Chitosan Nanofibers Research Articles

Functional and biological characterization of chitosan electrospun nanofibrous membrane nucleated with silver nanoparticles

The electrospinning of chitosan nanofibers comprises some issues to produce uniform fibers and avoid their damage. To overcome some of these difficulties, the current research aimed to fabricate a chitosan electrospun nanofibrous membrane and provide material neutralization with 1 M NaOH, evaluate the antibacterial activity and cytotoxicity of treated chitosan nanofibers depending on different concentration of silver nanoparticles (AgNPs). The chitosan nanofibrous membranes were fabricated on an aluminum foil-covered collector of the electrospinning system. The silver nanoparticles (AgNPs) were produced by wet chemical method and incorporated into the Ch-TFA/DMC blend solution. The effect of TFA and DMC blend ratio and processing parameters on nanofibers and AgNPs distribution structure were examined by scanning electron microscopy with EDX. The swelling degree and weight loss capacity were evaluated before and after alkali treatment. Biocompatibility with U2OS cell and antibacterial assay with S. aureus and E. coli were used to assess biological properties. TFA/DCM chitosan membranes' neutralization in 1 M NaOH solution preserves the porous structure and provides insolubility in neutral or basic media. Post-neutralized chitosan nanofibrous membranes demonstrate high biocompatibility and provide the appropriate environment for cell proliferation. AgNPs did not affect biocompatibility but manifest an antibacterial effect against Gram-negative and Gram-positive bacteria.

Therapeutic potential of Commiphora molmol extract loaded on chitosan nanofibers against experimental cryptosporidiosis

ABSTRACT Background: Cryptosporidium is a life-threatening intestinal pathogen in immunocompromised patients. Currently, there is no entirely successful drug against cryptosporidiosis. Several reports utilizing nanotechnology combined with herbal medicine were published to evaluate its efficacy in treatment of intestinal pathogens. Objectives: To evaluate the anti-cryptosporidial efficacy of Commiphora molmol extract and its conjugation with chitosan nanofibers (CsNFs) for treatment of cryptosporidiosis in mice. Material and Methods: Sixty five male albino mice were infected orally with 1×104 Cryptosporidium oocysts. They were grouped and treated with nanazoxid (NTZ) (100 mg/kg), C. molmol extract (500 mg/kg), and C. molmol loaded chitosan nanofibers (Cm-CsNFs) at 25, 50, and 100 mg/kg. The scarification of mice was done after 5 and 10 days of treatments. Assessment of the treatments' efficacy was achieved through the study of the parasitological and pathological investigations. Results: C. molmol extract and Cm-CsNFs (100 mg/kg) significantly reduced the mean number of intestinal oocysts. All the treatment regimens significantly (P<0.05) diminished the mean number of trophozoites relative to the infected non-treated group. Apparent pathological alterations in intestinal tissues were consistent with cryptosporidiosis. Cryptosporidium-induced pathological alterations were improved remarkably in Cm-CsNFs (100 mg/kg) group. Conclusion: Our study highlights the efficacy of C. molmol as an extract or conjugated with CsNFs in declining cryptosporidiosis and attenuating Cryptosporidium-induced intestinal injury.

671 Burn Wound Healing Effect of Bromelain-loaded Chitosan Nanofibers

Abstract Introduction Bromelain is a mixture of proteolytic enzymes present in all tissues of pineapple (Ananas comosus). It is known as an efficient debriding agent in burn treatment and has been shown to effectively and selectively debride burn eschar. In this study, the efficiency of bromelain-loaded chitosan nanofibers for burn wounds repair was investigated in animal model. Methods Chitosan nanofibers containing bromelain were prepared by electrospinning method. The physicochemical characteristics of the synthetized nanofibers, release profile and activity of bromelain loaded in nanofibers were evaluated. The burn healing effect of bromelain-loaded nanofibers were studied in the induced burn wounds in rats for 21 days. The efficacy of treatment was assessed by evaluating changes in wound closer and histological analysis at different time point. Results Successful electrospinning of bromelain-loaded chitosan nanofibers resulted in uniform and bead-less nanofibers which released bromelain up to 48h. The formulation kept bromelain enzyme activity after 6-month storage at 4 °C and did not show any cytotoxicity on human dermal fibroblasts. Moreover, in vivo study in a rat burn model confirmed the safety and efficacy of applying bromelain loaded nanofibers in burn wound healing when a significant improve in wound closer was observed in bromelain loaded group and histopathological studies showed more effects on re-epithelialization, debridement and more reduction of necrosis compared to chitosan alone. Conclusions Together, these results suggest that bromelain chitosan nanofiber possesses great wound healing activity and could be considered as an effective natural topical burn wound healing treatment.

