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1.
Heliyon ; 10(5): e26307, 2024 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-38468974

RESUMEN

Recently, with the development of non-invasive human health monitoring technology including wearable devices, a flexible sensor that monitors 'human sound and movement signals' such as human voice and muscle movement is attracting attention. In this experiment, electrospun nanofibers were mixed with highly conductive nanoparticles and coated with polyaniline to detect the patient's electrical signals. Due to the high piezoelectric effect, nanofiber-based sensors do not require charging through a separate battery, so they can be used as self-powered devices. In addition, the LCR meter test confirmed that the sensor has a high capacitance due to its high conductivity and high sensitivity to electrical signals. The sensor produced in this study can visually estimate the electrical signal of the actual human body through real-time comparison with electromyography (EMG) measuring equipment, and it was confirmed that the error is small. This sensor is expected to be widely used in the medical field, from simple sound and movement signals to disease monitoring.

2.
Nanomaterials (Basel) ; 13(17)2023 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-37686978

RESUMEN

An engineered 3D architectural network of the biopolymeric hydrogel can mimic the native cell environment that promotes cell infiltration and growth. Among several bio-fabricated hydrogel structures, core-shell microcapsules inherit the potential of cell encapsulation to ensure the growth and transport of cells and cell metabolites. Herein, a co-axial electrostatic encapsulation strategy is used to create and encapsulate the cells into chitin nanofibrils integrated alginate hydrogel microcapsules. Three parameters that are critical in the electrostatic encapsulation process, hydrogel composition, flow rate, and voltage were optimized. The physicochemical characterization including structure, size, and stability of the core-shell microcapsules was analyzed by scanning electron microscope (SEM), FTIR, and mechanical tests. The cellular responses of the core-shell microcapsules were evaluated through in vitro cell studies by encapsulating NIH/3T3 fibroblast cells. Notably, the bioactive microcapsule showed that the cell viability was found excellent for more than 2 weeks. Thus, the results of this core-shell microcapsule showed a promising approach to creating 3D hydrogel networks suitable for different biomedical applications such as in vitro tissue models for toxicity studies, wound healing, and tissue repair.

3.
Colloids Surf B Biointerfaces ; 223: 113152, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36739675

RESUMEN

Fabricating bioartificial bone graft ceramics retaining structural, mechanical, and bone induction properties akin to those of native stem-cell niches is a major challenge in the field of bone tissue engineering and regenerative medicine. Moreover, the developed materials are susceptible to microbial invasion leading to biomaterial-centered infections which might limit their clinical translation. Here, we successfully developed biomimetic porous scaffolds of polyurethane-reinforcedL-cysteine-anchored polyaniline capped strontium oxide nanoparticles to improve the scaffold's biocompatibility, osteo-regeneration, mechanical, and antibacterial properties. The engineered nanocomposite substrate PU/L-Cyst-SrO2 @PANI (0.4 wt%) significantly promotes bone repair and regeneration by modulating osteolysis and osteogenesis. ALP activity, collagen-I, ARS staining, as well as biomineralization of MC3T3-E1 cells, were used to assess the biocompatibility and cytocompatibility of the developed scaffolds in vitro, confirming that the scaffold provided a favorable microenvironment with a prominent effect on cell growth, proliferation, and differentiation. Furthermore, osteogenic protein markers were studied using qRT-PCR with expression levels of runt-related transcription factor 2 (RUNX2), secreted phosphoprotein 1 (Spp-I), and collagen type I (Col-I). The overall results suggest that PU/L-Cyst-SrO2 @PANI (0.4 wt%) scaffolds showed superior interfacial biocompatibility, antibacterial properties, load-bearing ability, and osteoinductivity as compared to pristine PU. Thus, prepared bioactive nanocomposite scaffolds perform as a promising biomaterial substrate for bone tissue regeneration.


