In situ determination of lignin phenolics and wood solubility in imidazolium chlorides using31P NMR

Alistair W.T. King, Luca Zoia, Ilari Filpponen, Anna Olszewska, X. I.E. Haibo, Ilkka Kilpeläinen, Dimitris S. Argyropoulos

Research output: Contribution to journalArticleScientificpeer-review

70 Citations (Scopus)

Abstract

Corn stover, Norway spruce, and Eucalyptus grandis were pulverized to different degrees. These samples were subjected to quantitative analyses, upon the basis of predissolution into the imidazolium chloride-based ionic liquids [amim]Cl and [bnmim]Cl followed by labeling of hydroxyl groups as phosphite esters and quantitative 31P NMR analysis. Analysis of different pulverization degrees provided semiempirical data to chart the solubility of Norway spruce in these ionic liquids. Further method refinment afforded an optimized method of analysis of the lignin phenolic functionalities, without prior isolation of the lignin from the fiber. The lignin in these samples was further enriched using cellulase and acidolysis treatments, allowing for comparison with the fibrous samples. Analysis of all samples charts the polymerized-monomer availability for each stage of the treatment. Conditions required for adequate signal-to-noise ratios in the 31P NMR analysis were established with a notable improvement observed upon the lignin enrichment steps.

Original languageEnglish
Pages (from-to)8236-8243
Number of pages8
JournalJournal of Agricultural and Food Chemistry
Volume57
Issue number18
DOIs
Publication statusPublished - 23 Sep 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • p nmr
  • Corn
  • EMAL
  • Eucalpytus
  • Ionic liquids
  • Spruce

Fingerprint

Dive into the research topics of 'In situ determination of lignin phenolics and wood solubility in imidazolium chlorides using31P NMR'. Together they form a unique fingerprint.

Cite this