Study on the Effect of Sugar Beet Pulp Pretreatment (Beta Vulgaris L.) on the Molecular Structure of Lignin

Background: Lignin is a complex polyphenolic compound with a network structure, which is part of the matrix of the cell wall of higher plants and gives it mechanical rigidity and microbiological resistance. Existing studies of the molecular characteristics of lignin mainly affect the lignin of wood of various species and, in rare cases, the lignin of secondary raw materials, which makes research in this area relevant for different types of plant materials. The article presents studies of the features of the chemical bond between sugar beet lignin (Beta vulgaris L.) and the cell wall matrix. Materials and methods: The object of research is sugar beet pulp. The research methodology included obtaining a preparation of hydrolytic lignin and its spectra in the infrared region.

Results: In the course of the work, it was found that with the exclusion of the hemicellulose extraction stage in the process of preparing raw materials for the production of lignin, the quality of the obtained samples does not change. The results of IR spectroscopy showed that the obtained samples contain pectin in combination with lignin. The interaction of pectin and lignin occurs with the help of ferulic acid residues through ester bonds.
Conclusion: As a result of the research, it was found that the method of extracting lignin from plant materials does not affect the quality of the resulting preparation. In the composition of the matrix of sugar beet cell walls, there is a strong connection of lignin and some part of pectin through bridges from ferulic acid residues. This can potentially contribute to the partial manifestation of the lignin preparation isolated from sugar beet pulp, additional physical and chemical properties.

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