Topochemical Characterisation of Phenolic Extractives in Discoloured Beechwood (Fagus sylvatica L.)
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G. Koch
Summary
The topochemical distribution of phenolic extractives in steamed and kiln-dried beechwood with discolourations was investigated on a cellular level by using scanning UV microspectrophotometry (UMSP). For the chemical characterisation of accessory compounds, acetone and methanol extracts of the discoloured beechwood were separated by accelerated solvent extraction (ASE) and analysed with high performance liquid chromatography (HPLC). The UV microscopic investigations reveal that the accessory compounds responsible for the discolouration of beechwood are mainly restricted to the longitudinal and ray parenchyma cells and the lumen of vessels. The detected extractives are characterised by high UV absorbance values and an absorbance maximum in a wavelength range between 280 and 290 nm. The separation of the acetone and methanol extracts of discoloured beechwood shows the presence of different low molecular phenols such as catechin and 2,6-dimethoxybenzochinon, which are transformed into high condensation compounds during steaming and kiln-drying.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Topochemical Characterisation of Phenolic Extractives in Discoloured Beechwood (Fagus sylvatica L.)
- Detection and Species Identification of Wood-Decaying Fungi by Hybridization of Immobilized Sequence-Specific Oligonucleotide Probes with PCR-Amplified Fungal Ribosomal DNA Internal Transcribed Spacers
- Analysis of Protein Expression along the Normal to Tension Wood Gradient in Eucalyptus gunnii
- Phenolic and Lipophilic Extractives in Scots Pine Knots and Stemwood
- Chemical Characterisation of Wood of Roman Ships Brought to Light in the Recently Discovered Ancient Harbour of Pisa (Tuscany, Italy)
- Lignin Structures in Normal and Compression Wood. Evaluation by Thioacidolysis Using Ethanethiol and Methanethiol
- Lignin-Carbohydrate Condensation Product Formation in a Biomimetic Model Pulp Bleaching System
- Viscoelastic Behaviour of Wood Fibres during the Hot Pressing of Medium Density Fibreboard
- Measuring Relative Fibre Length in Scots Pine by Non-Destructive Wood Sampling
- Modelling Log-End Cracks Due to Growth Stresses: Calculation of the Elastic Energy Release Rate
- Modeling Ovendry Softwood Resistivity Based on the Resistor Network Theory
- Comparison of the TL-Shear Strength of Normal and Compression Wood of European Larch
- A Theoretical Analysis of Timber Drying in Oscillating Climates
- Comparing the Effect of Chemical and Physical Properties on Complex Electrical Impedance of Scots Pine Wood
- Wood-Derived Porous Ceramics via Infiltration of SiO2-Sol and Carbothermal Reduction
- Manufacture of Fiberboard from Wood Fibers Activated with Fentons Reagent (H2O2/FeSO4)
