Preparation and Application of Phosphorylated Xylan as a Flocculant for Cationic Ethyl Violet Dye

Li, Zhong‐Ming; Xu, Dingding; Xia, Nannan; Zhao, Xin; Kong, Fangong; Wang, Shoujuan; Fatehi, Pedram

doi:10.3390/polym10030317

Cited by 20 publications

(13 citation statements)

References 46 publications

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“…The drop in the charge density at a higher reagent/chitosan ratio could be due to the progress in the formation of homopolymers of PMETMS and PMETAC (Figure 1b). 60,61 A similar trend was reported for the polymerization of xylan and METMS. 62…”

Section: Results and Discussionsupporting

confidence: 80%

Impact of Counter Ions of Cationic Monomers on the Production and Characteristics of Chitosan-Based Hydrogel

2019

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Chitosan-based hydrogel has received considerable interests because of its appealing properties and applications in many areas. The primary objective of this work was to produce novel cationic chitosan-based hydrogels via polymerizing chitosan with two cationic monomers of the same structure but with different counter ions [2-(methacryloyloxy)ethyl]trimethylammonium methyl sulfate (METMS) and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC). Polymerization of chitosan with the cationic monomers performed under the conditions of 50 °C, 5 h, 7 pH, and 2/1 mol/mol monomer/chitosan led to chitosan–METMS and −METAC with the cationic charge densities of 3.22 and 2.88 mequiv/g, respectively. Elemental analysis, gel permeation chromatography, Fourier transform infrared, X-ray diffraction, and differential scanning calorimetry analyses were used to confirm the impact of counter ions of cationic monomers (i.e., polarizability of monomers) on their polymerization performance and the characteristics of induced chitosan-based hydrogels. Also, the results of this work postulated that the counter ions associated with the monomers could dramatically impact the water uptake and swelling properties of the generated chitosan-based hydrogels as well as their performance in adsorbing an anionic dye from a simulated solution.

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Section: Results and Discussionsupporting

confidence: 80%

Impact of Counter Ions of Cationic Monomers on the Production and Characteristics of Chitosan-Based Hydrogel

2019

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“…The concentrations of xylose and XOS in PHL after purification can be increased by subsequent acid/enzymatic hydrolysis [37,38]. For the proposed process, the removal of contaminants (lignin, furfural) and the purification of hemicellulose in PHL can enhance the hemicellulose hydrolyzates obtained from the proposed process to prepare the value-added products (e.g., XOS DP2~6 , bioethanol, xylitol, additives, dietary supplements, and chemicals) in the subsequent biorefinery process [2,7,17,39,40,41,42].…”

Section: Resultsmentioning

confidence: 99%

Combined Treatments Consisting of Calcium Hydroxide and Activate Carbon for Purification of Xylo-Oligosaccharides of Pre-Hydrolysis Liquor

Chen

Yang

et al. 2019

Polymers

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In this study, the effect of a combined treatment consisting of calcium hydroxide (CH) followed by activated carbon (AC) on the purification of hemicellulose in the pre-hydrolysis liquor (PHL) from pulping process has been evaluated. The results show that lignin and furfural of PHL are efficiently removed, and the lignin removal is achieved by forming complexes onto CH particles in the CH treatment process, while acetic acid (acetate) is formed from the hydrolysis of acetyl groups present in the dissolved hemicelluloses in the PHL. The loss of xylo-oligosaccharides (XOS) is moderate, even at a high CH dosage of 0.8% while the xylose concentration is essentially unchanged. For the AC treatment, the optimal treating pH can enhance the interactions between AC and residual lignin and change the zeta potential of AC resulting in improved lignin adsorption onto AC. An increase of AC dosage has the tendency to adsorb more XOSDP>6 than XOSDP2~6. Overall, 66.9% of lignin and 70.1% of furfural removals are achieved under the optimal conditions of CH and AC treatment process, with a 5.9% total xylosugars loss. The present combination of CH and AC treatment process was more effective and selective for purification of xylosugars of PHL.

