Application of solid-state 13C NMR spectroscopy and dipolar dephasing technique to determine the extent of condensation in technical lignins

T. Liitiä, S. L. Maunu, J. Sipilä, B. Hortling

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

Solid-state 13C NMR spectroscopy and dipolar dephasing technique was used to determine the extent of condensation in various technical lignins. The accuracy of dipolar dephasing method was first investigated with the aid of some lignin model compounds and two various methods to determine the degree of condensation were compared. On the basis of the model compound experiments both methods based on dipolar dephasing technique can be applied to investigate the extent of condensation in lignin. The lignin results indicate that technical softwood lignins, as well as enzymatically isolated wood lignin, are more condensed than milled wood lignin, which is generally assumed to represent native lignin. Residual lignins isolated after oxygen delignification and peroxide bleaching stages were found more condensed than residual lignin in unbleached pulps. In studies of the spent liquor lignins of flow-through kraft pulping the extent of condensation was found to increase as the cooking proceeded.

Original languageEnglish
Pages (from-to)171-186
Number of pages16
JournalSolid State Nuclear Magnetic Resonance
Volume21
Issue number3-4
DOIs
Publication statusPublished - 1 May 2002
MoE publication typeNot Eligible

Fingerprint

lignin
Lignin
Nuclear magnetic resonance spectroscopy
Condensation
condensation
solid state
nuclear magnetic resonance
spectroscopy
Wood
Unbleached pulp
Kraft process
Delignification
Softwoods
Cooking
Peroxides
peroxides
bleaching
Bleaching
Oxygen

Keywords

  • C CPMAS NMR spectroscopy
  • Dipolar dephasing technique
  • Extent of condensation
  • Lignin model compounds
  • Technical lignins

Cite this

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title = "Application of solid-state 13C NMR spectroscopy and dipolar dephasing technique to determine the extent of condensation in technical lignins",
abstract = "Solid-state 13C NMR spectroscopy and dipolar dephasing technique was used to determine the extent of condensation in various technical lignins. The accuracy of dipolar dephasing method was first investigated with the aid of some lignin model compounds and two various methods to determine the degree of condensation were compared. On the basis of the model compound experiments both methods based on dipolar dephasing technique can be applied to investigate the extent of condensation in lignin. The lignin results indicate that technical softwood lignins, as well as enzymatically isolated wood lignin, are more condensed than milled wood lignin, which is generally assumed to represent native lignin. Residual lignins isolated after oxygen delignification and peroxide bleaching stages were found more condensed than residual lignin in unbleached pulps. In studies of the spent liquor lignins of flow-through kraft pulping the extent of condensation was found to increase as the cooking proceeded.",
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Application of solid-state 13C NMR spectroscopy and dipolar dephasing technique to determine the extent of condensation in technical lignins. / Liitiä, T.; Maunu, S. L.; Sipilä, J.; Hortling, B.

In: Solid State Nuclear Magnetic Resonance, Vol. 21, No. 3-4, 01.05.2002, p. 171-186.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Application of solid-state 13C NMR spectroscopy and dipolar dephasing technique to determine the extent of condensation in technical lignins

AU - Liitiä, T.

AU - Maunu, S. L.

AU - Sipilä, J.

AU - Hortling, B.

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AB - Solid-state 13C NMR spectroscopy and dipolar dephasing technique was used to determine the extent of condensation in various technical lignins. The accuracy of dipolar dephasing method was first investigated with the aid of some lignin model compounds and two various methods to determine the degree of condensation were compared. On the basis of the model compound experiments both methods based on dipolar dephasing technique can be applied to investigate the extent of condensation in lignin. The lignin results indicate that technical softwood lignins, as well as enzymatically isolated wood lignin, are more condensed than milled wood lignin, which is generally assumed to represent native lignin. Residual lignins isolated after oxygen delignification and peroxide bleaching stages were found more condensed than residual lignin in unbleached pulps. In studies of the spent liquor lignins of flow-through kraft pulping the extent of condensation was found to increase as the cooking proceeded.

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