Antibacterial Chitosan Nanofiber Thin Films with Bacitracin Zinc Salt.

Chitosan nanofiber has a highly uniform structure of 20–50 nm in diameter and shows high dispersibility in water due to its submicron size and high surface-to-volume ratio. The stacked nanofibers film is useful for breathability because it has a gap with a size of several tens of nm or more. However, the chemical bonds between the nanofibers cannot be broken during use. In this study, the thin films were obtained by filtration of chitosan nanofibers and 3-glycidoxypropyltrimethoxysilane (GPTMS) mixture. The addition of GPTMS changed the wettability, mechanical property and stability in water of the thin films. Bacitracin zinc salt (BZ) has been used for the localized dermatological medicines and loaded in the films. BZ interacted electrostatically with the thin films matrix and the release of BZ was controlled by the amount of GPTMS. A higher released amount of BZ showed higher antibacterial effects toward S. aureus. The film was also tested their toxicity by L929 fibroblasts. The release of less than 11.9 μg of BZ showed antibacterial effects, but were not toxic for fibroblast cells.

Electrospun Biomaterials from Chitosan Blends Applied as Scaffold for Tissue Regeneration.

Our objective in this work was to summarize the main results obtained in processing pure chitosan and chitosan/hyaluronan complex in view of biomedical applications, taking advantage of their original properties. In addition, an electrospinning technique was selected to prepare nanofiber mats well adapted for tissue engineering in relation to the large porosity of the materials, allowing an exchange with the environment. The optimum conditions for preparation of purified and stable nanofibers in aqueous solution and phosphate buffer pH = 7.4 are described. Their mechanical properties and degree of swelling are given. Then, the prepared biomaterials are investigated to test their advantage for chondrocyte development after comparison of nanofiber mats and uniform films. For that purpose, the adhesion of cells is studied by atomic force microscopy (AFM) using single-cell force spectroscopy, showing the good adhesion of chondrocytes on chitosan. At the end, adhesion and proliferation of chondrocytes in vitro are examined and clearly show the interest of chitosan nanofiber mats compared to chitosan film for potential application in tissue engineering.

Cellulose reinforced electrospun chitosan nanofibers bio-based composite sorbent for water treatment applications

Electrospun chitosan–polyethylene oxide/TEMPO-oxidized cellulose (CS–PEO/TOC) bio-based composite was fabricated for the first time for water treatment applications. This new concept allows cellulose and chitosan to be combined in a simpler and efficient way, avoiding the use of harmful solvents, compared to previously published related work. The “Sandwich-like” material is composed of a porous oxidized cellulosic fibers central core (TOC handsheet) and a thin layer of electrospun CS–PEO nanofibers on both sides of the core. Average diameters for CS–PEO and TOC were 159.3 ± 33.7 nm and 21.7 ± 5.1 µm, respectively. Fourier Transform Infrared Spectroscopy (FTIR) was carried out on the bio-based composite. Results suggest that no covalent bonds are involved but rather electrostatic interactions occur which allows bonding of the electrospun nanofiber layers on TOC core and no delamination. CS–PEO electrospinning time was varied to study the effect of nanofiber’s coating weight on strength, permeability and adsorption capacity of the bio-based material. Mechanical properties of the composite were improved over the electrospun nanofiber mat. The CS–PEO provides greater elasticity (strain%) and the TOC provides a higher tensile strength to the material. However, tensile index was reduced by 48% with electrospinning time, while burst index was almost constant. The best conditions were achieved for 2 h electrospinning time. Under these conditions, a high permeable material (290.13 L/m2 hbar) was developed. The adsorption capacity for Cu (II) ions reached up to 27% with only 12 mg of chitosan onto the CS–PEO/TOC (12.42 mg/g). The data fit better to the pseudo-second order model, suggesting chemisorption as the main mechanism involved for copper adsorption. This study opens-up potential opportunities for the development of a robust material for wastewater applications at an industrial scale.