Asunto(s)
Nanofibras , Osteogénesis , Cisteína/farmacología , Andamios del Tejido/química , Poliuretanos/farmacología , Nanofibras/química , Materiales Biocompatibles/química , Ingeniería de Tejidos/métodos , Regeneración Ósea , Diferenciación Celular , Colágeno Tipo I/farmacología , Antibacterianos/farmacología
4.
Mater Sci Eng C Mater Biol Appl ; 131: 112501, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34857287

RESUMEN

Bioactive mesoporous binary metal oxide nanoparticles allied with polymeric scaffolds can mimic natural extracellular matrix because of their self-mineralized functional matrix. Herein, we developed fibrous scaffolds of polycaprolactone (PCL) integrating well-dispersed TiO2@ZrO2 nanoparticles (NPs) via electrospinning for a tissue engineering approach. The scaffold with 0.1 wt% of bioceramic (TiO2@ZrO2) shows synergistic effects on physicochemical and bioactivity suited to stem cell attachment/proliferation. The bioceramics-based scaffold shows excellent antibacterial activity that can prevent implant-associated infections. In addition, the TiO2@ZrO2 in scaffold serves as a stem cell microenvironment to accelerate cell-to-cell interactions, including cell growth, morphology/orientation, differentiation, and regeneration. The NPs in PCL exert superior biocompatibility on MC3T3-E1 cells inducing osteogenic differentiation. The ALP activity and ARS staining confirm the upregulation of bone-related proteins and minerals suggesting the scaffolds exhibit osteoinductive abilities and contribute to bone cell regeneration. Based on this result, the bimetallic oxide could become a novel bone ceramic tailor TiO2@ZrO2 composite tissue-construct and keep potential nanomaterials-based scaffold for bone tissue engineering strategy.


Asunto(s)
Osteogénesis , Andamios del Tejido , Antibacterianos/farmacología , Regeneración Ósea , Diferenciación Celular , Proliferación Celular , Poliésteres/farmacología , Ingeniería de Tejidos , Titanio , Soporte de Peso
5.
Nanotechnology ; 33(5)2021 Nov 08.
Artículo en Inglés | MEDLINE | ID: mdl-34673562

RESUMEN

In this work, we synthesized a monolayer of graphene and hexagonal boron nitride (hBN) using chemical vapor deposition. The physicochemical and electrochemical properties of the materials were evaluated to determine their morphology. High-purity materials and their atomic-scale coating on copper (Cu) foil were employed to prevent fast degradation rate. The hexagonal two-dimensional (2D) atomic structures of the as-prepared materials were assessed to derive their best anti-corrosion behavior. The material prepared under optimized conditions included edge-defect-free graphene nanosheets (∼0.0034µm2) and hBN (∼0.0038µm2) per unit area of 1µm2. The coating of each material on the Cu surface significantly reduced the corrosion rate, which was âˆ¼2.44 × 10-2/year and 6.57 × 10-3/year for graphene/Cu and hBN/Cu, respectively. Importantly, the corrosion rate of Cu was approximately 3-fold lower after coating with hBN relative to that of graphene/Cu. This approach suggests that the surface coating of Cu using cost-effective, eco-friendly, and the most abundant materials in nature is of interest for developing marine anti-corrosion micro-electronic devices and achieving surface modification of pure metals in industrial applications.

6.
ACS Appl Mater Interfaces ; 13(39): 47100-47117, 2021 Oct 06.
Artículo en Inglés | MEDLINE | ID: mdl-34579527

RESUMEN

Titanium-based substrates are widely used in orthopedic treatments and hard tissue engineering. However, many of these titanium (Ti) substrates fail to interact properly between the cell-to-implant interface, which can lead to loosening and dislocation from the implant site. As a result, scaffold implant-associated complications and the need for multiple surgeries lead to an increased clinical burden. To address these challenges, we engineered osteoconductive and osteoinductive biosubstrates of chitosan (CS)-cross-linked polyaniline (PANI) nanonets coated on titanium nanotubes (TiO2NTs) in an attempt to mimic bone tissue's major extracellular matrix. Inspired by the architectural and tunable mechanical properties of such tissue, the TiO2NTs-PANI@CS-based biofilm conferred strong anticorrosion, the ability to nucleate hydroxyapatite nanoparticles, and excellent biocompatibility with human bone marrow-derived mesenchymal stem cells (hBM-MSCs). An in vitro study showed that the substrate-supported cell activities induced greater cell proliferation and differentiation compared to cell-TiO2NTs alone. Notably, the bone-related genes (collagen-I, OPN, OCN, and RUNX 2) were highly expressed within TiO2NTs-PANI@CS over a period of 14 days, indicating greater bone cell differentiation. These findings demonstrate that the in vitro functionality of the cells on the osteoinductive-like platform of TiO2NTs-PANI@CS improves the efficiency for osteoblastic cell regeneration and that the substrate potentially has utility in bone tissue engineering applications.


