Analysis of the functional group composition of the spruce and birch phloem lignin
| Autor: | D. I. Falev, Aleksandr Yu. Kozhevnikov, Artem V. Belesov, D. G. Chukhchin, Anna V. Faleva, E. V. Novozhilov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Magnetic Resonance Spectroscopy
Chemical structure 02 engineering and technology Phloem Lignin Biochemistry 03 medical and health sciences chemistry.chemical_compound Structural Biology Botany Hardwood Molecular Biology Betula 030304 developmental biology 0303 health sciences biology Chemistry Xylem Picea abies General Medicine Pinaceae 021001 nanoscience & nanotechnology biology.organism_classification Betula pendula Composition (visual arts) 0210 nano-technology |
| Zdroj: | International Journal of Biological Macromolecules. 166:913-922 |
| ISSN: | 0141-8130 |
| Popis: | In this article, the functional group composition of the spruce (Picea abies) and birch (Betula pendula) phloem lignin is described. The features of the chemical structure were studied by analyzing dioxane lignin using the elemental analysis, UV-Vis, FT-IR, and 1D NMR spectroscopy. For comparison, samples of xylem dioxane lignin isolated from the corresponding wood species were also analyzed. FT-IR spectroscopy data suggest that the lignins of birch phloem and xylem are similar in chemical structure. However, there are differences in absorption bands in the spectra of spruce dioxane lignin, which indicate the opposite. Quantitative analysis of the functional group composition was performed using 13C and 31P NMR data. It was found that free phenolic hydroxyl groups of catechol and p-hydroxyphenyl types are dominated in the composition of spruce phloem lignin. Birch phloem lignin has a qualitative and quantitative composition of functional groups characteristic of hardwood lignins. However, the content of G-units is greater than S-units, in contrast to the birch xylem lignin, where S-units predominate. The revealed differences are relevant from the point of view of plant physiology. The practical significance of the study is connected with understanding the reactivity of lignins when considering the chemical processing of tree bark. |
| Databáze: | OpenAIRE |
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