Bioactive phenolic substances in industrially important tree species. Part 1: Knots and stemwood of different spruce species
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Abstract
Knots (i.e., branch bases inside tree stems) in spruce trees contained remarkably higher concentrations of lignans and oligolignans than the adjacent stemwood. The amount of lignans in some knots exceeded 10% (w w−1) and some knots contained hundreds of times more lignans than the heartwood in the same tree. However, there were large variations between different species and even between different knots in the same tree. 7-Hydroxymatairesinol was the predominant lignan in knots of Picea abies, P. glauca, P. koraiensis, P. mariana, and P. omorika, while liovil and secoisolariciresinol dominated in P. sitchensis and P. pungens. The lignans occur in free form in knots and are easily extracted with polar solvents. In addition to the true lignans, especially the knots contained large amounts of lignan-related oligomeric aromatic substances, here called oligolignans, consisting of three or four phenylpropane units.
7-Hydroxymatairesinol, but also other lignans, could be extracted in large scale from spruce knots at pulp and paper mills. Other potentially important lignans could be produced from 7-hydroxymatairesinol by semisynthesis. The ready availability of large amounts of lignans and oligolignans now enables research to assess their bioactivity and provide the basis for applications in medicine and nutrition or as natural antioxidants and antimicrobial agents in a variety of technical products.
Copyright © 2004 by Walter de Gruyter GmbH & Co. KG
Artikel in diesem Heft
- Bioactive phenolic substances in industrially important tree species. Part 1: Knots and stemwood of different spruce species
- Oligolignans in Norway spruce and Scots pine knots and Norway spruce stemwood
- Delignification mechanism during high-boiling solvent pulping. Part 6: Changes in lignin structure analyzed by 1H-13C correlation 2-D NMR spectroscopy
- Ozonation of conventional kraft and SuperBatch residual lignins in methanol/water and water
- Relationship between dissolution of fiber materials and development of pulp strength in alkaline peroxide bleaching of mechanical pulp
- Nondestructive estimation of tracheid length from sections of radial wood strips by near infrared spectroscopy
- Heat transfer model for estimating pinene emissions from hot-pressing softwood flakeboard
- Monitoring creep-rupture in oriented strandboard using acoustic emission: Effects of moisture content
- Adhesives made from isocyanates and pyrolysis oils for wood composites
- Effect of wood acidity and catalyst on UF resin gel time
- Estimation of green moisture content distribution in hemfir timber by stochastic simulation
- Theoretical exploration of factors affecting dielectric constants of masson pine
- Shrinkage stress of wood during drying under superheated steam above 100°C
- Exploratory evaluation of oscillation drying for thick hemlock timbers
- A biopulping mechanism: Creation of acid groups on fiber
- Enzymatically polymerized phenolic compounds as wood preservatives
- Evaluation of borate formulations as wood preservatives to control subterranean termites in Australia
Artikel in diesem Heft
- Bioactive phenolic substances in industrially important tree species. Part 1: Knots and stemwood of different spruce species
- Oligolignans in Norway spruce and Scots pine knots and Norway spruce stemwood
- Delignification mechanism during high-boiling solvent pulping. Part 6: Changes in lignin structure analyzed by 1H-13C correlation 2-D NMR spectroscopy
- Ozonation of conventional kraft and SuperBatch residual lignins in methanol/water and water
- Relationship between dissolution of fiber materials and development of pulp strength in alkaline peroxide bleaching of mechanical pulp
- Nondestructive estimation of tracheid length from sections of radial wood strips by near infrared spectroscopy
- Heat transfer model for estimating pinene emissions from hot-pressing softwood flakeboard
- Monitoring creep-rupture in oriented strandboard using acoustic emission: Effects of moisture content
- Adhesives made from isocyanates and pyrolysis oils for wood composites
- Effect of wood acidity and catalyst on UF resin gel time
- Estimation of green moisture content distribution in hemfir timber by stochastic simulation
- Theoretical exploration of factors affecting dielectric constants of masson pine
- Shrinkage stress of wood during drying under superheated steam above 100°C
- Exploratory evaluation of oscillation drying for thick hemlock timbers
- A biopulping mechanism: Creation of acid groups on fiber
- Enzymatically polymerized phenolic compounds as wood preservatives
- Evaluation of borate formulations as wood preservatives to control subterranean termites in Australia
