Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 57, Issue 18, Pages 8236-8243Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf901095w
Keywords
P-31 NMR; EMAL; ionic liquids; spruce; eucalpytus; corn
Funding
- Agency for Technology and Innovation (TEKES)
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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]CI and [bnmim]CI followed by labeling of hydroxyl groups as phosphite esters and quantitative P-31 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 P-31 NMR analysis were established with a notable improvement observed upon the lignin enrichment steps.
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