Multifunctional nanocomposite active packaging materials: Immobilization of quercetin, lactoferrin, and chitosan nanofiber particles in gelatin films

The design and fabrication of multifunctional films from natural materials is a major focus of modern packaging research with the aim of creating smart, active, and/or biodegradable packaging. In this study, multifunctional films were created by embedding different kinds of functional nanoparticles into a gelatin-based film prepared by a casting method. The nanoparticles were prepared by crosslinking cationic chitosan nanofibers using anionic sodium tripolyphosphate ions. In some cases, quercetin, lactoferrin, or both were incorporated into these nanoparticles. The nanoparticles were mixed with the hot gelatin solution prior to casting. The appearance, light-screening, water vapor barrier, thermal, mechanical, antimicrobial, antioxidant, and biodegradability/composting characteristics of the nanoparticle-loaded films were then characterized. Dynamic light scattering showed that the size, polydispersity, and charge of the functional nanoparticles depended on their composition. The spectroscopic analysis identified the importance of electrostatic and hydrogen bonds in film formation. Incorporation of the functional nanoparticles into the gelatin films improved their optical, mechanical, barrier, and preservative properties. For instance, the incorporation of quercetin increased the ability of the films to screen UV-light, whereas the incorporation of both lactoferrin and quercetin increased the antimicrobial and antioxidant properties of the films. Finally, the films were shown to have good biodegradability/composting under environmental conditions, which is important for reducing the negative environmental impacts caused by synthetic packaging.

Organic Solvent-Free Preparation of Chitosan Nanofibers with High Specific Surface Charge and Their Application in Biomaterials.

The application of chitosan nanofibers in biological tissue-engineering materials has attracted wide attention. A novel and organic solvent-free method was developed for the fabrication of rootlike chitosan nanofibers (CSNFs) with diameters of 40-250 nm. This method includes three-step mechanical processing of swelling-beating-centrifugation or swelling-beating-homogenization. The obtained nanofibers showed high yields (>95%) and positive specific surface charges (up to +375 μeq/g) and could be uniformly dispersed in the aqueous phase. The unique fiber shape and the good length-to-diameter ratio of CSNFs endowed chitosan nanofiber paper (CSNFP) products with excellent mechanical properties, and the wet tensile strength of the CSNFPs was nearly five times higher than common chitosan films. In addition, the calvaria-derived preosteoblastic cells exhibited a higher adherence efficiency and proliferation on CSNFP than on chitosan films. The chitosan nanofiber scaffold products also benefited the attachment of preosteoblastic cells and allowed them to grow in three dimensions. This method has significant industrial potential for the industrialization of chitosan nanofibers, which may have broad applications in various biomaterials.

Fiber template approach toward preparing one-dimensional silica nanostructure with rough surface

Silica nanofibers were grown on the surface of chitosan nanofibers used as templates by coating the surface with silica derived from the hydrolysis and condensation of tetraethoxysilane using ammonium hydroxide as a catalyst. This was followed by the decomposition of the chitosan template. The relationship between different processing factors (type of templates as well as amounts of catalyst and template) and the formation of silica nanofibers was examined. Varying the processing factors was found to be effective in controlling the morphology of the silica nanofibers. The use of chitosan nanofibers effectively led to the formation of one-dimensional silica nanofibers as the positively charged chitosan nanofibers promoted the deposition of the negatively charged silica nanoparticles through electrostatic attractive forces. Therefore, the chitosan nanofibers acted as good deposition sites for interacting with silica nanoparticles. Although a large amount of catalyst promoted the sol-gel reaction, the silica nanoparticles grew excessively in the solvent. Therefore, the surface structure of the prepared silica nanofibers could be controlled by varying the amount of chitosan template as this also varied the formation mechanism of the silica nanofibers. The resultant samples had a rough silica wall composed of densely assembled silica nanoparticles, with a high specific surface area (338 m2/g).

