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Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks
The topological structure of the macromolecules of lignins isolated from oat husk and fir wood was studied by means of macromolecular hydrodynamic methods. The macromolecular properties were analyzed by evaluating the intrinsic viscosity and coefficients of the translational diffusion and the sedime...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10489672/ https://www.ncbi.nlm.nih.gov/pubmed/37688250 http://dx.doi.org/10.3390/polym15173624 |
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author | Karmanov, Anatoly Kocheva, Lyudmila Borisenkov, Mikhail Belyi, Vladimir |
author_facet | Karmanov, Anatoly Kocheva, Lyudmila Borisenkov, Mikhail Belyi, Vladimir |
author_sort | Karmanov, Anatoly |
collection | PubMed |
description | The topological structure of the macromolecules of lignins isolated from oat husk and fir wood was studied by means of macromolecular hydrodynamic methods. The macromolecular properties were analyzed by evaluating the intrinsic viscosity and coefficients of the translational diffusion and the sedimentation velocity of the lignins in dilute dimethylformamide solutions. The average molecular weights (M(Dη)) and polydispersity parameters were calculated based on the results of the fractionation, as follows: M(w) = 14.6 × 10(3), M(n) = 9.0, and M(w)/M(n) = 1.62 for lignins from fir wood and M(w) = 14.9 M(n) = 13.5 and M(w)/M(n) = 1.1 for lignins from oat husks. The fractal analysis of the lignin macromolecules allowed us to identify the distinctive characteristics of the fractal and topological structures of these lignins. The measurements indicated that the fractal dimension (d(f)) values of the guaiacyl-syringyl lignins from oat husks were between 1.71 and 1.85, while the d(f) of a typical guaiacyl lignin from fir wood was ~2.3. Thus, we determined that the lignin macromolecules of oat husks belong to the diffusion-limited aggregation-type cluster–cluster class of fractals of the Meakin–Kolb type, with a predominance of characteristics common to a linear configuration. The lignins of softwood fir trees exhibited a branched topological structure, and they belong to the diffusion-limited aggregation-type particle–cluster class of fractals of the Witten–Sander type. Lignins from oat husks have the linear topology of macromolecules while the macromolecules of the lignins from fir wood can be characterized as highly branched polymers. |
format | Online Article Text |
id | pubmed-10489672 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104896722023-09-09 Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks Karmanov, Anatoly Kocheva, Lyudmila Borisenkov, Mikhail Belyi, Vladimir Polymers (Basel) Article The topological structure of the macromolecules of lignins isolated from oat husk and fir wood was studied by means of macromolecular hydrodynamic methods. The macromolecular properties were analyzed by evaluating the intrinsic viscosity and coefficients of the translational diffusion and the sedimentation velocity of the lignins in dilute dimethylformamide solutions. The average molecular weights (M(Dη)) and polydispersity parameters were calculated based on the results of the fractionation, as follows: M(w) = 14.6 × 10(3), M(n) = 9.0, and M(w)/M(n) = 1.62 for lignins from fir wood and M(w) = 14.9 M(n) = 13.5 and M(w)/M(n) = 1.1 for lignins from oat husks. The fractal analysis of the lignin macromolecules allowed us to identify the distinctive characteristics of the fractal and topological structures of these lignins. The measurements indicated that the fractal dimension (d(f)) values of the guaiacyl-syringyl lignins from oat husks were between 1.71 and 1.85, while the d(f) of a typical guaiacyl lignin from fir wood was ~2.3. Thus, we determined that the lignin macromolecules of oat husks belong to the diffusion-limited aggregation-type cluster–cluster class of fractals of the Meakin–Kolb type, with a predominance of characteristics common to a linear configuration. The lignins of softwood fir trees exhibited a branched topological structure, and they belong to the diffusion-limited aggregation-type particle–cluster class of fractals of the Witten–Sander type. Lignins from oat husks have the linear topology of macromolecules while the macromolecules of the lignins from fir wood can be characterized as highly branched polymers. MDPI 2023-09-01 /pmc/articles/PMC10489672/ /pubmed/37688250 http://dx.doi.org/10.3390/polym15173624 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Karmanov, Anatoly Kocheva, Lyudmila Borisenkov, Mikhail Belyi, Vladimir Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title | Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title_full | Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title_fullStr | Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title_full_unstemmed | Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title_short | Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks |
title_sort | macromolecular hydrodynamics and fractal structures of the lignins of fir wood and oat husks |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10489672/ https://www.ncbi.nlm.nih.gov/pubmed/37688250 http://dx.doi.org/10.3390/polym15173624 |
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