Asunto(s)
Materiales Biomiméticos/farmacología , Células Madre Mesenquimatosas/efectos de los fármacos , Nanotubos/química , Osteoblastos/metabolismo , Andamios del Tejido/química , Compuestos de Anilina/química , Compuestos de Anilina/farmacología , Materiales Biomiméticos/química , Diferenciación Celular/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Quitosano/química , Quitosano/farmacología , Humanos , Células Madre Mesenquimatosas/metabolismo , Osteogénesis/efectos de los fármacos , Ingeniería de Tejidos/métodos , Titanio/química , Titanio/farmacología
7.
Mater Sci Eng C Mater Biol Appl ; 127: 112176, 2021 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-34225892

RESUMEN

The bioengineering electroactive construct of a nerve-guided conduit for repairing and restoring injured nerves is an exciting biomedical endeavor that has implications for the treatment of peripheral nerve injury. In this study, we report the development the polycaprolactone (PCL) nanofibrous substrate consisting of turmeric (TUR) and polyaniline nanoparticles (PANINPs) exhibits topological and biological features that mimics the natural extracellular matrix (ECM) for nerve cells. We evaluated the morphology of 2-dimensional (2D) fibrous substrates, and their ability of stem cell adhesion, growth and proliferation rate were influenced by use of various concentrations of turmeric in PCL-TUR substrates. The results showed that 0.62 wt% of TUR and 0.28 wt% of PANINPs in PCL nanofibers substrate exhibited the optimal cellular microenvironment to accelerate PC12 cellular activities. The in vitro experiments revealed that PCL-TUR@PANI substrates significantly stimulated the proliferation, differentiation, and spontaneous outgrowth and extension of neurites from the cells. The substrate has the capacity to respond directly to neuronal markers with significant upregulation of ßIII-Tubulin and TREK-1 through myelination, and also trigger neurotrophic protein expression, which was confirmed via immunocytochemistry and quantitative real-time polymerase chain reaction (qRT-PCR) analysis. This study provides a new technique to design substrate of nerve tissue-specific microenvironment for peripheral nerve cell regeneration and could offer promising biomaterials for in vivo peripheral nerve repair.


Asunto(s)
Nanofibras , Nanopartículas , Compuestos de Anilina , Animales , Diferenciación Celular , Curcuma , Regeneración Nerviosa , Células PC12 , Poliésteres , Canales de Potasio de Dominio Poro en Tándem , Ratas , Reacción en Cadena en Tiempo Real de la Polimerasa , Ingeniería de Tejidos , Andamios del Tejido , Tubulina (Proteína)/genética
8.
Biomater Sci ; 9(5): 1691-1704, 2021 Mar 10.
Artículo en Inglés | MEDLINE | ID: mdl-33410823

RESUMEN

Structural parameters, such as metal-like semiconductor and electrochemical properties of functionalized polyaniline, hold great potential especially for the development of the cell-substrate interface due to its ion/electron transfer ability. We report the one-step synthesis of sulfonic acid-doped polyaniline nanobuds (s-PANINbs) with controlled shape/size under various oxidation potentials. The different oxidation states of s-PANINbs are used to investigate the cell-specific platform for the induction of neuronal networks in PC12 cells, including the growth, proliferation, and differentiation of cells. The unique structure of one-dimensional (1-D) s-PANINbs enhances its intrinsic conductive properties, and facilitates the dispersibility and electrochemical activity via covalent bonding with dopants. The protonated emeraldine salt nanobuds of s-PANINbs synthesized at 0.18 V anodic potential demonstrated low resistivity (∼81.18 mΩ) and charge transfer resistance (∼3253 Ω). The most biologically compatible protonated emeraldine salt was used in vitro to induce PC12 cells associated with neurite outgrowth, contributing to the electrophysiology of neuronal cells under an external electrical stimulation. The western blotting analysis and qRT-PCR results show that ß-III Tubulin, synapsin I, and TREK-1 are highly expressed in PC12 cells, confirming their successful differentiation into neural-specific cells. Our approach demonstrates the promising role of the self-standing framework based on the s-PANINbs of the protonated emeraldine salt in peripheral nerve repair for the future in vivo cell-interface.


