Structural and thermal characterization of novel organosolv lignins from wood and herbaceous sources

Anna Trubetskaya, Heiko Lange, Bernd Wittgens, Anders Brunsvik, Claudia Crestini, Ulrika Rova, Paul Christakopoulos, J. J. Leahy, Leonidas Matsakas

Research output: Contribution to journalArticlepeer-review

Abstract

This study demonstrates the effects of structural variations of lignins isolated via an organosolv process from different woody and herbaceous feedstocks on their thermal stability profiles. The organosolv lignins were first analysed for impurities, and structural features were determined using the default set of gel permeation chromatography, FT-IR spectroscopy, quantitative 31P NMR spectroscopy and semi-quantitative 1H-13C HSQC analysis. Pyrolysis-, O2-and CO2-reactivity of the organosolv lignins were investigated by thermogravimetric analysis (TGA), and volatile formation in various heating cycles was mapped by head-space GC-MS analysis. Revealed reactivities were correlated to the presence of identified impurities and structural features typical for the organosolv lignins. Data suggest that thermogravimetric analysis can eventually be used to delineate a lignin character when basic information regarding its isolation method is available.

Original languageEnglish
Article number860
JournalProcesses
Volume8
Issue number7
DOIs
Publication statusPublished - Jul 2020

Keywords

  • P NMR
  • Heat treatment
  • HSQC
  • Lignin
  • Organosolv fractionation
  • TGA

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