Characterization of lignin extracted from birch wood by a modified hydrotropic process

Konstantin Gabov, Richard J.A. Gosselink, Annika I. Smeds, Pedro Fardim*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

60 Citations (Scopus)


In this work an environmentally friendly hydrotropic process was used to extract lignin from industrial birch wood chips. Two hydrotropic treatments were performed, a conventional and a modified process. The lignins were characterized using FTIR, pyrolysis-gas chromatography-mass spectrometry (pyrolysis-GC-MS), 31P and 1H-13C HSQC NMR, and size exclusion chromatography (SEC). The chemical (carbohydrates, extractives, etc.) and elemental compositions of the lignins were also determined. The yields of both lignins were 16.1% (dry wood basis), and the obtained lignins had very low contents of non-lignin compounds. The treatments resulted in significant changes of the structure of the lignins, a decrease in aliphatic hydroxyls and an increase in phenolic ones. The lignin isolated by the modified treatment underwent more substantial change than the reference one. It is believed that the data presented will facilitate utilization of hydrotropic lignin and promote the adoption of the hydrotropic process in the pulp and biorefinery industry.

Original languageEnglish
Pages (from-to)10759-10767
Number of pages9
JournalJournal of Agricultural and Food Chemistry
Issue number44
Publication statusPublished - 5 Nov 2014


  • FTIR
  • hydrotropic lignin
  • lignin characterization
  • modified hydrotropic treatment
  • NMR
  • pyrolysis-GC-MS
  • SEC


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