Asunto(s)
Proyección Neuronal , Ácidos Sulfónicos , Animales , Comunicación Celular , Diferenciación Celular , Células PC12 , Ratas
9.
Carbohydr Polym ; 251: 117035, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-33142593

RESUMEN

A biomimetic-based approaches, especially with artificial scaffolding, have established great potential to provide tissue regeneration capacity and an effective way to bridge the gap between host cell responses and organ demands. However, the synthesis of biomaterial is most efficient when the functional behavior involved most resembles the natural extracellular matrix. Here, a fibrous scaffold was engineered by integrating zein and chitosan (CS) in to polyurethane (PU) associated with functionalized multiwalled carbon nanotubes (fMWCNTs) as a bone cell repair material. The chitosan-based, tissue-engineered scaffold containing 0.1 mg/mL fMWCNTs shows potent synergistic results where improved biomechanical strength, hydrophilicity and antibacterial efficacy produce a scaffold akin to a truly natural extracellular matrix found in the bone cell microenvironments. The scaffold enables rapid cell-to-cell communication through a bio-interface and greatly promotes the regenerative effect of pre-osteoblast (MC3T3-E1) which is reflected in terms of cell growth, proliferation, and differentiation in our in vitro experiments. Alizarin red staining analysis, alkaline phosphatase activity, and Western blotting also confirm the nucleation of hydroxyapatite (HA) nanocrystals and the expression of osteogenic protein markers, all of which indicate the scaffold's excellent osteoinductive properties. These results suggest that this precisely engineered PU/Zein/CS-fMWCNTs fibrous scaffold possesses suitable biological behavior to act as an artificial bone extracellular matrix that will ensure bone cell regeneration while contributing numerous benefits to the field of artificial bone grafts.


Asunto(s)
Materiales Biocompatibles , Regeneración Ósea , Quitosano , Osteogénesis , Ingeniería de Tejidos , Andamios del Tejido , Zeína , Animales , Materiales Biocompatibles/química , Diferenciación Celular , Línea Celular , Proliferación Celular , Microambiente Celular , Quitosano/química , Ratones , Nanotubos de Carbono/química , Osteoblastos , Poliuretanos/química , Zeína/química
10.
Mater Sci Eng C Mater Biol Appl ; 116: 111213, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32806222

RESUMEN

Herein, we report the bioactivity of monodispersed nanosized reduced graphene oxide (RGO) enfolded gold nanoparticles (AuNPs) engineered polycaprolactone (PCL) based electrospun composite scaffolds. The 2D patterns of PCL based nanofibers prepared by the homogenous distribution of RGO-AuNPs exhibited unique topological and biological features such as mechanical properties, porous structure, large surface area, high electrical conductivity, biodegradability, and resemble the natural extracellular matrix (ECM) that supports the adhesion, growth, proliferation, and differentiation of stem cells. The prepared composite nanofibers based scaffolds containing RGO-AuNPs accelerated neuronal cell functions and confirmed that the optimized concentration showed cytocompatibility to PC12 and S42 cells. The 0.0005 wt% loading of RGO-AuNPs on PCL has a huge impact on neurite growth which leads to an almost one-fold increase in neurite length growth. The present study provides a new strategic design of highly efficient scaffolds that have a significant direct impact on cell activity and could be a potential bioimplant for peripheral nerve repair.


Asunto(s)
Nanopartículas del Metal , Nanofibras , Proliferación Celular , Oro , Regeneración Nerviosa , Nervios Periféricos , Poliésteres , Ingeniería de Tejidos , Andamios del Tejido
11.
Polymers (Basel) ; 12(2)2020 Feb 13.
Artículo en Inglés | MEDLINE | ID: mdl-32069827

RESUMEN

Herein, we describe precisely a covalent modification of pure magnesium (Mg) surface and its application to induce in vitro osteogenic differentiation. The new concept of a chemical bonding method is proposed for developing stable chemical bonds on the Mg surface through the serial assembly of bioactive additives that include ascorbic acid (AA) and bovine serum albumin (BSA). We studied both the physicochemical and electrochemical properties using scanning electron microscopy and other techniques to confirm how the covalent bonding of BSA on Mg can, after coating, significantly enhance the chemical stability of the substrate. The modified Mg-OH-AA-BSA exhibits better anti-corrosion behavior with high corrosion potential (Ecorr = -0.96 V) and low corrosion current density (Icorr = 0.2 µA cm-2) as compared to the pure Mg (Ecorr = -1.46 V, Icorr = 10.42 µA cm-2). The outer layer of BSA on Mg protects the fast degradation rate of Mg, which is the consequence of the strong chemicals bonds between amine groups on BSA with carboxylic groups on AA as the possible mechanism of peptide bonds. Collectively, the results suggest that the surface-modified Mg provides a strong bio-interface, and enhances the proliferation and differentiation of pre-osteoblast (MC3T3-E1) cells through a protein-lipid interaction. We therefore conclude that the technique we describe provides a cost-effective and scalable way to generate chemically stable Mg surface that inherits a biological advantage in orthopedic and dental implants in clinical applications.

