Enhanced mechanical performance of biocompatible hemicelluloses-based hydrogel via chain extension

Qi, Xin; Chen, Gegu; Gong, Xiaodong; Fu, Gen-Que; Niu, Ya-Shuai; Bian, Jing; Peng, Feng; Sun, Run‐Cang

doi:10.1038/srep33603

Cited by 27 publications

(8 citation statements)

References 46 publications

(47 reference statements)

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“…All of the hydrogels demonstrated strain tolerances of over 44%, as seen in Figure 10. The curves were not linear but followed an exponential increase, demonstrating the softness of the gels [40]. The maximum ultimate tensile strength (UTS) for these hydrogels was 21 kPa, which is in the same range as for other pure hemicellulose hydrogels [41].…”

Section: Resultsmentioning

confidence: 99%

“…This finding was not apparent from the results because the strain also increased with the addition of ECH. However, the compression modulus—the ratio between compression stress and strain—rose with the addition of ECH; thus, the stiffness of the hydrogels increased [40]. The opposite effect was observed with higher lignin content (Figure 10b).…”

Section: Resultsmentioning

confidence: 99%

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Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

et al. 2018

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Hemicellulose is a promising renewable raw material for the production of hydrogels. This polysaccharide exists in large amounts in various waste streams, in which they are usually impure and heavily diluted. Several downstream processing methods can be combined to concentrate and purify the hemicellulose. However, such an approach can be costly; hence, the effect of impurities on the formation and properties of hydrogels must be determined. Lignin usually exists in these waste streams as a major impurity that is also difficult to separate. This compound can darken hydrogels and decrease their swellability and reactivity, as shown in many studies. Other properties and effects of lignin impurities are equally important for the end application of hydrogels and the overall process economy. In this work, we examined the feasibility of producing hydrogels from hemicelluloses that originated from sodium-based spent sulfite liquor. A combination of membrane filtration and anti-solvent precipitation was used to extract and purify various components. The influence of the purity of hemicellulose and the addition of lignosulfonates (emulated impurities in the downstream processing) to the crosslinking reaction mixture on the mechanical, thermal, and chemical properties of hydrogels was determined.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

et al. 2018

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“…polymers, gels or binders, other evaluation criteria must be employed. These can include mechanical strength and swelling properties of the polymers [39, 40]. Regarding lignin, its reactivity can be an appropriate indicator [41].…”

Section: Biomassmentioning

confidence: 99%

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Galbe

Wallberg

2019

Biotechnol Biofuels

339

195

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The implementation of biorefineries based on lignocellulosic materials as an alternative to fossil-based refineries calls for efficient methods for fractionation and recovery of the products. The focus for the biorefinery concept for utilisation of biomass has shifted, from design of more or less energy-driven biorefineries, to much more versatile facilities where chemicals and energy carriers can be produced. The sugar-based biorefinery platform requires pretreatment of lignocellulosic materials, which can be very recalcitrant, to improve further processing through enzymatic hydrolysis, and for other downstream unit operations. This review summarises the development in the field of pretreatment (and to some extent, of fractionation) of various lignocellulosic materials. The number of publications indicates that biomass pretreatment plays a very important role for the biorefinery concept to be realised in full scale. The traditional pretreatment methods, for example, steam pretreatment (explosion), organosolv and hydrothermal treatment are covered in the review. In addition, the rapidly increasing interest for chemical treatment employing ionic liquids and deep-eutectic solvents are discussed and reviewed. It can be concluded that the huge variation of lignocellulosic materials makes it difficult to find a general process design for a biorefinery. Therefore, it is difficult to define "the best pretreatment" method. In the end, this depends on the proposed application, and any recommendation of a suitable pretreatment method must be based on a thorough techno-economic evaluation.

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“…Gelation can be induced by chemical, enzymatic or physical crosslinking. Chemical cross-linking involves the introduction of permanent linkages by means of a cross-linking agent; for example, glyoxal(dialdehyde), glutaraldehyde (GTA), butane tetracarboxylic acid and citric acid [ 13 , 14 ]. On the other hand, physical cross-linking is characterized by hydrogen bonding, Van der Waals forces, or electrostatic interactions [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Polysaccharide-Based Aerogel Production for Biomedical Applications: A Comparative Review

2021

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A comparative analysis concerning bio-based gels production, to be used for tissue regeneration, has been performed in this review. These gels are generally applied as scaffolds in the biomedical field, thanks to their morphology, low cytotoxicity, and high biocompatibility. Focusing on the time interval 2015–2020, the production of 3D scaffolds of alginate, chitosan and agarose, for skin and bone regeneration, has mainly been investigated. Traditional techniques are critically reviewed to understand their limitations and how supercritical CO2-assisted processes could overcome these drawbacks. In particular, even if freeze-drying represents the most widespread drying technique used to produce polysaccharide-based cryogels, supercritical CO2-assisted drying effectively allows preservation of the nanoporous aerogel structure and removes the organic solvent used for gel preparation. These characteristics are essential for cell adhesion and proliferation.

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Enhanced mechanical performance of biocompatible hemicelluloses-based hydrogel via chain extension

Cited by 27 publications

References 46 publications

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Polysaccharide-Based Aerogel Production for Biomedical Applications: A Comparative Review

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