Comparative performance of bio-based coatings formulated with cellulose, chitin, and chitosan nanomaterials suitable for fruit preservation

Sustainable nanomaterials (SNMs) from wood, sugarcane and crab shell were prepared and used to coat selected fruits. The properties of SNMs and selected fruits were characterized and strawberry was used as an example to test antifungal activity and freshness preservation of the SNMs. The SNMs with their nano-structured morphology form strong shear-thinning dispersions for easy spraying on fruit surfaces. The fruit surface free energy was influenced by its surface morphology, predominant surface wax components, and cutin monomers. The antifungal activity of SNMs was influenced by their surface functional groups and particle size (crystals vs fibers). The coblend of wood nanocrystals (WCNCs) and chitosan nanofiber (CSNFs) exhibited the best antifungal property, which was comparable with the performance of the fungicide thiabendazole (80 mg L−1). The weight loss and color change of the WCNC/CSNF coated strawberries decreased by nearly half compared with the control samples, showing coating effectiveness on preserving fruit freshness.

Rapid recovery of phytic acid from rice brans using chitosan nanofiber-based porous hydrogels.

Phytic acid (PA) is a new type of naturally occurring pharmaceutical for afflictions such as cancer, diabetes, and renal calculi. The efficient, low-cost extraction of PA from biowaste is much sought after. Herein, highly pure PA was obtained from rice bran by adsorption at low pH onto porous chitosan nanofiber hydrogels. Due to the large surface area of the chitosan nanofiber-based porous hydrogels, the adsorption equilibrated within 60 min. Adsorption of PA was influenced by the buffer pH, temperature, and the ratio of chitosan in the hydrogel. PA was recovered by soaking the hydrogel in alkaline solution. After concentrating the solution and washing the residue with ethanol, highly pure sodium phytate was obtained with 32.2%-38.7% yield, as confirmed by Fourier transform infrared and high-performance liquid chromatography. To our knowledge, this is the first report on the recovery of pure PA in high yield without using toxic solvents.

Investigation and comparison of new galactosylation methods on PCL/chitosan scaffolds for enhanced liver tissue engineering

In liver tissue engineering, improving the ability of the scaffold to increase the tendency of cells to grow and proliferate is very important. In this study, new methods for modifying the surface of Polycaprolactone (PCL)/Chitosan (Cs) nanofiber for use in liver tissue engineering have been proposed. Galactosylation of chitosan was performed in three ways. According to the FE-SEM, FTIR, NMR and DSC analysis, presence of galactose in uniform nanofibers confirmed and led to a decrease in crystallinity. The hydrophobicity of the scaffolds by contact angle showed that the scaffold with galactosylated after electrospinning, had the highest contact angle of 82.22 ± 2° compared to raw scaffold with 98.52 ± 4°. According to the results of degradation in PBS, the highest rate of degradation was observed in scaffolds that were galactosylated after electrospinning. By culturing HepG2 cells on and based on the results of SEM and MTT analysis, found that the presence of galactose in the scaffolds significantly increased cell growth and proliferation without any toxicity. The immersion method shows a greater ability to improve the growth of liver cells. Also, using in-situ way due to the roughness created in this method may lead to better results especially for in-vivo tests.

Chitosan/PEO nanofibers electrospun on metallized track-etched membranes: fabrication and characterization

The development of next-generation adsorption, separation, and filtration materials is growing with an increased research focus on polymer composites. In this study, a novel blend of chitosan (CS) and polyethylene oxide (PEO) nanofiber mats was electrospun on titanium (Ti)-coated polyethylene terephthalate (PET) track-etched membranes (TMs) with after-treatment by glutaraldehyde in the vapor phase for enhancing the nanofiber stability by crosslinking. The prepared composite, titanium-coated track-etched nanofiber membrane (TTM-CPnf) was characterized by Fourier transform infra-red (FTIR), water contact angle, and scanning electron microscopy (SEM) analyses. Smooth and uniform CS nanofibers with an average fiber diameter of 156.55 nm were produced from a 70/30 CS/PEO blend solution prepared from 92 wt. % acetic acid and electrospun at 15 cm needle to collector distance with 0.5 mL/h flow rate and an applied voltage of 30 kV on the TTM-CPnf. Short (15 min) and long (72 h)-term solubility tests showed that after 3 h, crosslinked nanofibers were stable in acidic (pH = 3), basic (pH = 13), and neutral (pH = 7) solutions. The crosslinked TTM-CPnf material was biocompatible based on the low mortality of freshwater crustaceans Daphnia magna. The composite membranes comprised of electrospun nanofiber and TMs proved to be biocompatible and may thus be suitable for diverse applications such as dual adsorption–filtration systems in water treatment.

