Antimicrobial colloidal hydrogels assembled by graphene oxide and thermo-sensitive nanogels for cell encapsulation

Cheng, Wenhua; Chen, Yunhua; Teng, Lijing; Lu, Bingheng; Li, Ren; Wang, Yingjun

doi:10.1016/j.jcis.2017.11.018

Cited by 31 publications

(13 citation statements)

References 49 publications

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“…Nevertheless, a minimum survival rate of 73% is assured by the end of 72 h. Although a larger pore size was observed for the nanocomposite hydrogels, which would facilitate the proliferation and diffusion of nutrients from the medium to its interior, their lower mechanical performance may be detrimental for cell fixation and subsequent proliferation. Notably, the nanocomposite hydrogel cell proliferation allowed survival rate recovery [97][98][99][100]. Further analyses need to be planned to investigate in detail the antimicrobial activity of GO (free and cross-linked) in the range of studied concentrations.…”

Section: Cell Viability Assaysmentioning

confidence: 99%

Gelatin-Graphene Oxide Nanocomposite Hydrogels for Kluyveromyces lactis Encapsulation: Potential Applications in Probiotics and Bioreactor Packings

et al. 2021

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Nutraceutical formulations based on probiotic microorganisms have gained significant attention over the past decade due to their beneficial properties on human health. Yeasts offer some advantages over other probiotic organisms, such as immunomodulatory properties, anticancer effects and effective suppression of pathogens. However, one of the main challenges for their oral administration is ensuring that cell viability remains high enough for a sustained therapeutic effect while avoiding possible substrate inhibition issues as they transit through the gastrointestinal (GI) tract. Here, we propose addressing these issues using a probiotic yeast encapsulation strategy, Kluyveromyces lactis, based on gelatin hydrogels doubly cross-linked with graphene oxide (GO) and glutaraldehyde to form highly resistant nanocomposite encapsulates. GO was selected here as a reinforcement agent due to its unique properties, including superior solubility and dispersibility in water and other solvents, high biocompatibility, antimicrobial activity, and response to electrical fields in its reduced form. Finally, GO has been reported to enhance the mechanical properties of several materials, including natural and synthetic polymers and ceramics. The synthesized GO-gelatin nanocomposite hydrogels were characterized in morphological, swelling, mechanical, thermal, and rheological properties and their ability to maintain probiotic cell viability. The obtained nanocomposites exhibited larger pore sizes for successful cell entrapment and proliferation, tunable degradation rates, pH-dependent swelling ratio, and higher mechanical stability and integrity in simulated GI media and during bioreactor operation. These results encourage us to consider the application of the obtained nanocomposites to not only formulate high-performance nutraceuticals but to extend it to tissue engineering, bioadhesives, smart coatings, controlled release systems, and bioproduction of highly added value metabolites.

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Section: Cell Viability Assaysmentioning

confidence: 99%

Gelatin-Graphene Oxide Nanocomposite Hydrogels for Kluyveromyces lactis Encapsulation: Potential Applications in Probiotics and Bioreactor Packings

et al. 2021

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“…The reversible folding of this product is due to pH-dependent hydrogen bonds. The formulation has high antibacterial activity and possesses a good drug release ability [106].…”

Section: Antibacterial Propertiesmentioning

confidence: 99%

Graphenic Materials for Biomedical Applications

2019

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Graphene-based nanomaterials have been intensively studied for their properties, modifications, and application potential. Biomedical applications are one of the main directions of research in this field. This review summarizes the research results which were obtained in the last two years (2017-2019), especially those related to drug/gene/protein delivery systems and materials with antimicrobial properties. Due to the large number of studies in the area of carbon nanomaterials, attention here is focused only on 2D structures, i.e. graphene, graphene oxide, and reduced graphene oxide.

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“…[ 68 , 145 , 146 ] Contact limitation: Combining GFMs with other biomaterials significantly reduces direct contact between GFMs and cells. The final composite forms include 3D porous scaffold, [ 82 , 146 ] film, [ 147 , 148 ] hydrogel mass, [ 149 , 150 ] and so on. Reducing oxidation levels: The surface oxidation state is reported to be related to the toxicity of GO for mammalian cells.…”

Section: Discussionmentioning

confidence: 99%

Development of Graphene‐Based Materials in Bone Tissue Engineaering

et al. 2021

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Currently, general treatments of criticalsized bone defects include autografts, allografts, and the use of bone regeneration biomaterials. [1] Autograft is the gold standard approach due to its satisfying osteogenicity. But it also faces drawbacks such as an invasive surgical operation for bone harvest and scarcity of available donor sites. [2] Allograft is accompanied by the risk of disease transmission and immunological rejection. [2] Therefore, significant efforts have been devoted to finding alternative approaches for bone regeneration. Bone tissue engineering (BTE) provides a promising alternative strategy to realize higher-level restoration of bone defects. BTE exploits the elaborate combination of scaffolds, seeding cells, and biological factors to form a functional substitute or assist in situ regeneration. In most BTE research, stem cells are implanted into defective bone sites with the support of a biomaterial-based scaffold and are supposed to proliferate and differentiate into osteoblasts to promote bone regeneration. However, the performances of many current BTE systems could not meet the therapeutic expectation due to problems such as insufficient osteogenic differentiation and limited vascularization. [3][4][5] Many studies tried to improve the performance of BTE via enhancing the properties of the biomaterial-based scaffold. [6] In addition to traditional macroor microscale forms of metals, ceramics, and polymers, their nanoscale counterparts have been extensively explored for BTE due to their unique properties. [7][8][9][10] Ever since Andre Geim and Konstantin Novoselov [11] discovered a simple and feasible method for graphene isolation, graphene family materials (GFMs) have attracted great interest in regenerative medicine and tissue engineering. In BTE, bGBMs show promising potentials such as mechanical strength, high specific surface, and adsorption ability. [12][13][14][15][16][17] According to the composition, bGBMs could be categorized into GFMs and GFMs-containing composite materials (GCMs). GFMs refer to graphene and its derivatives, containing 0D graphene quantum dots (GQDs), 2D graphene (GR), graphene oxide (GO), and reduced graphene oxide (rGO), 3D graphite, etc. Among them, GQDs, GR, GO, and rGO could be obtained by chemical approaches using graphite as the starting material. GCMs are composite materials consisting of GFMs and other materials such Bone regeneration-related graphene-based materials (bGBMs) are increasingly attracting attention in tissue engineering due to their special physical and chemical properties. The purpose of this review is to quantitatively analyze mass academic literature in the field of bGBMs through scientometrics software CiteSpace, to demonstrate the rules and trends of bGBMs, thus to analyze and summarize the mechanisms behind the rules, and to provide clues for future research. First, the research status, hotspots, and frontiers of bGBMs are analyzed in an intuitively and vividly visualized way. Next, the extracted important subjects such as fabricatio...

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Antimicrobial colloidal hydrogels assembled by graphene oxide and thermo-sensitive nanogels for cell encapsulation

Cited by 31 publications

References 49 publications

Gelatin-Graphene Oxide Nanocomposite Hydrogels for Kluyveromyces lactis Encapsulation: Potential Applications in Probiotics and Bioreactor Packings

Gelatin-Graphene Oxide Nanocomposite Hydrogels for Kluyveromyces lactis Encapsulation: Potential Applications in Probiotics and Bioreactor Packings

Graphenic Materials for Biomedical Applications

Development of Graphene‐Based Materials in Bone Tissue Engineaering

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