Structural characterization of the lignin from Saxifraga (Saxifraga oppositifolia L.) stems

Faleva, Anna V.; Kozhevnikov, A. Yu.; Покрышкин, С. А.; Belesov, A. V.; Pikovskoi, Ilya I.

doi:10.1016/j.ijbiomac.2020.03.258

Cited by 14 publications

(5 citation statements)

References 43 publications

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“…Moreover, these units were predominantly interconnected via β-O-4′ aryl ether linkages (Aα, δ C /δ H 72.4/4.92; Aβ, δ C /δ H 83.8/4.39; Aγ, δ C /δ H 60.2/3.50) and Cβ–Cβ′ bonds (Bα, δ C /δ H 83.8/4.97; Bγ, δ C /δ H 71.2/3.81), culminating in a three-dimensional network (Figures i,j and S1g). − Correspondingly, the FT-IR spectrum of the powder revealed characteristic peaks indicative of lignin (Figure S1f). Collectively, these analyses substantiated the composition of the brownish powder as a natural lignin and demonstrated the efficacious preparation of HBL.…”

Section: Resultsmentioning

confidence: 94%

All-Biomass-Derived Nanocomposite Films of Pullulan/Lactate-Nanocellulose/Hydrophobic Lignin for Eco-friendly and Practical Plastic Food-Packaging Alternatives

Ding,

Liu,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

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Fully biomass-derived bioplastic packaging can potentially mitigate plastic pollution. Herein, we showed that bioplastics can be generated from pullulan, lactate-nanocellulose (laNC), or hydrophobic lignin (HBL) using simple engineering techniques. Both laNC and HBL were extracted from corn stalks with yields of 22.1% ± 0.5% and 13.7% ± 0.6%, respectively, using a recyclable, ecofriendly, lactic acid−glycine deep eutectic solvent. The fine dispersion of laNC in pullulan (20 mg/g) resulted in a bionanocomposite film (PNC 20 ) with considerably improved tensile strength (76.6 ± 1.9 MPa) which was attributed to increased intramolecular hydrogen bonding. This film, as a food inner package, could be combined with kraft paper wrapping to preserve dry powders, biscuits, and oil. Notably, a sandwich-like film composed of two outer layers of HBL/ laNC (LNC) films and a middle layer of PNC 20 -G300 film (glycerol content: 300 mg/g) exhibited favorable tensile strength (35.1 ± 1.2 MPa), low water vapor permeability (0.0240 ± 0.009 g•m•[m 2 •d•kpa] −1 ), and high water resistance. By variation of the numbers of LNC and PNC layers, various films which could be used as an outer packaging for foodstuffs were produced. All of the films were biosafe and readily degradable without composting or recycling, highlighting their potential in sustainability.

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Section: Resultsmentioning

confidence: 94%

All-Biomass-Derived Nanocomposite Films of Pullulan/Lactate-Nanocellulose/Hydrophobic Lignin for Eco-friendly and Practical Plastic Food-Packaging Alternatives

Ding,

Liu,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

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“…Qualitative analysis of 2D HSQC NMR spectra of the studied lignins and pseudo-NMR spectra representing loading plots of the main components was carried out by comparison with data from the literature sources [5,9,22,[28][29][30][31][32]. The correctness of the identification was confirmed by the presence of all characteristic cross-peaks of the indicated fragments and the compliance of their chemical shifts with the literature data.…”

Section: Lignin Substructure Assignmentsmentioning

confidence: 99%

“…This may indicate that its chemical composition is distinguished with a significant proportion of S-structures and the absence of cinnamic acids which are characteristic of grass lignins. Another illustrative example is the lignin of saxifrage [22], which is located separately on score plots in PC1-PC2 and PC1-PC3 coordinates and goes beyond the confidence interval of herbaceous lignins area. This is due to the intense signals belonging to the H-units, fatty acids, and acetylated β-aryl ethers (Supplementary Figures S3 and S4).…”

Section: Substructurementioning

confidence: 99%

Application of 2D NMR Spectroscopy in Combination with Chemometric Tools for Classification of Natural Lignins

Faleva,

Grishanovich,

Ul’yanovskii

et al. 2023

IJMS

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Lignin is considered a promising renewable source of valuable chemical compounds and a feedstock for the production of various materials. Its suitability for certain directions of processing is determined by the chemical structure of its macromolecules. Its formation depends on botanical origin, isolation procedure and other factors. Due to the complexity of the chemical composition, revealing the structural differences between lignins of various origins is a challenging task and requires the use of the most informative methods for obtaining and processing data. In the present study, a combination of two-dimensional nuclear magnetic resonance (2D NMR) spectroscopy and multivariate analysis of heteronuclear single quantum coherence (HSQC) spectra is proposed. Principal component analysis and hierarchical cluster analysis techniques demonstrated the possibility to effectively classify lignins at the level of belonging to classes and families of plants, and in some cases individual species, with an error rate for data classification of 2.3%. The reverse transformation of loading plots into the corresponding HSQC loading spectra allowed for structural information to be obtained about the latent components of lignins and their structural fragments (biomarkers) responsible for certain differences. As a result of the analysis of 34 coniferous, deciduous, and herbaceous lignins, 10 groups of key substructures were established. In addition to syringyl, guaiacyl, and p-hydroxyphenyl monomeric units, they include various terminal substructures: dihydroconiferyl alcohol, balanopholin, cinnamic acids, and tricin. It was shown that, in some cases, the substructures formed during the partial destruction of biopolymer macromolecules also have a significant effect on the classification of lignins of various origins.

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“…Lignin is a complex heteropolymer, composed of amorphous polyphenolic macromolecules with varied functional groups. − Its heterogeneous aromatic structures comprised mainly of three phenyl propanoid units: p -hydroxyphenyl (H), guaiacyl (G), and syringyl (S) units, linked by various carbon–oxygen and carbon–carbon bonds such as β–O–4, 5–5, 4–O–5, and β–β, to form three-dimensional structures. − Variation and complexity in the molecular structures and compositions of lignin are derived not only from inherited factors such as plant types and plantation regions but also external factors such as extraction and recovery processes. ,,− This has been a great challenge for lignin conversion and processing for desired applications.…”

Section: Introductionmentioning

confidence: 99%

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

Wannid,

Hararak,

Padee

et al. 2023

ACS Omega

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Para-rubber wood (PRW) lignin, extracted from agricultural waste, was successfully melt-spun to fibers and thermo-stabilized without employing auxiliary additives. 31P NMR analysis revealed that PRW-lignin contained mainly a syringyl unit of phenolic C5-substituted OH group, which enabled melt flow during fiber spinning, as well as a guaiacyl unit which offered the ability to cross-link during thermo-stabilization. Thermo-stabilized fibers with no fusion were achieved at 250 °C with the heating rate of 0.1 °C/min. Structural changes in the fibers during stabilization were systematically investigated using FTIR and XPS analyses. From the results, changes in the intensities of characteristic bands relating to C–H stretching, aromatic C–H stretching, and CO stretching indicated structural changes of lignin toward aromaticity via oxidation reactions. XPS analysis of the fibers carbonized at 900, 1000, and 1200 °C revealed an increase in carbon content from 72 to 87 wt %. and a decrease in oxygen content from 28 to 13 wt %. with the increasing carbonization temperature. The weight loss of carbonized fibers was in the range of 73.6 to 88.7%. The high weight loss of fibers carbonized at 1200 °C was explained partly due to the thermal decomposition of disordered carbon. The tensile strength and modulus of carbonized fibers were 163.0 and 275.1 MPa, respectively. This study demonstrates an approach to prepare a fully biomass precursor fiber and contributes to the exploration of the potential use of lignin from biomass waste.

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Structural characterization of the lignin from Saxifraga (Saxifraga oppositifolia L.) stems

Cited by 14 publications

References 43 publications

All-Biomass-Derived Nanocomposite Films of Pullulan/Lactate-Nanocellulose/Hydrophobic Lignin for Eco-friendly and Practical Plastic Food-Packaging Alternatives

All-Biomass-Derived Nanocomposite Films of Pullulan/Lactate-Nanocellulose/Hydrophobic Lignin for Eco-friendly and Practical Plastic Food-Packaging Alternatives

Application of 2D NMR Spectroscopy in Combination with Chemometric Tools for Classification of Natural Lignins

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

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