Structural characteristics of different softwood lignins according to 1D and 2D NMR spectroscopy

Faleva, Anna V.; Kozhevnikov, A. Yu.; Покрышкин, С. А.; Falev, Danil I.; Shestakov, S. L.; Popova, Julia A.

doi:10.1080/02773813.2020.1722702

Cited by 27 publications

(18 citation statements)

References 26 publications

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“…Furthemore, the lower molar mass of esGGM (1.5 kDa) likely increased the relative abundance of phenylglycoside bonds in the molecule, favoring their visualization. It is noteworthy that extractive compounds in spruce wood, such as stilbene and flavonoid, can also occur as glycosides. , The occurrence of hydroxystilbene-glycoside (δC/δH 108–100/6.5–5.9 ppm) and flavones (δC/δH 71.7/4.52; 83.0/5.00; 95.0/5.9; 96.0/5.9 ppm) in softwood were recently reported in the literature. , Although these compounds can be extracted by hot water extraction and concentrated by ethanol in esGGM, their typical signals distinguished from that used herein for the identification of phenylglycoside (δC/δH 102–99/5.2–4.8 ppm).…”

Section: Resultsmentioning

confidence: 99%

Enrichment and Identification of Lignin–Carbohydrate Complexes in Softwood Extract

Carvalho

Lahtinen

Lawoko

et al. 2020

ACS Sustainable Chem. Eng.

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Lignin−carbohydrate complexes (LCCs) are hybrid structures containing covalently linked moieties of lignin and carbohydrates. The structure and behavior of LCCs affect both industrial processes and practical applications of lignocellulosic biomass. However, the identification of phenylglycoside, benzylether, and gamma (γ)-ester LCC bonds in lignocellulosic biomass is limited due to their relatively low abundance compared to plain carbohydrate and lignin structures. Herein, we enriched the LCC bonds in softwood galactoglucomannan (GGM)-rich extract fractionated by (1) a solvent (ethanol), (2) enzymes, and (3) physical techniques. Two-dimensional nuclear magnetic resonance (NMR) spectroscopy analysis was used to identify the LCC bonds. Phenylglycoside and benzylether bonds were concentrated in the ethanol-soluble GGM fractions. A benzylether bond was concentrated into GGM fractions containing larger molecules (>500 Da) through physical techniques. The γ-ester bond was identified in all studied GGM fractions, which is explained by its stability and possible presence in residual xylan. In summary, we demonstrated the potential of the suggested techniques to enrich LCC bonds in softwood extract and improve LCC identification. Such techniques may also enable further studies on the structure and functionality of LCC bonds and open new prospects in the engineering of biomolecules.

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Section: Resultsmentioning

confidence: 99%

Enrichment and Identification of Lignin–Carbohydrate Complexes in Softwood Extract

Carvalho

Lahtinen

Lawoko

et al. 2020

ACS Sustainable Chem. Eng.

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“…In this work, different synthesized mats were measured for their surface electrical charges. The surface electrical charge of the lignin was completely negative due to abundant hydroxyl and phenolic compounds in its structure as well as hydrogenation and decarbonylation alkyl groups [56]. Instead, the NH 3 + groups in the PAMAM revealed a positive zeta potential.…”

Section: Surface Chargementioning

confidence: 98%

Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats

et al. 2021

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Blending lignin as the second most abundant polymer in Nature with nanostructured compounds such as dendritic polymers can not only add value to lignin, but also increase its application in various fields. In this study, softwood Kraft lignin/polyamidoamine dendritic polymer (PAMAM) blends were fabricated by the solution electrospinning to produce bead-free nanofiber mats for the first time. The mats were characterized through scanning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, zeta potential, and thermogravimetry analyses. The chemical intermolecular interactions between the lignin functional groups and abundant amino groups in the PAMAM were verified by FTIR and viscosity measurements. These interactions proved to enhance the mechanical and thermal characteristics of the lignin/PAMAM mats, suggesting their potential applications e.g. in membranes, filtration, controlled release drug delivery, among others.

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“…The surface electrical charge of lignin is completely negative due to abundant hydroxyl and phenolic compounds in its structure as well as hydrogenation and decarbonylation alkyl groups [53]. While, the NH3 + groups in PAMAM reveals the positive zeta potential.…”

Section: Surface Chargementioning

confidence: 99%

Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats

Akbari¹,

Bahi²,

Farahani³

et al. 2020

Preprint

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Blending lignin as the second most abundant polymer in nature with nanostructured compounds such as dendritic polymers will not only add value to lignin, but also increase its application in various fields. In this study, softwood Kraft lignin/polyamidoamine dendritic polymer (PAMAM) blends were fabricated by solution electrospinning method to produce bead-free nanofiber mats. The mats were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), zeta potential, and thermogravimetry analysis (TGA). The chemical intermolecular interactions between lignin functional groups and abundant amino groups in PAMAM were investigated by FTIR and viscosity measurement. These interactions enhanced the mechanical and thermal characteristics of lignin/PAMAM mats, providing further potential applications at industry level.

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Structural characteristics of different softwood lignins according to 1D and 2D NMR spectroscopy

Cited by 27 publications

References 26 publications

Enrichment and Identification of Lignin–Carbohydrate Complexes in Softwood Extract

Enrichment and Identification of Lignin–Carbohydrate Complexes in Softwood Extract

Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats

Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats

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