Modification of chemical reactivity of enzymatic hydrolysis lignin by ultrasound treatment in dilute alkaline solutions

Ma, Zhuoming; Li, Shujun; Gui-zhen, Fang; Patil, Nikhil D.; Yan, Ning

doi:10.1016/j.ijbiomac.2016.09.095

Cited by 31 publications

(19 citation statements)

References 37 publications

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“…It was noted that the content of C 1 subpeak at 284.7 eV was decreased by additives, with a simultaneous increase in C 2 subpeak at 286.6 eV (Table 4 ). This was probably because these additives suppressed the lignin repolymerization reactions, reducing the C–C bonds while enhancing the C–O–C linkages [ 37 ]. Moreover, XPS results indicated that functional groups were effectively incorporated to lignin, e.g., the sulfonic groups of 2-naphthol-7-sulfonate and hydroxyl groups of mannitol, which largely increased the content of C–S or C–OH in C 2 subpeak.…”

Section: Resultsmentioning

confidence: 99%

“…It was suggested the suppression of lignin repolymerization, in combination with the introduction of hydrophilic functional groups, decreased the hydrophobic property of fiber surface, as evidenced by reduced C 1 /C 2 ratio [ 38 ]. In addition, the phenolic oxygen (PhOH), attributed to O 3 with a binding energy of ~ 533.3 eV [ 37 ], was reduced by these additives (Table 4 ), which could diminish the hydrogen bonding between lignin and cellulase enzymes [ 17 ]. Both the decreased surface hydrophobicity and the reduced PhOH content of surface lignin had the potential to alleviate the unproductive binding of cellulase enzymes to surface lignin, thereby diminishing the surface barrier effect of lignin (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Organosolv pretreatment assisted by carbocation scavenger to mitigate surface barrier effect of lignin for improving biomass saccharification and utilization

Chu

Tong

Chen

et al. 2021

Biotechnol Biofuels

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Background Ethanol organosolv (EOS) pretreatment is one of the most efficient methods for boosting biomass saccharification as it can achieve an efficient fractionation of three major constituents in lignocellulose. However, lignin repolymerization often occurs in acid EOS pretreatment, which impairs subsequent enzymatic hydrolysis. This study investigated acid EOS pretreatment assisted by carbocation scavenger (2-naphthol, 2-naphthol-7-sulfonate, mannitol and syringic acid) to improve biomass fractionation, coproduction of fermentable sugars and lignin adsorbents. In addition, surface barrier effect of lignin on cellulose hydrolysis was isolated from unproductive binding effect of lignin, and the analyses of surface chemistry, surface morphology and surface area were carried out to reveal the lignin inhibition mitigating effect of various additives. Results Four different additives all helped mitigate lignin inhibition on cellulose hydrolysis in particular diminishing surface barrier effect, among which 2-naphthol-7-sulfonate showed the best performance in improving pretreatment efficacy, while mannitol and syringic acid could serve as novel green additives. Through the addition of 2-naphthol-7-sulfonate, selective lignin removal was increased up to 76%, while cellulose hydrolysis yield was improved by 85%. As a result, 35.78 kg cellulose and 16.63 kg hemicellulose from 100 kg poplar could be released and recovered as fermentable sugars, corresponding to a sugar yield of 78%. Moreover, 22.56 kg ethanol organosolv lignin and 17.53 kg enzymatic hydrolysis residue could be recovered as lignin adsorbents for textile dye removal, with the adsorption capacities of 45.87 and 103.09 mg g−1, respectively. Conclusions Results in this work indicated proper additives could give rise to the form of less repolymerized surface lignin, which would decrease the unproductive binding of cellulase enzymes to surface lignin. Besides, the supplementation of additives (NS, MT and SA) resulted in a simultaneously increased surface area and decreased lignin coverage. All these factors contributed to the diminished surface barrier effect of lignin, thereby improving the ease of enzymatic hydrolysis of cellulose. The biorefinery process based on acidic EOS pretreatment assisted by carbocation scavenger was proved to enable the coproduction of fermentable sugars and lignin adsorbents, allowing the holistic utilization of lignocellulosic biomass for a sustainable biorefinery. Graphic abstract

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Organosolv pretreatment assisted by carbocation scavenger to mitigate surface barrier effect of lignin for improving biomass saccharification and utilization

