Determination of carboxyl and non-conjugated carbonyl groups in dissolved and residual lignins by IR spectroscopy

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)

Abstract

FTIR spectroscopy is a well known method for elucidating the structures of lignin samples. Determination of the ratio between the content of C=O groups and aromatic structures in lignin samples is an important aid to monitoring the degree of delignification during different pulping and bleaching procedures. In the present work a semiquantitative method is described in which calibration mixtures with eight different ratios of tartaric acid to milled wood lignin are prepared in order to account for the different responses of the aromatic band at 1510cm-1 and the C=O band at 1740cm-1. From the calibration function obtained it is possible to calculate the results in mmoles of C=O/g aromatic lignin. The method is tested on residual lignins and spent liquor lignins from pulps with different degrees of delignification.

Original languageEnglish
Pages (from-to)405-410
JournalHolzforschung
Volume51
Issue number5
DOIs
Publication statusPublished - 1 Jan 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Lignin
Infrared spectroscopy
Delignification
Calibration
Bleaching
Pulp
Wood
Spectroscopy
Acids
Monitoring

Keywords

  • Carbonyl group
  • Delignification
  • IR spectroscopy
  • Lignin

Cite this

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title = "Determination of carboxyl and non-conjugated carbonyl groups in dissolved and residual lignins by IR spectroscopy",
abstract = "FTIR spectroscopy is a well known method for elucidating the structures of lignin samples. Determination of the ratio between the content of C=O groups and aromatic structures in lignin samples is an important aid to monitoring the degree of delignification during different pulping and bleaching procedures. In the present work a semiquantitative method is described in which calibration mixtures with eight different ratios of tartaric acid to milled wood lignin are prepared in order to account for the different responses of the aromatic band at 1510cm-1 and the C=O band at 1740cm-1. From the calibration function obtained it is possible to calculate the results in mmoles of C=O/g aromatic lignin. The method is tested on residual lignins and spent liquor lignins from pulps with different degrees of delignification.",
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Determination of carboxyl and non-conjugated carbonyl groups in dissolved and residual lignins by IR spectroscopy. / Hortling, Bo; Tamminen, Tarja; Kenttä, Eija.

In: Holzforschung, Vol. 51, No. 5, 01.01.1997, p. 405-410.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Determination of carboxyl and non-conjugated carbonyl groups in dissolved and residual lignins by IR spectroscopy

AU - Hortling, Bo

AU - Tamminen, Tarja

AU - Kenttä, Eija

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AB - FTIR spectroscopy is a well known method for elucidating the structures of lignin samples. Determination of the ratio between the content of C=O groups and aromatic structures in lignin samples is an important aid to monitoring the degree of delignification during different pulping and bleaching procedures. In the present work a semiquantitative method is described in which calibration mixtures with eight different ratios of tartaric acid to milled wood lignin are prepared in order to account for the different responses of the aromatic band at 1510cm-1 and the C=O band at 1740cm-1. From the calibration function obtained it is possible to calculate the results in mmoles of C=O/g aromatic lignin. The method is tested on residual lignins and spent liquor lignins from pulps with different degrees of delignification.

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