Effect on the processability, structure and mechanical properties of highly dispersed in situ ZnO:CS nanoparticles into PVA electrospun fibers

The main purpose of this work was to synthesize ZnO nanoparticles (NPs) in situ into a chitosan (CS) matrix to obtain highly dispersed antibacterial composites by the sol–gel technique. These composites were characterized by their thermal, structural, morphological and optical properties. NPs were subsequently used and added into polyvinyl alcohol (PVA) in order to obtain electrospun fibers. Previously, it was determined the adequate PVA/CS ratio and changes in their morphological features in dependence of molecular weight of PVA and electrospinning parameters to avoid the beads and spindle-like defects in the final fibers. Then, optimal conditions were used to fabricate PVA/in situ ZnO:CS nanofiber composites. The hydrogen bonding interaction governs the ZnO:CS system, which forms a combination between flower-type and agglomerated rod morphologies. It was found that CS promotes the crystallinity of ZnO NPs maintaining the hexagonal phase. The addition of ZnO into the CS matrix was performed via weak interactions by stabilizing the hybrid compound after the second decomposition stage when the mass loss is above 50%. Free-defects uniform fibers with an improvement in hardness as well as in the elastic modulus was obtained in the electrospun PVA/in situ ZnO:CS fibers. The presence of ZnO NPs improves the spinnability in the fiber nanocomposites with an average diameter of 223 nm. PVA/in situ ZnO:CS mats displayed an inhibition of bacterial growth of Escherichia coli and Staphylococcus aureus.

High specific surface crown ether modified chitosan nanofiber membrane by low-temperature phase separation for efficient selective adsorption of lithium

Recently, the rapid development of new energy industry has promoted a sharp increase in the demand for lithium (Li). The adsorption method has notably contributed to the recovery of lithium. However, the poor adsorption capacity and selectivity as well as the complicated preparation process of current adsorbents hinder the development of lithium adsorption. Herein, we adopted a simple and green low-temperature phase separation method to fabricate a chitosan (CS) nanofiber membrane. The specific surface area of the prepared membrane is as high as 111.55 m2 g−1. Meanwhile, for the sake of high selectivity for Li+, we chose 2-(Hydroxymethyl)-12-crown 4-Ether (2H12C4) with a unique cavity structure to graft onto the surface of CS to prepare crown ether (CE) modified chitosan nanofiber membranes (CS-CE). The results show that CS-CE achieved the maximum adsorption capacity of 297 mg g−1 from a high-concentration Li+ solution with 1000 mg L−1 at pH 7.0. In a mixed solution coexisting with other interfering metal ions, CS-CE still exhibited a strong affinity for Li+. In addition, after 5 cycle experiments, the maximum adsorption capacity of CS-CE for Li+ decreased by only 8.8%, which proves the excellent reusability of CS-CE. Overall results suggested that CS-CE can be a promising candidate for the recovery of Li+.

Electrospun chitosan nanofibers for wound healing application

Abstract Electrospun nanofibers have been considered as relatively ideal material system for the design and construction of surgical wound dressings in the past few decades. Although there are lots of other biopolymers employed for electrospinning, chitosan is one of the most important biopolymers for the fabrication of electrospun nanofibers, due to its nontoxic, antibacterial, biocompatible as well as biodegradable properties. Electrospun chitosan nanofibers with random or aligned fiber structure can further be cross-linked by physical, chemical and ionic crosslinking methods. The as-crosslinked electrospun chitosan nanofibrous membranes possess enhanced wet stability, improved mechanical property and good biocompatibility, which are necessary for wound healing application. The present work reviews the recent studies on the design and development of electrospun chitosan nanofibers and their applications for wound healing, such as antibacterial materials, hemostatic dressings, angiogenesis and immune regulation.

