Structural Characterization of Wheat Straw Lignin as Revealed by Analytical Pyrolysis, 2D-NMR, and Reductive Cleavage Methods
Instituto de Recursos Naturales y Agrobiología de Sevilla · University of Wisconsin–Madison · +2 more institutions
Abstract
The structure of the lignin in wheat straw has been investigated by a combination of analytical pyrolysis, 2D-NMR, and derivatization followed by reductive cleavage (DFRC). It is a p-hydroxyphenyl-guaiacyl-syringyl lignin (with an H:G:S ratio of 6:64:30) associated with p-coumarates and ferulates. 2D-NMR indicated that the main substructures present are β-O-4'-ethers (∼~75%), followed by phenylcoumarans (~11%), with lower amounts of other typical units. A major new finding is that the flavone tricin is apparently incorporated into the lignins. NMR and DFRC indicated that the lignin is partially acylated (~10%) at the γ-carbon, predominantly with acetates that preferentially acylate guaiacyl (12%) rather than…
Citation impact
- FWCI
- 24.22
- Percentile
- 100%
- References
- 65
Authors
6- JCJosé C. del Rı́oCorresponding
Instituto de Recursos Naturales y Agrobiología de Sevilla
- JRJorge Rencoret
University of Wisconsin–Madison, Instituto de Recursos Naturales y Agrobiología de Sevilla, Great Lakes Bioenergy Research Center
- PPPepijn Prinsen
Instituto de Recursos Naturales y Agrobiología de Sevilla
- ÁTÁngel T. Martı́nez
Centro de Investigaciones Biológicas Margarita Salas
- JRJohn Ralph
Great Lakes Bioenergy Research Center, University of Wisconsin–Madison
Topics & keywords
- Tricin
- Lignin
- Derivatization
- Chemistry
- Monomer
- Carbon-13 NMR
- Cellulose
- Straw