Effect of cellulose size-concentration on the structure of polyvinyl alcohol hydrogels

Lima, Gabriel Goetten de; Ferreira, Bruno Dias; Matos, Mailson; Pereira, Bruno Leandro; Nugent, Michael; Hansel, F. A.; Magalhães, Washington Luiz Esteves

doi:10.1016/j.carbpol.2020.116612

Cited by 57 publications

(51 citation statements)

References 36 publications

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“…It is already known that films produced with microfibrillated cellulose are very strong from previous tensile tests [11,20] (Fig. 5.a), while also able to increase this property when incorporated into many materials, such as chitosan films [40], at the expense of becoming less flexible and more brittle.…”

Section: Mechanical Properties and Antioxidant Analysismentioning

confidence: 91%

“…The procedure follows the one described before [20]. First, bleached kraft pulp was adjusted to 3 wt%/v (3 g/100 ml) using either distilled water, or the previously chitosan solution of 1% in acetic acid as the solution, and was further fragmented using a 450 W blender for 10 min.…”

Section: Microfibrillated Cellulose Gelmentioning

confidence: 99%

“…The thermo profile shows that the addition of chitosan to the MFC film results in one endothermic peak between 50-125°C due to the evaporation of water due to physical changes during N-deacetylation and carboxymethylation [34]. The second event is a large exothermic peak related to the degradation of chitosan material 230-350°C [35], finally within 300-400°C is the degradation of MFC components-cellulose degradation of glycosyl units and oxidation breakdown, forming low molecular weight products [20].…”

Section: Thermal Characterisationmentioning

confidence: 99%

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Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications

Aliabadi

Chee

Matos

et al. 2021

J Mater Sci: Mater Med

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The effectiveness of tannic acid as antimicrobial and wound healing for burns have been shown for a century; however, uncontrolled target dosage may result in undesirable side-effects. Remarkably, tannic acid polyphenols compounds crosslinked with polymeric materials produce a strong composite containing the beneficial properties of this tannin. However, investigation of the crosslink structure and its antibacterial and regenerative properties are still unknown when using nanocellulose by mechanical defibrillation; additionally, due to the potential crosslink structure with chitosan, its structure can be complex. Therefore, this work uses bleach kraft nanocellulose in order to investigate the effect on the physical and regenerative properties when incorporated with chitosan and tannic acid. This film results in increased rigidity with a lamellar structure when incorporated with tannic acid due to its strong hydrogen bonding. The release of tannic acid varied depending on the structure it was synthesised with, whereas with chitosan it presented good release model compared to pure cellulose. In addition, exhibiting similar thermal stability as pure cellulose films with antibacterial properties tested against S. aureus and E. coli with good metabolic cellular viability while also inhibiting NF-κB activity, a characteristic of tannic acid.

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Section: Mechanical Properties and Antioxidant Analysismentioning

confidence: 91%

Section: Microfibrillated Cellulose Gelmentioning

confidence: 99%

Section: Thermal Characterisationmentioning

confidence: 99%

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Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications

Aliabadi

Chee

Matos

et al. 2021

J Mater Sci: Mater Med

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“…where DH f is the melting enthalpy and DH 0 f refers to the melting enthalpy of a fully crystalline polymer (for PVA 138.60 J g À1 ). 46…”

Section: Thermal Propertiesmentioning

confidence: 99%

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

et al. 2021

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“…In addition to its good adhesion and moisture retention [10], with a similar healing rate compared to bacterial cellulose films [5], but actually presenting a better interaction within the wound [10]. The mechanical defibrillation that occurs from an ultrafine grinding machine enables the incorporation of different compounds during defibrillation [14]. This process heavily affects the interaction between the nanofibrils and the added compounds [12,14].…”

Section: Introductionmentioning

confidence: 99%

Yerba Mate Extract in Microfibrillated Cellulose and Corn Starch Films as a Potential Wound Healing Bandage

et al. 2020

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Microfibrillated cellulose films have been gathering considerable attention due to their high mechanical properties and cheap cost. Additionally, it is possible to include compounds within the fibrillated structure in order to confer desirable properties. Ilex paraguariensis A. St.-Hil, yerba mate leaf extract has been reported to possess a high quantity of caffeoylquinic acids that may be beneficial for other applications instead of its conventional use as a hot beverage. Therefore, we investigate the effect of blending yerba mate extract during and after defibrillation of Eucalyptus sp. bleached kraft paper by ultrafine grinding. Blending the extract during defibrillation increased the mechanical and thermal properties, besides being able to use the whole extract. Afterwards, this material was also investigated with high content loadings of starch and glycerine. The results present that yerba mate extract increases film resistance, and the defibrillated cellulose is able to protect the bioactive compounds from the extract. Additionally, the films present antibacterial activity against two known pathogens S. aureus and E. coli, with high antioxidant activity and increased cell proliferation. This was attributed to the bioactive compounds that presented faster in vitro wound healing, suggesting that microfibrillated cellulose (MFC) films containing extract of yerba mate can be a potential alternative as wound healing bandages.

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Effect of cellulose size-concentration on the structure of polyvinyl alcohol hydrogels

Cited by 57 publications

References 36 publications

Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications

Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

Yerba Mate Extract in Microfibrillated Cellulose and Corn Starch Films as a Potential Wound Healing Bandage

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