wood preservation
- Short Note
- Synthesis and evaluation of phosphortriamidates in wood for thermal and fungal decay protection
- Original Papers
- 3D magnetic resonance microscopy of a wounded beech branch
- Sorption of corn cob and oat spelt arabinoxylan onto softwood kraft pulp
- Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
- Extractive composition and summative chemical analysis of thermally treated eucalypt wood
- Analysis of cell wall swelling on the basis of a cylindrical model
- Swelling of larch wood in organic liquids
- Determination of the thermal conductivity of wood by the hot plate method: The influence of morphological properties of fir wood (Abies alba Mill.) to the contact thermal resistance
- Short Note
- Study of the retarding mechanism of citric acid during gypsum particleboard manufacturing
- Obituary
- William Edwin (Ted) Hillis (1921–2008)