12.
Mater Sci Eng C Mater Biol Appl ; 102: 511-523, 2019 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31147022

RESUMEN

A fibrous scaffold, fully assimilating polyurethane (PU) and silk fibroin associated with functionalized multi-walled carbon nanotubes (fMWCNTs) was developed by electrospinning technique. Herein, we engineered the PU/Silk fibroin-fMWCNTs-based biomaterial that shows great promise as electrospun scaffolds for neuronal growth and differentiation, because of its unique mechanical properties, hydrophilicity, and biodegradability, with outstanding biocompatibility in nerve tissue engineering. The morphology and structural properties of the scaffolds were studied using various techniques. In particular, the presence of fMWCNTs enhances the electrical conductivity and plausible absorption of sufficient extracellular matrix (ECM). The in vitro tests revealed that the aligned scaffolds (PU/Silk-fMWCNTs) significantly stimulated the growth and proliferation of Schwann cells (S42), together with the differentiation and spontaneous neurite outgrowth of rat pheochromocytoma (PC12) cells that were particularly guided along the axis of fiber alignment. The conductive PU/Silk-fMWCNTs scaffold significantly improves neural expression in vitro with successful axonal regrowth, which was confirmed by immunocytochemistry and qRT-PCR analysis. Inspired by the comprehensive experimental results, the fMWCNTs-based scaffold affords new insight into nerve-guided conduit design from both conductive and protein rich standpoints, and opens a new perspective on peripheral nerve restoration in preclinical applications.


Asunto(s)
Conductividad Eléctrica , Nanotubos de Carbono/química , Regeneración Nerviosa/efectos de los fármacos , Neuronas/fisiología , Poliuretanos/farmacología , Seda/farmacología , Animales , Fenómenos Biomecánicos , Bombyx , Diferenciación Celular/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Nanofibras/química , Nanofibras/ultraestructura , Nanotubos de Carbono/ultraestructura , Neuronas/efectos de los fármacos , Células PC12 , Ratas , Estrés Mecánico , Andamios del Tejido/química , Agua
13.
J Colloid Interface Sci ; 518: 234-241, 2018 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-29462758

RESUMEN

Mesoporous architectures are remarkable electrode materials for energy storage system due to their large number of active sites and high surface area. Here we report, mesoporous MoS2 particles (pore diameter 34.04 nm) well attached to the surface of thin layered reduced graphene oxide (rGO) via an ultrasonic chemical method for supercapacitor applications. The rGO not only increases the conductivity of MoS2 but also provides a substrate for the attachment of MoS2 with low aggregation. The porous MoS2 provides a large surface area and sufficient way for the fast transport of electrolyte ions toward electrode materials. As a result, the synthesized MoS2/rGO composites exhibited excellent electrochemical performance with a specific capacitance 314.5 F/g in 2M KOH aqueous solution at a scan rate of 10 mV/s and excellent specific capacitance retention (80.02%) after 1000 cycles in a three electrode system for energy storage applications.

14.
Sci Rep ; 7(1): 16191, 2017 11 23.
Artículo en Inglés | MEDLINE | ID: mdl-29170481

RESUMEN

Herein, we report preparation of a bio-nanohybrid material of homogenously dispersed functionalized multiwall carbon nanotubes (fMWCNTs) in Nafion (Nf) doped with polypyrrole (PPy) and followed by one-step in situ electrochemical polymerization along with glucose oxidase (GOx) on a platinum (Pt) electrode. The bioengineered Nf-GOx-fMWCNTs-PPy/Pt electrode showed excellent electrocatalytic performance to detect glucose with a high sensitivity (54.2 µAmM-1 cm-2) in linear range of up to 4.1 mM as well as a low detection limit of 5 µM (S/N = 3), response time within 4 s, good selectivity, stability, and practical applicability. It is our hope that the comprehensive results will contribute to design an efficient glucose biosensor with practical prospects for biomedical applications.


