THE ELABORATION OF NMR ANALYSIS OF DIFFERENT TYPES OF HYDROXYL GROUPS IN THE LIGNIN SAMPLES
Abstract
Lignin is one of the most abundant biopolymers and a potential renewable source of valuable aromatic compounds. Concerning this, actual problem is functional composition characterization of the lignin samples and the products of their chemical processing. The subject of research is the modification of 31P NMR analysis of different types of hydroxyl groups in the lignin samples. We proposed the phosphitylation of lignin and the quantitative 31P NMR analysis using nondeuterated solvent in order to decrease the cost of experiment. 31P NMR spectra are registered using deuterated and nondeuterated solvents in order to compare them. It is obtained that the use of nondeuterated solvent in mixture doesn’t influence on the chemical shifts of the 31P NMR spectra and the results of quantitative estimation of the content of different hydroxyl groups in lignin macromolecule. The experiments with lignin model compound confirm the adequacy of chosen approach. The method is approbated on the sample of dioxane lignin of birch and the quantitative analysis of hydroxyl groups content is implemented.Downloads
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