Electrospinning of chitosan from different acid solutions

Electrospinning is a production technique for obtaining polymer nanofibers relatively low-cost and straightforward to produce fine fibers. Chitosan (CTS) is a well-known biopolymer widely used for drug delivery, hydrogels, tissue engineering, wound healing, and mats. This work aims to study different chitosan-organic acid solutions' conductivity using electrochemical impedance spectroscopy and equivalent circuit fitting to understand this parameter's influence in the electrospinning process for fiber formation in different organic acids as solvents. The conductivity of dilute chitosan solutions decreases until reaching a minimum value as chitosan concentration increases; conductivity increases linearly as concentration increases. We measured solution resistance, polarization resistance, and relaxation time of chitosan solutions in acetic, formic, lactic, and citric acids using electrical impedance spectroscopy with equivalent circuit modeling. There is no direct correlation between the electrospinnability of the different organic acids solutions with their solution conductivity. We obtained chitosan nanofibers and particles when electrospun a chitosan concentrated solution (4 wt%) in concentrated acetic acid (90 vol%) and obtained submicron particles with a more diluted solution (1 wt%) in concentrated acetic acid (90 vol%). We also obtained chitosan particles from formic acid solutions and completely different ordered and elongated particles with citric acid solutions. Getting insight into the organic acid-chitosan interactions will help improve the electrospinning process to obtain fibers, particles, or both in a controlled fashion and may help design tailored materials.

Designing New Antibacterial Wound Dressings: Development of a Dual Layer Cotton Material Coated with Poly(Vinyl Alcohol)_Chitosan Nanofibers Incorporating Agrimonia eupatoria L. Extract

Wounds display particular vulnerability to microbial invasion and infections by pathogenic bacteria. Therefore, to reduce the risk of wound infections, researchers have expended considerable energy on developing advanced therapeutic dressings, such as electrospun membranes containing antimicrobial agents. Among the most used antimicrobial agents, medicinal plant extracts demonstrate considerable potential for clinical use, due primarily to their efficacy allied to relatively low incidence of adverse side-effects. In this context, the present work aimed to develop a unique dual-layer composite material with enhanced antibacterial activity derived from a coating layer of Poly(vinyl alcohol) (PVA) and Chitosan (CS) containing Agrimonia eupatoria L. (AG). This novel material has properties that facilitate it being electrospun above a conventional cotton gauze bandage pre-treated with 2,2,6,6-tetramethylpiperidinyl-1-oxy free radical (TEMPO). The produced dual-layer composite material demonstrated features attractive in production of wound dressings, specifically, wettability, porosity, and swelling capacity. Moreover, antibacterial assays showed that AG-incorporated into PVA_CS’s coating layer could effectively inhibit Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) growth. Equally important, the cytotoxic profile of the dual-layer material in normal human dermal fibroblast (NHDF) cells demonstrated biocompatibility. In summary, these data provide initial confidence that the TEMPO-oxidized cotton/PVA_CS dressing material containing AG extract demonstrates adequate mechanical attributes for use as a wound dressing and represents a promising approach to prevention of bacterial wound contamination.

Adsorptive defluoridation from aqueous solution using a novel blend of eggshell powder and chitosan nanofibers

Groundwater mostly contains many impurities thus can not be consumed as drinking water directly. The acceptable limit of fluoride in drinking water is 0.5–1.5 mg l−1 recommended by World Health Organization (WHO). In this research, a novel nanofiber hybrid; based on Chitosan (CTS) and Eggshell (EGG) was prepared via electrospinning technique and investigated for deflouridation from aqueous solution. SEM images reveal bead-free, smooth morphology and the FTIR confirmed the presence of chitosan and egg within the novel nanofiber blend. The defluoridation efficiency was assessed by varying the different parameters like pH, mass of nanofibers, contact time and initial concentration for adsorption. Studies revealed that CTS/EGG nanofibers hybrid shows incredible adsorption efficiency of 86%. Furthermore, isotherm studies show that the Langmuir isotherm model was well fitted for both CTS and CTS/EGG nanofibers.

Nanofibrillated chitosan coated highly ordered titania nanotubes array/graphene nanocomposite with improved biological characters

Designing multifunctional surfaces is key to develop advanced materials for orthopedic applications. In this study, we design a double-layer coating, assembled onto the completely regular titania nanotubes (cRTNT) array. Benefiting from the biological and topological characteristics of chitosan nanofibers (CH) and reduced graphene oxide (RGO) through a unique assembly, the designed material features promoted osteoblast cell viability, prolonged antibiotic release profile, as well as inhibited bacterial biofilm formation. The synergistic effect of RGO and CH on the biological performance of the surface is investigatSed. The unique morphology of the nanofibers leads to the partial coverage of RGO-modified nanotubes, providing an opportunity to access the sublayer properties. Another merit of this coating lies in its morphological similarity to the extracellular matrix (ECM) to boost cellular performance. According to the results of this study, this platform holds promising advantages over the bare and bulk biopolymer-modified TNTs.