On the application of multidimensional NMR methods in the search for chemical structure of lignins in situ and in pulps

Jussi Sipilä, E Ammalahti, I Kilpelainen, B Bujanovic, B Hortling, S L Maunu, G Brunow

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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)]
Original languageEnglish
Title of host publicationAdvances in lignocellulosics chemistry for ecologically friendly pulping and bleaching technologies
EditorsA. Varios
Number of pages3
Place of PublicationAviero
PublisherUniversity of Aveiro
Publication date1998
Pages465-467
ISBN (Print)972-8021-66-6
Publication statusPublished - 1998
MoE publication typeA4 Article in conference proceedings
Event5th 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

Cite this

Sipilä, J., Ammalahti, E., Kilpelainen, I., Bujanovic, B., Hortling, B., Maunu, S. L., & Brunow, G. (1998). On the application of multidimensional NMR methods in the search for chemical structure of lignins in situ and in pulps. In A. Varios (Ed.), Advances in lignocellulosics chemistry for ecologically friendly pulping and bleaching technologies (pp. 465-467). Aviero: University of Aveiro.