Structural analysis of hardwood native lignins by quantitative 13C NMR spectroscopy
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Mikhail Yu. Balakshin
,
Ewellyn A. Capanema
Abstract
Milled wood lignins from alkaline pretreated wood with very low sugar content and a wide range of syringyl-to-guaiacyl (S/G) ratio between 1.2 and 3.0 were isolated from 12 industrially valuable hardwood (HW) species. The lignin preparations were investigated by means of a comprehensive 13C nuclear magnetic resonance (NMR) methodology to address the possibilities and limitations of this approach for HW native lignins and to estimate the structural variations within HW lignins. Good correlations were found for different independent methods for the quantification of major lignin moieties. The results were reliable at the C6 level and not only for relative comparison. The correlation was good between methoxyl group determinations by wet chemistry and those by 13C NMR spectroscopy. The limitations of the 13C NMR method were also pointed out. The differences in the S/G ratios can be large, but other structural deviations are less significant. Strong correlations between the S/G ratios and the amounts of other structural peculiarities could not be found by the 13C NMR approach. However, with increasing S/G ratios, the β-O-4 content showed increasing tendencies and the degree of condensation showed decreasing tendencies.
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©2016 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Structural analysis of hardwood native lignins by quantitative 13C NMR spectroscopy
- A light-colored hydroxypropyl sulfonated alkali lignin for utilization as a dye dispersant
- Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
- Testing three proposed DNA barcodes for the wood identification of Dalbergia odorifera T. Chen and Dalbergia tonkinensis Prain
- Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique
- Measurement of moisture-related strain in bonded ash depending on adhesive type and glueline thickness
- The cellular level mode I fracture behaviour of spruce and birch in the RT crack propagation system
- Assessment of wood microstructural changes after one-stage thermo-hydro treatment (THT) by micro X-ray computed tomography
- Failure and failure mechanisms of wood during longitudinal compression monitored by synchrotron micro-computed tomography
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Structural analysis of hardwood native lignins by quantitative 13C NMR spectroscopy
- A light-colored hydroxypropyl sulfonated alkali lignin for utilization as a dye dispersant
- Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
- Testing three proposed DNA barcodes for the wood identification of Dalbergia odorifera T. Chen and Dalbergia tonkinensis Prain
- Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique
- Measurement of moisture-related strain in bonded ash depending on adhesive type and glueline thickness
- The cellular level mode I fracture behaviour of spruce and birch in the RT crack propagation system
- Assessment of wood microstructural changes after one-stage thermo-hydro treatment (THT) by micro X-ray computed tomography
- Failure and failure mechanisms of wood during longitudinal compression monitored by synchrotron micro-computed tomography
