Abstract
The structures of synthetic lignins (DHPs), milled wood lignins (MWLs), Brauns native lignins, and cell culture lignins were elucidated by 2- and 3-D NMR spectroscopy. Also, similar studies were performed on kraft and residual hardwood lignins, and solid-state NMR studies were performed. Significant structural similarity between MWLs, Brauns lignins, and cell culture lignins was obsd. The results indicated that the most important branching units in softwood lignins are of dibenzodioxocine (5-5-O-4) type, their abundance being probably ≤20-25% of the total of phenylpropane units. Evidence for the occurrence of non-cyclic benzyl aryl ether in lignins was found in only 1 case, in 3D study of 13C enriched aspen. The anal. of residual lignins suggest that these lignins lack the characteristics of in situ lignins, the abundance of β-O-4 structures being very low in residual hardwood kraft lignin. [on SciFinder(R)]
| Translated title of the contribution | On the application of multidimensional NMR methods in the search for chemical structure of lignins in situ and in pulps. |
|---|---|
| Original language | English |
| Title of host publication | Advances in lignocellulosics chemistry for ecologically friendly pulping and bleaching technologies |
| Editors | A. Varios |
| Number of pages | 3 |
| Place of Publication | Aviero |
| Publisher | University of Aveiro |
| Publication date | 1998 |
| Pages | 465-467 |
| ISBN (Print) | 972-8021-66-6 |
| Publication status | Published - 1998 |
| MoE publication type | A4 Article in conference proceedings |
| Event | 5th European Workshop on Lignocellulosics and Pulp (EWLP'98) - Aviero, Portugal Duration: 1 Jan 1800 → … Conference number: 5 |
Fields of Science
- lignin mol structure detn NMR spectroscopy
- 116 Chemical sciences