Molecular dynamics study of lignin constituents in water
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Xiao Yi Li
Abstract
Molecular dynamics simulations were used to explore the distribution of linkages in coumaryl alcohol and coniferyl alcohol systems, including monomeric systems and monomers interacting with β-O4 dimers, respectively. Studying the interactions of two monolignols and the corresponding dimers sheds light on the preferred mechanism of reaction of the growing lignin polymer from the view of kinetic factors. The energy change upon association was quantified, and the distances between the centers of mass of different molecules, and the relative orientations between the phenol groups were calculated for all the systems. Using a cut-off threshold of 4 Å to indicate association leading to bond formation, it is concluded that the presence of the additional methoxy group on coniferyl alcohol assists in promoting interaction of the O4 group with the second moiety. Based on the computed data it is furthermore concluded that in aqueous solution, the most likely model of polymerization is that involving initial dimer formation, followed by dimer-dimer association.
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Articles in the same Issue
- Molecular dynamics study of lignin constituents in water
- Oxidative cellulose degradation by cellobiose dehydrogenase from Phanerochaete chrysosporium: A model compound study
- Characterization of active oxygen species under oxygen-alkali bleaching conditions
- Erythro/threo ratio of β-O-4-5 structures as an important structural characteristic of lignin. Part 4: Variation in the erythro/threo ratio in softwood and hardwood lignins and its relation to syringyl/guaiacyl ratio
- Stereoisomers of 3,3′-dimethoxy-4,4′-stilbenequinone
- Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation
- Condensed tannins from steamed Acacia mearnsii bark
- Chemical composition and antifungal activity of essential oil isolated from Chamaecyparis formosensis Matsum. wood
- Direct measurement of strain distribution along a wood bond line. Part 1: Shear strain concentration in a lap joint specimen by means of electronic speckle pattern interferometry
- Direct measurement of strain distribution along a wood bond line. Part 2: Effects of adhesive penetration on strain distribution
- Rate-independent mechanical behavior of biaxially stressed wood: Experimental observations and constitutive modeling as an orthotropic two-surface elasto-plastic material
- Characterization of sugar maple wood-polymer composites: Monomer retention and polymer retention
- New insights into wood and cement interaction
- Wood-water sorption isotherm prediction with artificial neural networks: A preliminary study
- Hygroscopicity of resorcinol-formaldehyde resin and aqueous vinyl polymer-isocyanate resin in high humidity
- Modelling anisotropic maturation strains in wood in relation to fibre boundary conditions, microstructure and maturation kinetics
- Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 3: Mechanical characterisation
- Resistance of thermo-hygro-mechanically densified wood to colonisation and degradation by brown-rot fungi
- Microbial colonizers of freshly sawn yellow-poplar (Liriodendron tulipifera L.) lumber in two seasons. Part 3: Yeasts
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- Differentiation of indoor wood decay fungi with MALDI-TOF mass spectrometry
- Horst H. Nimz celebrates his 75th birthday on April, 21st, 2005
- Erratum