A novel and efficient process for lignin fractionation in biomass-derived glycerol-ethanol solvent system

Liu, Cuiyun; Si, Chuanling; Wang, Guanhua; Jia, Hongge; Ma, Litong

doi:10.1016/j.indcrop.2017.10.005

Cited by 70 publications

(47 citation statements)

References 36 publications

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“…The main active functional groups of three lignin fractions were identified according to previous literature and depicted in Fig. 7(g), 17,28,33 Among three fractions, the signals from xylan were found only in the HSQC spectrum of F3, which was in accordance with the purity analysis. In the aromatic regions, the signals from the three aromatic rings of lignin could be observed clearly in all the spectra of three fractions.…”

Section: Ftir 2d-hsqc and Phenolic Hydroxyl Contentsupporting

confidence: 68%

Successive ethanol–water fractionation of enzymatic hydrolysis lignin to concentrate its antimicrobial activity

Wang

Xia

Liang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND With the emergence of lignocellulose refining, there is an increasing interest in exploring the valuable applications for lignin due to its abundant and underused features. Originating from the physiological function of lignin in plants, this work attempted to evaluate the antimicrobial potential of enzymatic hydrolysis lignin (EHL) from a bioethanol‐derived biorefinery. RESULTS Successive ethanol–water dissolution was employed to fractionate EHL and the antimicrobial activities of three obtained lignin fractions (F1, F2 and F3) were compared by the agar diffusion method and minimum inhibitory concentration (MIC) assays. Interestingly, the results showed that the antimicrobial activities of EHL were centralized in F1 which exhibited obviously growth inhibitory effects against two Gram‐positive (Staphylococcus aureus and Bacillus subtilis) and two Gram‐negative (Escherichia coli and Salmonella enterica) bacteria with MICs of 1, 2, 2 and 2 mg mL−1, respectively. The further characterization suggested that the better solubility and higher phenolic hydroxyl content of F1 caused by lower molecular weight were possibly responsible for the improvement of antimicrobial performance. CONCLUSIONS Consequently, this work suggested that successive ethanol–water fractionation was an effective way to enhance the antimicrobial activity of EHL. © 2018 Society of Chemical Industry

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Section: Ftir 2d-hsqc and Phenolic Hydroxyl Contentsupporting

confidence: 68%

Successive ethanol–water fractionation of enzymatic hydrolysis lignin to concentrate its antimicrobial activity

Wang

Xia

Liang

et al. 2018

J of Chemical Tech & Biotech

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“…[104] Based on the concept of green environmental protection, glycerol was applied with ethanol for lignin fractionation and the results showed that this approach could realize the efficient fractionation of EHL with relatively narrow dispersity. [101] As a novel solvent, the ionic liquid was also investigated to fractionate technical lignin with high purity. [108] In addition, Dai et al developed a novel hydrogel-assisted fractionation approach using lignin-containing cellulose (Cell-AL) hydrogel to fractionate lignin to produce uniform lignins.…”

Section: Further Fractionation Of Ligninmentioning

confidence: 99%

“…Based on the concept of green environmental protection, glycerol was applied with ethanol for lignin fractionation and the results showed that this approach could realize the efficient fractionation of EHL with relatively narrow dispersity . As a novel solvent, the ionic liquid was also investigated to fractionate technical lignin with high purity .…”

Section: Further Fractionation Of Ligninmentioning

confidence: 99%

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

et al. 2020

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Lignin, as the most abundant aromatic biopolymer in nature, has attracted great attention due to the complexity and richness of its functional groups for value‐added applications. The yield of production of lignin and the reactivity of prepared lignin are very important to guarantee the study and development of lignin‐based chemicals and materials. Various fractionation techniques have been developed to obtain high yield and relatively high‐purity lignin as well as carbohydrates (hemicelluloses and celluloses) and to reduce the condensed and degraded nature of conventional biorefinery lignin. Herein, novel and efficient biomass fractionation and lignin fractionation towards lignin valorization are summarized and discussed.

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“…One such method is the LignoBoost process, where kraft lignin is purified in sequential precipitation and filtration steps [ 8 ]. Other alternatives to obtaining lignin materials of high purity with a suitable molecular weight and polydispersity are the ultrafiltration of black liquor with a ceramic membranes or solvent fractionation of lignin [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. There have been several reports in the literature on methods of lignin modification or graft polymerization to obtain lignin-based composites, epoxy resins, biomedical materials, carbon fibers, etc.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Synthesis and Properties of Lignin–Silica Nanocomposites Prepared by Sol-Gel Method

et al. 2018

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The development of advanced hybrid materials based on polymers from biorenewable sources and mineral nanoparticles is currently of high importance. In this paper, we applied softwood kraft lignins for the synthesis of lignin/SiO2 nanostructured composites. We described the peculiarities of composites formation in the sol-gel process through the incorporation of the lignin into a silica network during the hydrolysis of tetraethoxysilane (TEOS). The initial activation of lignins was achieved by means of a Mannich reaction with 3-aminopropyltriethoxysilane (APTES). In the study, we present a detailed investigation of the physicochemical characteristics of initial kraft lignins and modified lignins on each step of the synthesis. Thus, 2D-NMR, 31P-NMR, size-exclusion chromatography (SEC) and dynamic light scattering (DLS) were applied to analyze the characteristics of pristine lignins and lignins in dioxan:water solutions. X-Ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) were used to confirm the formation of the lignin–silica network and characterize the surface and bulk structures of the obtained hybrids. Termogravimetric analysis (TGA) in nitrogen and air atmosphere were applied to a detailed investigation of the thermal properties of pristine lignins and lignins on each step of modification. SEM confirmed the nanostructure of the obtained composites. As was demonstrated, the activation of lignin is crucial for the sol-gel formation of a silica network in order to create novel hybrid materials from lignins and alkoxysilanes (e.g., TEOS). It was concluded that the structure of the lignin had an impact on its reactivity during the activation reaction, and consequently affected the properties of the final hybrid materials.

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A novel and efficient process for lignin fractionation in biomass-derived glycerol-ethanol solvent system

Cited by 70 publications

References 36 publications

Successive ethanol–water fractionation of enzymatic hydrolysis lignin to concentrate its antimicrobial activity

Successive ethanol–water fractionation of enzymatic hydrolysis lignin to concentrate its antimicrobial activity

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

Peculiarities of Synthesis and Properties of Lignin–Silica Nanocomposites Prepared by Sol-Gel Method

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