Chu

Tong

Chen

et al. 2021

Biotechnol Biofuels

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“…To improve the reactivity of lignin with isocyanates and the compatibility of lignin with PU substrates, and to promote the formation of intermolecular covalent bonds between lignin and the PU matrix, 19 techniques for the degradation and modification of lignin materials were developed 20,21 . Zhang et al 22 .…”

Section: Introductionmentioning

confidence: 99%

Production of polyurethane elastomer from highly reactive acetic acid lignin‐derived polyols with reduced molecular weights

Zhu

Liu

et al. 2021

Biofuels Bioprod Bioref

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Highly reactive polyols were prepared from modified acetic acid lignin (AAL) by a two‐step combination of mild hydrothermal degradation and hydroxylation. The AAL‐based polyols became relatively reactive and compatible with diisocyanate, with a reduction in the number average molecular weight (Mn) from 2923 to 684 g/mol and an increase in the hydroxyl content from 5.21 to 9.13 mmol/g. The mechanical performance and thermal properties of the AAL‐based polyurethane elastomers (LPUEs) strongly depended on the molecular weight and hydroxyl content of the AAL‐based polyols in the partial substitution of polytetramethylethylene ether glycol (PTMEG). This study proposed the prospective utilization of AAL as an alternative resource in the synthesis of polymers and biomaterials. © 2021 Society of Industrial Chemistry and John Wiley & Sons Ltd.

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“…As global environmental issues have become more serious, environmentally friendly and biodegradable materials have been increasingly sought and accepted by modern society. Dust prevention and control are no exceptions in this area (Ma et al., 2016) and although a variety of natural, degradable materials such as lignin, starch, and protein exist, they cannot be used directly as these natural polymers tend to have irregular structures and undesirable properties. Therefore, it is important to address the reconstruction of their structures through modification and subsequently make them widely usable (Gordobil et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Currently, graft copolymerization is a simple but effective chemical modification method for enhancing and modifying molecular structures and functions (Ma et al., 2016; Sirirat et al., 2015), as the active functional groups in natural polymers can provide favorable reaction preconditions. In the presence of initiators, the graft copolymerization reaction can occur subject to the appropriate selection of grafting monomers.…”

Section: Introductionmentioning

confidence: 99%

The development and characterization of a novel coagulant for dust suppression in open-cast coal mines

Zhou

Fan

et al. 2017

Adsorption Science & Technology

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This paper proposes the development of a novel coagulant for dust suppression in open-cast mines. Specifically, pretreated sodium lignin sulfonate and acrylic acid were first cross-linked, then the graft copolymerization of the intermediate product (the cross-linking product) and acrylamide was conducted and finally the resulting gelatinous substances were crushed. During the reaction process, N,N'-methylene-bis-acrylamide and ammonium persulfate were used as the cross-linking agent and initiator, respectively. Subsequently, the functional groups, crystalline structure, and thermal stability of the dust coagulant were examined by means of Fourier transform infrared spectra measurements, X-ray diffraction spectra measurements, and differential scanning calorimeter analysis. Moreover, single-factor experiments were conducted to explore the optimal synthesis condition. According to the experimental results, the coagulant achieved its optimal dust suppression performance under the following conditions: the mass ratio of lignin to acrylic acid was 1:3, the mass ratio of lignin to acrylamide was 2:7, the content of the cross-linking agent was 0.9%, the mass ratio of initiator to acrylamide was 2:100, the reaction temperature was set as 60 C, and the pH value was set as 7. Finally, the coagulant was measured for its swelling kinetics, viscosity, film-forming hardness, peeling strength, and ability to suppress dust. It can be concluded that the coagulant exhibits a very high standard of both dust suppression and wind resistance.

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Modification of chemical reactivity of enzymatic hydrolysis lignin by ultrasound treatment in dilute alkaline solutions

Cited by 31 publications

References 37 publications

Organosolv pretreatment assisted by carbocation scavenger to mitigate surface barrier effect of lignin for improving biomass saccharification and utilization

Organosolv pretreatment assisted by carbocation scavenger to mitigate surface barrier effect of lignin for improving biomass saccharification and utilization

Production of polyurethane elastomer from highly reactive acetic acid lignin‐derived polyols with reduced molecular weights

The development and characterization of a novel coagulant for dust suppression in open-cast coal mines

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