Asunto(s)
Técnicas Biosensibles , Electroquímica/métodos , Glucosa Oxidasa/análisis , Nanotubos de Carbono/química , Polímeros/química , Pirroles/química , Electrodos
15.
Biosens Bioelectron ; 94: 686-693, 2017 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-28390320

RESUMEN

Herein, we demonstrate the exfoliation of bulk graphitic carbon nitrides (g-C3N4) into ultra-thin (~3.4nm) two-dimensional (2D) nanosheets and their functionalization with proton (g-C3N4H+). The layered semiconductor g-C3N4H+ nanosheets were doped with cylindrical spongy shaped polypyrrole (CSPPy-g-C3N4H+) using chemical polymerization method. The as-prepared nanohybrid composite was utilized to fabricate cholesterol biosensors after immobilization of cholesterol oxidase (ChOx) at physiological pH. Large specific surface area and positive charge nature of CSPPy-g-C3N4H+ composite has tendency to generate strong electrostatic attraction with negatively charged ChOx, and as a result they formed stable bionanohybrid composite with high enzyme loading. A detailed electrochemical characterization of as-fabricated biosensor electrode (ChOx-CSPPy-g-C3N4H+/GCE) exhibited high-sensitivity (645.7 µAmM-1 cm-2) in wide-linear range of 0.02-5.0mM, low detection limit (8.0µM), fast response time (~3s), long-term stability, and good selectivity during cholesterol detection. To the best of our knowledge, this novel nanocomposite was utilized for the first time for cholesterol biosensor fabrication that resulted in high sensing performance. Hence, this approach opens a new prospective to utilize CSPPy-g-C3N4H+ composite as cost-effective, biocompatible, eco-friendly, and superior electrocatalytic as well as electroconductive having great application potentials that could pave the ways to explore many other new sensors fabrication and biomedical applications.


Asunto(s)
Técnicas Biosensibles/métodos , Colesterol/aislamiento & purificación , Técnicas Electroquímicas/métodos , Nanocompuestos/química , Colesterol/química , Colesterol Oxidasa/química , Enzimas Inmovilizadas/química , Grafito/química , Humanos , Límite de Detección , Nanotubos de Carbono/química , Nitrilos/química , Polímeros/química , Pirroles/química
16.
J Colloid Interface Sci ; 482: 39-47, 2016 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-27485503

RESUMEN

A highly electroactive bio-nanohybrid film of polypyrrole (PPy)-Nafion (Nf)-functionalized multi-walled carbon nanotubes (fMWCNTs) nanocomposite was prepared on the glassy carbon electrode (GCE) by a facile one-step electrochemical polymerization technique followed by chitosan-glucose oxidase (CH-GOx) immobilization on its surface to achieve a high-performance glucose biosensor. The as-fabricated nanohybrid composite provides high surface area for GOx immobilization and thus enhances the enzyme-loading efficiency. The structural characterization revealed that the PPy-Nf-fMWCNTs nanocomposite films were uniformly formed on GCE and after GOx immobilization, the surface porosities of the film were decreased due to enzyme encapsulation inside the bio-nanohybrid composite materials. The electrochemical behavior of the fabricated biosensor was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and amperometry measurements. The results indicated an excellent catalytic property of bio-nanohybrid film for glucose detection with improved sensitivity of 2860.3µAmM(-1)cm(-2), the linear range up to 4.7mM (R(2)=0.9992), and a low detection limit of 5µM under a signal/noise (S/N) ratio of 3. Furthermore, the resulting biosensor presented reliable selectivity, better long-term stability, good repeatability, reproducibility, and acceptable measurement of glucose concentration in real serum samples. Thus, this fabricated biosensor provides an efficient and highly sensitive platform for glucose sensing and can open up new avenues for clinical applications.


Asunto(s)
Técnicas Biosensibles/métodos , Glucemia/análisis , Quitosano/química , Polímeros de Fluorocarbono/química , Glucosa Oxidasa/química , Nanotubos de Carbono/química , Polímeros/química , Pirroles/química , Biocatálisis , Técnicas Biosensibles/instrumentación , Técnicas Electroquímicas , Enzimas Inmovilizadas/química , Humanos , Límite de Detección , Nanocompuestos/química , Nanocompuestos/ultraestructura , Porosidad , Reproducibilidad de los Resultados , Relación Señal-Ruido , Propiedades de Superficie
17.
Carbohydr Polym ; 148: 107-14, 2016 09 05.
Artículo en Inglés | MEDLINE | ID: mdl-27185121

