A detailed structural characterization of the lignin from wheat straw
The structure of the lignin in wheat straw has been investigated by 2D-NMR and DFRC. It is a phydroxyphenyl-guaiacyl-syringyl lignin (with a H:G:S ratio of 6:64:30) associated with p-coumarates and ferulates. The main substructures present are β–O–4´-ethers (~75%), followed by phenylcoumarans (~11%)...
| Authors: | , , , , , |
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| Format: | other |
| Publication Date: | 2014 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/98691 |
| Online Access: | http://hdl.handle.net/10261/98691 |
| Access Level: | Open access |
| Keyword: | Lignin Wheat straw 2D NMR Py-GC/MS |
| Summary: | The structure of the lignin in wheat straw has been investigated by 2D-NMR and DFRC. It is a phydroxyphenyl-guaiacyl-syringyl lignin (with a H:G:S ratio of 6:64:30) associated with p-coumarates and ferulates. The main substructures present are β–O–4´-ethers (~75%), followed by phenylcoumarans (~11%), with lower amounts of other units. The lignin is partially acylated (~10%) at the γ-carbon, predominantly with acetates that preferentially acylate guaiacyl (12%) rather than syringyl (1%) units. p-Coumarate esters were barely detectable (<1%) on monomer conjugates released by selectively cleaving β-ethers in DFRC, indicating that they might be preferentially involved in condensed or terminal structures. A major new finding is that the flavone tricin is apparently incorporated into the lignins. |
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