Influence of crosslinking agent on the morphology, chemical, crystallinity and thermal properties of cellulose nanofiber using steam explosion

Saragih, Sri Wahyuna; Wirjosentono, Basuki; Eddiyanto,; Meliana, Yenny

doi:10.1016/j.csite.2020.100740

Cited by 18 publications

(8 citation statements)

References 39 publications

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“…Then, the nanofiber was dried at 100 °C and weighed again ( W u ). The degree of cross-linking was calculated using the following equation , …”

Section: Methodsmentioning

confidence: 99%

“…Then, the nanofiber was dried at 100 °C and weighed again ( W u ). The degree of cross-linking was calculated using the following equation , normald normale normalg normalr normale normale .25em normalo normalf .25em normalc normalr normalo normals normals − normall normali normaln normalk normali normaln normalg .25em ( % ) = W normalu W normald × 100 …”

Section: Methodsmentioning

confidence: 99%

“…Then, the nanofiber was dried at 100 °C and weighed again (W u ). The degree of cross-linking was calculated using the following equation 23,24 (4) Surface Charge of the Scaffold. The surface charge of PVA− HA−CS cross-linked nanofibers at different pHs was investigated through the modified ζ potential methodology.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Cross-Linked Electrospun pH-Sensitive Nanofibers Adsorbed with Temporin-Ra for Promoting Wound Healing

Koohzad

Asoodeh

2023

ACS Appl. Mater. Interfaces

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Bioresponsive nanodrug delivery systems have excellent potential in tissue engineering applications. Poly-anionic and poly-cationic biopolymers have provided a superior platform for designing pH-sensitive drug delivery systems. In this regard, hyaluronic acid–chitosan–polyvinyl alcohol complex nanofibers with high quality and reproducibility were produced by optimizing the solution preparation process. In addition, the synthesized composite nanofiber, with 66.82 kN/mm toughness, 200% swelling ratio, and 60% porosity, exhibited excellent properties to meet the requirements of the ideal wound dressing. Green cross-linking with citric acid prevented the destruction of the nanofiber even after prolonged immersion in biological solutions. ζ potential studies demonstrated that the synthesized nanofiber has a negative surface charge (∼−30) at physiological pH. The pK a of the temporin-Ra peptide is about 10, and as a result the peptide molecules have a net positive charge in physiological conditions. Therefore, peptide molecules immobilized on the synthesized scaffold based on surface adsorption. In vivo evaluation has proven that the wound bed has an alkaline environment, facilitating peptide release from the nanofiber scaffold. Electrospun nanofibers can imitate the architecture of the extracellular matrix for accelerating wound healing. In vitro investigation showed better adhesion, proliferation, migration, and fibroblast cell growth on peptide-loaded nanofiber samples than other groups. In vivo studies on full-thickness wounds in the mouse model indicated that the designed nanofiber was gradually absorbed without causing dryness or infection. On day 6, the peptide-loaded nanofiber revealed 60% wound closure compared to the control group (17%). In addition, based on histological studies, the composite nanofiber demonstrated excellent tissue repair ability, hence these active nanofiber mats can be a good alternative to existing wound dressings. Gene expression studies show that the antimicrobial peptide promotes the inflammatory phase of wound healing in a shorter time frame by accelerating the tumor necrosis factor-α cytokine response.

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“…Then, the nanofiber was dried at 100 °C and weighed again ( W u ). The degree of cross-linking was calculated using the following equation , …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Cross-Linked Electrospun pH-Sensitive Nanofibers Adsorbed with Temporin-Ra for Promoting Wound Healing

Koohzad

Asoodeh

2023

ACS Appl. Mater. Interfaces

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“…According to the results, HCG demonstrated greater crystallinity compared to the hydrogel with fertilizer. The reduction in crystallinity may be a consequence of the increase in crosslinking network and a possible distortion in the polymeric network, due to the presence of PHP [50,51]. The functional groups present in the materials were investigated by FTIR analysis, and these results are shown in Figure 1b.…”