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“…These bands are characteristic of the polymer crosslinking by STMP. [ 37–39 ] These bands became weaker as the crosslinked density decreased. As can be seen from the Figure S2 (Supporting Information), the OPO stretching band at 1272 cm −1 and PO bending band at 1020 cm −1 are visible with Bioscaffold‐A and Bioscaffold‐B and it is faintly visible in Bioscaffold‐C.…”

Section: Figurementioning

confidence: 99%

3D‐Bioprinted Inflammation Modulating Polymer Scaffolds for Soft Tissue Repair

et al. 2020

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creates a defect that intra-abdominal contents may protrude through. [1] The most common types of hernias are incisional, inguinal, femoral, umbilical and hiatal hernias. [2] Hernia repair for many defects is performed by the surgical implantation of a prosthetic mesh to firmly support and reinforce the damaged abdominal wall and facilitate the healing process (Figure 1A,B). Each year, over 400 000 incisional hernia repair surgeries are performed with a cost of ≈$15 billion in US healthcare expenditures. [3-5] Prosthetic hernia mesh implants are developed using synthetic, biologic, and coated materials. [6,7] Despite their specific advantages, these mesh implants are not very effective in minimizing potential adverse postsurgical complications. [8] Surgical hernia repair with mesh implants mostly fail due to the formation of visceral adhesions, hardening, and shrinking of the mesh after its implantation. Visceral adhesions are fibrous tissues developed from the underlying serosal membrane of stomach, intestine or colon, that attach to the implanted mesh. [9] These adhesions are mainly composed of collagen and fibroblasts that grow on the mesh and adhere to the nearby tissue, nerves and organs. [10] The mesh shrinks as the adhesions grow and scar tissue hardens, thus forming a hard, fibrous mass that may cause chronic pain, bowel obstruction, enteric fistula, infertility, poor quality of life, and failure of the surgical hernia repair. [11-13] To remove the failed hernia mesh, a complicated surgery needs to be performed, wherein the mesh must be peeled off bladder, stomach, intestine, colon, or a major blood vessel, that may adversely affect the clinical outcomes. [14] To minimize adhesions formation, graft contraction, and foreign body reactions, absorbable and biological meshes have been developed. However, these meshes are not significantly effective because of very high hernia recurrence rates. [15-17] Causative factors for adverse complications arising due to surgical mesh implantation are chronic inflammatory responses, poor mesh-tissue integration, rapid degradation of the materials, surface chemistry and topochemical design of the mesh. [18,19] We herein present the development of an intrinsically inflammation modulating 3D-fabricated biomaterial scaffold (bioscaffold) for soft tissue repair and demonstrate its in vivo efficacy in a rat ventral hernia Development of inflammation modulating polymer scaffolds for soft tissue repair with minimal postsurgical complications is a compelling clinical need. However, the current standard of care soft tissue repair meshes for hernia repair is highly inflammatory and initiates a dysregulated inflammatory process causing visceral adhesions and postsurgical complications. Herein, the development of an inflammation modulating biomaterial scaffold (bioscaffold) for soft tissue repair is presented. The bioscaffold design is based on the idea that, if the excess proinflammatory cytokines are sequestered from the site of injury by the surgical implantation of a bioscaffold,...

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Preparation and Application of Phosphorylated Xylan as a Flocculant for Cationic Ethyl Violet Dye

Cited by 20 publications

References 46 publications

Impact of Counter Ions of Cationic Monomers on the Production and Characteristics of Chitosan-Based Hydrogel

Impact of Counter Ions of Cationic Monomers on the Production and Characteristics of Chitosan-Based Hydrogel

Combined Treatments Consisting of Calcium Hydroxide and Activate Carbon for Purification of Xylo-Oligosaccharides of Pre-Hydrolysis Liquor

3D‐Bioprinted Inflammation Modulating Polymer Scaffolds for Soft Tissue Repair

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