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A comprehensive approach for quantitative lignin characterization by NMR spectroscopy.
Comparison of the calculated results with known databases on spruce MWL structure shows that the suggested approach is rather informative and comparable with the information obtained from the combination of various wet chemistry methods. Expand
Quantification of lignin–carbohydrate linkages with high-resolution NMR spectroscopy
The data obtained indicate that pinewood contains higher amounts of benzyl ether LCC linkages, but lower amounts of phenyl glycoside and γ-ester LCC moieties as compared to birch wood. Expand
Quantitative characterization of a hardwood milled wood lignin by nuclear magnetic resonance spectroscopy.
The combination of 2D NMR and quantitative 13C NMR spectroscopy of nonacetylated and acetylated lignin preparations allowed reliable identification and calculation of the amount of different lign in structures. Expand
MWL fraction with a high concentration of lignin-carbohydrate linkages: Isolation and 2D NMR spectroscopic analysis
Abstract A preparation enriched in lignin-carbohydrate fragments (LCC-AcOH) was isolated in the course of purification of loblolly pine crude milled wood lignin (MWL). The preparation containedExpand
In an attempt to explain variations in delignification behaviors among different hardwood species, the kraft pulping delignification rates of Eucalyptus urograndis, E. nitens, E. globulus, sweet gum,Expand
On the Quantification of Lignin Hydroxyl Groups With 31P and 13C NMR Spectroscopy
Factors affecting the accuracy of the analysis of lignin hydroxyl and carboxyl groups with 31P NMR have been further elucidated. Two modifications of 31P NMR analysis of lignin, namely the protocolsExpand
Elucidation of the structures of residual and dissolved pine kraft lignins using an HMQC NMR technique.
Elucidation of the role of condensation reactions indicates that an increase in the degree of lignin condensation during pulping results from accumulation of original condensed lign in moieties rather than from the formation of new alkyl-aryl structures. Expand
Label-free in situ imaging of lignification in the cell wall of low lignin transgenic Populus trichocarpa
Lignification in wild type and lignin-reduced 4CL transgenic Populus trichocarpa stem wood with spatial resolution that is sub-μm is compared, suggesting that transgenic approach may help overcome cell wall recalcitrance to wood saccharification. Expand
Structural Analysis of Residual and Technical Lignins by 1H-13C Correlation 2D NMR-Spectroscopy
Summary Structural analysis was conducted on residual lignin from pine Kraft AQ pulp, Eucalyptus Kraft lignin from Eucalyptus globulus and Repap Organosolv lignin by 2D 13C-1H correlation NMRExpand
Comprehensive structural analysis of biorefinery lignins with a quantitative 13C NMR approach
The advance in analytical methodology is critical for the progress in the biorefinery and lignin commercialization. This paper reports a comprehensive approach (more than 30 common structuralExpand