RESUMEN

The development of biofunctional and bioactive hybrid polymeric scaffolds seek to mitigate the current challenges in the emerging field of tissue engineering. In this paper, we report the fabrication of a biomimetic and biocompatible nanofibrous scaffolds of polyamide-6,6 (PA-6,6) blended with biopolymer chitosan via one step co-electrospinning technique. Different weight percentage of chitosan 10wt%, 15wt%, and 20wt% were blended with PA-6,6, respectively. The nanocomposite electrospun scaffolds mats enabled to provide the osteophilic environment for cells growth and biomineralization. The morphological and physiochemical properties of the resulted scaffolds were studied using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and Fourier transform-infrared (FT-IR) spectroscopy. The improvement in hydrophilicity and mechanical strength of the bio-nanocomposite mesh with 20wt% chitosan embedded, was the desired avenue for adhesion, proliferation and maturation of osteoblast cells as compared to other sample groups and pure PA-6,6 fibrous mat. The biomineralization of the nanocomposite electrospun mats also showed higher ability to nucleate bioactive calcium phosphate (Ca/P) nanoparticles comparing to pristine PA-6,6. Furthermore, the biomimetic nature of scaffolds exhibited the cells viability and regeneration of pre-osteoblast (MC3T3-E1) cells which were assessed via in vitro cell culture test. Collectively, the results suggested that the optimized 20wt% of chitosan supplemented hybrid electrospun fibrous scaffold has significant effect in biomedical field to create osteogenic capabilities for tissue engineering.


Asunto(s)
Quitosano/química , Nanofibras/química , Nylons/química , Ingeniería de Tejidos/métodos , Andamios del Tejido/química , Microscopía Electrónica de Rastreo , Nanofibras/ultraestructura , Espectroscopía Infrarroja por Transformada de Fourier
18.
ACS Appl Mater Interfaces ; 7(35): 19672-83, 2015 Sep 09.
Artículo en Inglés | MEDLINE | ID: mdl-26295953

RESUMEN

Post-electrospinning treatment is a facile process to improve the properties of electrospun nanofibers for various applications. This technique is commonly used when direct electrospinning is not a suitable option to fabricate a nonwoven membrane of the desired polymer in a preferred morphology. In this study, a representative natural-synthetic hybrid of cellulose acetate (CA) and polycaprolactone (PCL) in different ratios was fabricated using an electrospinning process, and CA in the hybrid fiber was transformed into cellulose (CL) by post-electrospinning treatment via alkaline saponification. Scanning electron microscopy was employed to study the effects of polymer composition and subsequent saponification on the morphology of the nanofibers. Increasing the PCL content in the PCL/CA blend solution caused a gradual decrease in viscosity, resulting in smoother and more uniform fibers. The saponification of fibers lead to pronounced changes in the physicochemical properties. The crystallinity of the PCL in the composite fiber was varied according to the composition of the component polymers. The water contact angle was considerably decreased (from 124° to less than 20°), and the mechanical properties were greatly enhanced (Young's Modulus was improved by ≈20-30 fold, tensile strength by 3-4 fold, and tensile stress by ≈2-4 fold) compared to those of PCL and PCL/CA membranes. Regeneration of cellulose chains in the nanofibers increased the number of hydroxyl groups, which increased the hydrogen bonding, thereby improving the mechanical properties and wettability of the composite nanofibers. The improved wettability and presence of surface functional groups enhanced the ability to nucleate bioactive calcium phosphate crystals throughout the matrix when exposed to a simulated body fluid solution. Experimental results of cell viability assay, confocal microscopy, and scanning electron microscopy imaging showed that the fabricated nanofibrous membranes have excellent ability for MC3T3-E1 cell proliferation and growth. Given the versatility and widespread use of cellulose-synthetic hybrid systems in the construction of tissue-engineered scaffolds, this work provides a novel strategy to fabricate the biopolymer-based materials for applications in tissue engineering and regenerative medicine.


Asunto(s)
Celulosa/análogos & derivados , Nanofibras/química , Nanopartículas/química , Poliésteres/química , Animales , Materiales Biocompatibles/química , Materiales Biocompatibles/farmacología , Línea Celular , Supervivencia Celular/efectos de los fármacos , Celulosa/química , Durapatita/química , Módulo de Elasticidad , Ratones , Nanofibras/toxicidad , Nanofibras/ultraestructura , Ingeniería de Tejidos , Andamios del Tejido
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