Abstract
Natural lignins are one of the most widespread biopolymers. The main active centers in the lignin macromolecules are phenolic hydroxyl groups. They form lignin macromolecules reactivity. The lignin is considered as a natural polyphenol. The main characteristics of the lignin reactivity are their acid–base and redox properties. Acid–base properties of lignins are characterized by pKa values of basic types of phenolic structures. The redox properties are characterized by effective oxidation potential and the Gibbs energy of the phenolic structures. This paper studies the acid–base and redox properties of the phenolic structures of coniferous and deciduous natural lignins. The authors analyze the representative slightly altered preparations of dioxane lignin extracted from coniferous wood (spruce, common juniper) and deciduous wood (common aspen). The study reveals the differences in the reaction properties of coniferous and deciduous lignins due to their functional nature and macromolecular properties.
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Acknowledgements
This research was funded by the Federal Agency of Scientific Organizations of Russia under the project agreement No. AAAA-A18-118012390231-9 and the Russian Foundation for Basic Research, project No. 14-03-31551 mol_a. We used the equipment of the “Critical Technologies of Russian Federation in the Field of Environmental Safety of Arctic” Centre of Collective Use of Scientific Equipment (Federal Center for Integrated Arctic Research, Russia) and the instrumentation of the Core Facility Center “Arktika” of Northern (Arctic) Federal University, Russia (unique identifier RFMEFI59417X0013).
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Bogolitsyn, K.G., Khviuzov, S.S., Gusakova, M.A. et al. The differences between acid–base and redox properties of phenolic structures of coniferous and deciduous native lignins. Wood Sci Technol 52, 1153–1164 (2018). https://doi.org/10.1007/s00226-018-1008-z
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DOI: https://doi.org/10.1007/s00226-018-1008-z