Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment

Krutov, S. M.; Evtuguin, Dmitry V.; Ipatova, Elena V.; Santos, Sónia A.O.; Sazanov, Yu. N.

doi:10.1515/hf-2014-0264

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…The molecular weight was ≈1000 Da, as determined by size-exclusion chromatography. Structural characterization carried out by employing tandem electrospray ionization-mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy revealed that upgraded lignins are oligomers (trimerspentamers) with highly degraded propane chains and possess polyconjugated condensed aromatic structures [27,28].…”

Section: Preparation Of Filmsmentioning

confidence: 99%

Biocomposite Materials Based on Chitosan and Lignin: Preparation and Characterization

et al. 2021

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In this study, bioactive composite systems based on natural polymers (chitosan and lignin) were prepared in this study. The structural, mechanical, and morphological properties of chitosan-based materials containing various amounts of lignin filler were investigated. The infra-red IR spectroscopy data confirmed the formation of chemical bonds between the components of the obtained composites. The mechanical properties of film samples were studied in air and in physiological solution. It was demonstrated that the breaking elongation values of the obtained film samples in the wet state were higher (150–160%) than the corresponding (average) value of a pure chitosan film (100%). The scanning electron microscopy and atomic force microscopy data demonstrated that the introduction of lignin had caused significant changes in the surface morphology of films. The appearance of a strongly pronounced texture and porosity facilitated cell proliferation on the surface of composites, i.e., the bioactivity of film samples was enhanced with an increasing lignin content in the chitosan matrix.

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Section: Preparation Of Filmsmentioning

confidence: 99%

Biocomposite Materials Based on Chitosan and Lignin: Preparation and Characterization

et al. 2021

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“…The majority of the mass spectra were obtained in the m/z range up to m/z 1000 19–23,26,37 or m/z 1500, 19,24,28,38,39 often with the main goal being to evaluate lignin degradation products 40–42 . However, the MW was mostly left undetermined, 19–24,26,28,37–39 although some studies mentioned the mass range in Daltons in addition to the m/z range, thus recognizing the formation of multiply charged species typical for ESI 15,24,27 . The mass range reported after a presumed deconvolution reached up to 2400, 4500 and 7000 Da 15,24,28 .…”

Section: Esi‐ms Analysis Of Ligninmentioning

confidence: 99%

Atmospheric pressure ionization mass spectrometry as a tool for structural characterization of lignin

Kubátová

Andrianova

Hatton

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale Lignin occurs in a broad range of forms, e.g., native as the main support for plant walls, and processed, for which its structure depends on the nature of the industrial isolation method, such as in paper production or in biorefineries. Due to the variety of lignin sources, there is no unified agreement on the structure of lignin or even its molecular weight (MW). Methods The focus of this review is on the application of atmospheric pressure ionization methods to lignin analysis by mass spectrometry (MS), namely electrospray ionization (ESI) or direct analysis in real‐time (DART). Specific parameters affecting ionization including electrolytes and solvents are discussed. Results The main challenge for MW determination of lignin is its heteropolymer character as well as the mass range limitations of MS instrumentation. To date, only a few studies have successfully used the mass range above m/z 1500. We present the advantage of ESI in generating multiply charged ions, allowing for a further increase in the mass range of deconvoluted mass spectra. While some methods such as DART do not address the mass range problem, they may serve as excellent imaging tools suitable for structural characterization of lignin. Conclusions A literature review presents the recent accomplishments in lignin MS analysis by atmospheric pressure ionization techniques. Although significant breakthroughs have been made, it is essential to further improve the operating conditions and validate the methods for a broader range of feedstocks with the results being confirmed using other methods.

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“…Extensive studies have been performed on the Physico-chemical modification of alkali lignin structure to increase its water solubility [10][11][12]. The chemical modification of lignin can be achieved by different approaches include reaction with epichlorohydrin, formaldehyde, phenol, propylene carbonate, polyethylene glycol [13][14][15]. Moreover, The modified lignin can be obtained by introducing cationic or anionic moieties to increase its solubility [16].…”

Section: Introductionmentioning

confidence: 99%

Valorization of bagasse alkali lignin to water-soluble derivatives through chemical modification

Abdulkhani

Khorasani

Hamzeh

et al. 2022

Biomass Conv. Bioref.

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Black liquor is the by-product of the pulping process where the lignin, hemicellulose, and extractive materials are separated from wood to produce paper pulp. As one of the primary lignin sources, black liquor is considered an important energy source from biomass to produce biofuels and value-added chemicals. However, soda alkaline lignin has limited industrial applications due to its insolubility in water and lack of reactivity. Therefore, chemical modification is essential to enhance its industrial applications. In this study, alkali lignin from bagasse was modified through sulfonation, sulfomethylation, and amination processes using different reaction conditions. The structural analysis of obtained products was investigated by FTIR and 1 H-NMR. The molecular weight distribution and thermal stability of the watersoluble products were analyzed using gel permeation chromatography (GPC) and thermogravimetric analysis (TGA), respectively. The elemental analysis was used to measure the elements (CHNSO) of the obtained water-soluble derivatives. The chemical structure analysis of the samples with FTIR and 1 HNMR confirmed the modification processes. The results indicate that modification led to increased water solubility and a decrease in the precipitation pH of lignin samples, due to the introduction of sulfonate and amin functunal groups on lignin. In addition, the molecular weight and thermal stability of modified lignins were increased due to the presence of sulfonate and amine groups compared to unmodified lignin.

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Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment

Cited by 10 publications

References 28 publications

Biocomposite Materials Based on Chitosan and Lignin: Preparation and Characterization

Biocomposite Materials Based on Chitosan and Lignin: Preparation and Characterization

Atmospheric pressure ionization mass spectrometry as a tool for structural characterization of lignin

Valorization of bagasse alkali lignin to water-soluble derivatives through chemical modification

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