1. Study of Nitrogen-Containing Products of the Interaction of 1-Butyl-3-Methylimidazolium Cation with Lignin by MALDI Mass Spectrometry.
- Author
-
Belesov, A. V., Anikeenko, E. A., Faleva, A. V., Ul'yanovskii, N. V., and Kosyakov, D. S.
- Subjects
- *
MATRIX-assisted laser desorption-ionization , *NITROGEN compounds , *MASS spectrometry , *LIGNINS , *LIGNIN structure , *MOLECULAR weights - Abstract
Ionic liquids based on 1-butyl-3-methylimidazolium (bmim) cations are capable of completely dissolving lignocellulosic biomass at elevated temperatures and are considered promising "green" solvents for creating new technologies for processing renewable plant feedstock (biorefining). Lignins obtained in such processes are characterized by the presence of significant amounts of nitrogen, while the nature of nitrogen-containing compounds in their chemical composition has not been fully elucidated yet. In the present work, MALDI mass spectrometry, capable of selectively recording signals of nitrogen-containing compounds, is proposed to study ionic liquid lignins (ILL). Model preparations of ILs obtained by treating spruce dioxane lignin with a [bmim]OAc ionic liquid at temperatures of 80–150°C are chosen as test samples. The recorded MALDI mass spectra show signals from hundreds of nitrogen-containing lignin oligomers with molecular weights up to 1500 Da. A feature of tandem mass spectra obtained using the CID technique is the presence of bmim signals, which indicates the covalent binding of the ionic liquid cation with lignin oligomers. An assumption has been made about the mechanism of such binding, which proceeds mainly with the participation of carbonyl groups in the lignin structure. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF