Solubility study of lignin in industrial organic solvents and investigation of electrochemical properties of spray-coated solutions

Dastpak, Arman; Lourenҫon, Tainise V.; Balakshin, Mikhail; Hashmi, Syed Farhan; Lundström, Mari; Wilson, Benjamin P.

doi:10.1016/j.indcrop.2020.112310

Cited by 45 publications

(31 citation statements)

References 50 publications

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“…The composition and structure of the technical lignins listed in Table 2 was generally in good agreement with previous reports on lignins from similar sources. 3 , 31 − 33 , 44 , 45 …”

Section: Resultsmentioning

confidence: 99%

Morphological and Wettability Properties of Thin Coating Films Produced from Technical Lignins

et al. 2020

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Technical lignins are widely available as side streams from pulping and biorefining processes. The aromatic structure of such lignins could be exploited in coating formulations to provide antioxidant or UV-blocking functionalities to packaging films. In this study, six technical lignins sourced from different plant species by given isolation/modification methods were compared for their composition, molar mass, and functional groups. The lignins were then used to prepare thin spin-coated films from aqueous ammonia media. All the lignins formed ultrathin (<12 nm), smooth (roughness < 2 nm), and continuous films that fully covered the solid support. Most of the films contained nanometer-sized particles, while those from water-insoluble lignins also presented larger particulate features, which likely originated from macromolecular association during solvent evaporation. These latter films had water contact angles (WCAs) between 40 and 60°, corresponding to a surface energy of 42–48 mJ/m 2 (determined by Zisman plots). For comparison, the water wettability measured on lignin pellets obtained by mechanical compression tracked closely with the WCA obtained from the respective thin films. Considering the widely diverse chemical, molecular, and structural properties of the tested lignins, comprehensively documented here by using a battery of techniques, the solubility in water was found to be the most important and generic parameter to characterize the thin films. This points to the possibility of developing lignin coatings with predictable wetting behavior.

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“…The composition and structure of the technical lignins listed in Table 2 was generally in good agreement with previous reports on lignins from similar sources. 3 , 31 − 33 , 44 , 45 …”

Section: Resultsmentioning

confidence: 99%

Morphological and Wettability Properties of Thin Coating Films Produced from Technical Lignins

et al. 2020

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“…Moreover, for the VNbased phthalonitrile monomer, this temperature was different from the petroleum-based monomers [117]. Regarding the processing window temperature for the cured AMPN, the first stage occurred from 200 to 280 • C due to the [3,3] sigma rearrangement, and the second stage was above 280 • C, which was attributed to the polymerization of phthalonitrile. The third stage occurred at 330 • C, attributed to the self-polymerization.…”

Section: Vn-based Resinsmentioning

confidence: 94%

“…Lignin has been used in limited industrial applications due to the complex structure with amphiphilic nature. Lignin is commonly soluble in dimethyl sulfoxide, but it also soluble in some organic solvents and aqueous organic solvent solution [ 3 , 4 ]. Despite the complex structure, lignin has recently attracted interest in many applications due to its inherent potential from its unique behaviors, such as antioxidants in plastics, scavengers, surfactants, and dispersants antibacterial, antitumoral, and adhesives [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Research Progress on Lignin-Derived Resins for Natural Fiber Composite Applications

et al. 2021

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By increasing the environmental concerns and depletion of petroleum resources, bio-based resins have gained interest. Recently, lignin, vanillin (4-hydroxy-3-methoxybenzaldehyde), and divanillin (6,6′-dihydroxy-5,5′-dimethoxybiphenyl-3,3′-dicarbaldehyde)-based resins have attracted attention due to the low cost, environmental benefits, good thermal stability, excellent mechanical properties, and suitability for high-performance natural fiber composite applications. This review highlights the recent use of lignin, vanillin, and divanillin-based resins with natural fiber composites and their synthesized processes. Finally, discussions are made on the curing kinetics, mechanical properties, flame retardancy, and bio-based resins’ adhesion property.

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“…The solubility of lignin-related materials and even lowmolecular-weight model compounds is in most cases low in acidic aqueous solutions. Cosolvents, such as various alcohols, 1,4-dioxane, pyridine, DMSO, or ionic liquids, are typically used to increase the solubility of these materials and compounds and to facilitate catalytic reactions while maintaining mild reaction conditions (Schuerch, 1952;Schutyser et al, 2018;Dastpak et al, 2020). Therefore, the stability of the O. rivulosa laccases was first determined in the presence of organic cosolvent ethanol, 1-butanol, or 1,4-dioxane for 2.5 h. After the enzymes were pooled out from the solvent mixtures and the residual activities were measured, both laccases were found to tolerate the solvent mixtures well, as they retained their activity or were activated in the tested conditions (Supplementary Figure 1).…”

Section: Activity and Stability Of O Rivulosa Laccases In Solvent Symentioning

confidence: 99%

Applicability of Recombinant Laccases From the White-Rot Fungus Obba rivulosa for Mediator-Promoted Oxidation of Biorefinery Lignin at Low pH

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Maltari

Mikkilä

et al. 2020

Front. Bioeng. Biotechnol.

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Utilization of lignin-rich side streams has been a focus of intensive studies recently. Combining biocatalytic methods with chemical treatments is a promising approach for sustainable modification of lignocellulosic waste streams. Laccases are catalysts in lignin biodegradation with proven applicability in industrial scale. Laccases directly oxidize lignin phenolic components, and their functional range can be expanded using low-molecular-weight compounds as mediators to include non-phenolic lignin structures. In this work, we studied in detail recombinant laccases from the selectively lignin-degrading white-rot fungus Obba rivulosa for their properties and evaluated their potential as industrial biocatalysts for the modification of wood lignin and lignin-like compounds. We screened and optimized various laccase mediator systems (LMSs) using lignin model compounds and applied the optimized reaction conditions to biorefinery-sourced technical lignin. In the presence of both N–OH-type and phenolic mediators, the O. rivulosa laccases were shown to selectively oxidize lignin in acidic reaction conditions, where a cosolvent is needed to enhance lignin solubility. In comparison to catalytic iron(III)–(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidation systems, the syringyl-type lignin units were preferred in mediated biocatalytic oxidation systems.

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Solubility study of lignin in industrial organic solvents and investigation of electrochemical properties of spray-coated solutions

Cited by 45 publications

References 50 publications

Morphological and Wettability Properties of Thin Coating Films Produced from Technical Lignins

Morphological and Wettability Properties of Thin Coating Films Produced from Technical Lignins

Recent Research Progress on Lignin-Derived Resins for Natural Fiber Composite Applications

Applicability of Recombinant Laccases From the White-Rot Fungus Obba rivulosa for Mediator-Promoted Oxidation of Biorefinery Lignin at Low pH

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