Section: Structural and Morphological Characterizationmentioning

confidence: 99%

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

et al. 2021

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Agricultural production is influenced by the water content in the soil and availability of fertilizers. Thus, superabsorbent hydrogels, based on polyacrylamide, natural cashew tree gum (CG) and potassium hydrogen phosphate (PHP), as fertilizer and water releaser were developed. The structure, morphology, thermal stability and chemical composition of samples of polyacrylamide and cashew tree gum hydrogels with the presence of fertilizer (HCGP) and without fertilizer (HCG) were investigated, using X-ray diffractometry (XRD), Fourier Transformed Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA/DTG) and Energy Dispersive Spectroscopy (EDS). Swelling/reswelling tests, textural analysis, effect of pH, release of nutrients and kinetics were determined; the ecotoxicity of the hydrogels was investigated by the Artemia salina test. The results showed that PHP incorporation in the hydrogel favored the crosslinking of chains. This increased the thermal stability in HCGP but decreased the hardness and adhesion properties. The HCGP demonstrated good swelling capacity (~15,000 times) and an excellent potential for reuse after fifty-five consecutive cycles. The swelling was favored in an alkaline pH due to the ionization of hydrophilic groups. The sustained release of phosphorus in HCGP was described by the Korsmeyer–Peppas model, and Fickian diffusion is the main fertilizer release mechanism. Finally, the hydrogels do not demonstrate toxicity, and HCGP has potential for application in agriculture.

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“…Several bleaching agents are available in the market, such as alkaline peroxide, sodium hypochlorite, and sodium chlorite, which are separated by filtration to obtain holocellulose, which is a raw material used for CNF. Hollocellulose can be directly processed to obtain CNF by using the grinding treatment [55,[69][70][71], high-pressure homogenization [57,[72][73][74], acid hydrolysis [54,56], enzymatic hydrolysis [41,75], and ultrasonication [67,76,77]. The second route is the bleaching process followed by TEMPO-mediated oxidation to isolate the CNF [68].…”

Section: Cnfmentioning

confidence: 99%

Biorefinery System of Lignocellulosic Biomass Using Steam Explosion

Asada¹,

Sholahuddin²,

Nakamura³

2021

Cellulose Science and Derivatives

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Recently, plant biomass has been attracting attention due to global warming and the depletion of fossil fuels. Lignocellulosic biomass (i.e., wood, straw, and bagasse) is attracting attention as an abundant renewable resource that does not compete with the food resources. It is composed of cellulose, hemicellulose, and lignin and is a potential resource that can be converted into high-value-added substances, such as biofuels, raw materials for chemical products, and cellulose nanofibers. However, due to its complicated structure, an appropriate pretreatment method is required for developing its biorefinery process. Steam explosion is one of the simplest and environmentally friendly pretreatments to decompose lignin structure, which converts cellulose into low-molecular-weight lignin with high efficiency. It has received significant attention in the field of not only biofuel but also biochemical production. Steam explosion involves the hydrolysis of plant biomass under high-pressure steam and the sudden release of steam pressure induces a shear force on the plant biomass. Moreover, it is a green technology that does not use any chemicals. Thus, a steam explosion-based biorefinery system is highly effective for the utilization of lignocellulosic into useful materials, such as ethanol, methane gas, antioxidant material, epoxy resin, and cellulose nanofiber.

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Influence of crosslinking agent on the morphology, chemical, crystallinity and thermal properties of cellulose nanofiber using steam explosion

Cited by 18 publications

References 39 publications

Cross-Linked Electrospun pH-Sensitive Nanofibers Adsorbed with Temporin-Ra for Promoting Wound Healing

Cross-Linked Electrospun pH-Sensitive Nanofibers Adsorbed with Temporin-Ra for Promoting Wound Healing

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

Biorefinery System of Lignocellulosic Biomass Using Steam Explosion

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