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1.
Int J Biol Macromol ; 265(Pt 1): 130954, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38499125

RESUMO

Designing multifunctional wound dressings is a prerequisite to prevent infection and stimulate healing. In this study, a bilayer scaffold (BS) with a top layer (TL) comprising 3D printed pectin/polyacrylic acid/platelet rich fibrin hydrogel (Pec/PAA/PRF) and a bottom nanofibrous layer (NL) containing Pec/PAA/simvastatin (SIM) was produced. The biodegradable and biocompatible polymers Pec and PAA were cross-linked to form hydrogels via Ca2+ activation through galacturonate linkage and chelation, respectively. PRF as an autologous growth factor (GF) source and SIM together augmented angiogenesis and neovascularization. Because of 3D printing, the BS possessed a uniform distribution of PRF in TL and an average fiber diameter of 96.71 ± 18.14 nm was obtained in NL. The Young's modulus of BS was recorded as 6.02 ± 0.31 MPa and its elongation at break was measured as 30.16 ± 2.70 %. The wound dressing gradually released growth factors over 7 days of investigation. Furthermore, the BS significantly outperformed other groups in increasing cell viability and in vivo wound closure rate (95.80 ± 3.47 % after 14 days). Wounds covered with BS healed faster with more collagen deposition and re-epithelialization. The results demonstrate that the BS can be a potential remedy for skin tissue regeneration.


Assuntos
Fibrina Rica em Plaquetas , Sinvastatina/farmacologia , Sinvastatina/metabolismo , Pectinas/farmacologia , Pectinas/metabolismo , Pele/metabolismo , Impressão Tridimensional
2.
Int J Pharm ; 653: 123931, 2024 Mar 25.
Artigo em Inglês | MEDLINE | ID: mdl-38387821

RESUMO

Despite the advances in medicine, wound healing is still challenging and piques the interest of biomedical engineers to design effective wound dressings using natural and artificial polymers. In present study, coaxial electrospinning was employed to fabricate core-shell nanofiber-based wound dressing, with core composed of polyacrylamide (PAAm) and shell comprising 0.5 % solution of L-Arginine (L-Arg) in aloe vera and keratin (AloKr). Aloe vera and keratin were added as natural polymers to promote angiogenesis, reduce inflammation, and provide antibacterial activity, whereas PAAm in core was used to improve the tensile properties of the wound dressing. Moreover, L-Arg was incorporated in shell to promote angiogenesis and collagen synthesis. The fiber diameter of PAAm/(AloKr/L-Arg) core-shell fibers was (93.33 ± 35.11 nm) with finer and straighter fibers and higher water holding capacity due to increased surface area to volume ratio. In terms of tensile properties, the PAAm/(AloKr/L-Arg) core-shell nanofibers with tensile strength and elastic modulus of 2.84 ± 0.27 MPa and 62.15 ± 5.32 MPa, respectively, showed the best mechanical performance compared to other nanofibers tested. Furthermore, PAAm/(AloKr/L-Arg) exhibited the highest L-Arg release (87.62 ± 3.02 %) and viability of L929 cells in vitro compared to other groups. In addition, the highest rate of in vivo full thickness wound healing was observed in PAAm/(AloKr/L-Arg) group compared to other groups. It significantly enhanced the angiogenesis, neovascularization, and cell proliferation. The prepared PAAm/(AloKr/L-Arg) core-shell nanofibrous dressing could be promising for full-thickness wound healing.


Assuntos
Aloe , Nanofibras , 60489 , Cicatrização , Polímeros , Arginina , Queratinas
3.
J Biomater Sci Polym Ed ; 35(6): 823-850, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38300323

RESUMO

Polymethyl methacrylate (PMMA) bone cement is commonly used in orthopedic surgeries to fill the bone defects or fix the prostheses. These cements are usually containing amounts of a nonbioactive radiopacifying agent such as barium sulfate and zirconium dioxide, which does not have a good interface compatibility with PMMA, and the clumps formed from these materials can scratch metal counterfaces. In this work, graphene oxide encapsulated baghdadite (GOBgh) nanoparticles were applied as radiopacifying and bioactive agent in a PMMA bone cement containing 2 wt.% of vancomycin (VAN). The addition of 20 wt.% of GOBgh (GOBgh20) nanoparticles to PMMA powder caused a 33.6% increase in compressive strength and a 70.9% increase in elastic modulus compared to the Simplex® P bone cement, and also enhanced the setting properties, radiopacity, antibacterial activity, and the apatite formation in simulated body fluid. In vitro cell assessments confirmed the increase in adhesion and proliferation of MG-63 cells as well as the osteogenic differentiation of human adipose-derived mesenchymal stem cells on the surface of PMMA-GOBgh20 cement. The chorioallantoic membrane assay revealed the excellent angiogenesis activity of nanocomposite cement samples. In vivo experiments on a rat model also demonstrated the mineralization and bone integration of PMMA-GOBgh20 cement within four weeks. Based on the promising results obtained, PMMA-GOBgh20 bone cement is suggested as an optimal sample for use in orthopedic surgeries.


Assuntos
Cerâmica , Grafite , Nanocompostos , Polimetil Metacrilato , Silicatos , Humanos , Ratos , Animais , Cimentos Ósseos , Vancomicina/farmacologia , Osteogênese , Teste de Materiais
4.
Int J Biol Macromol ; 258(Pt 1): 128482, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38042326

RESUMO

Utilizing electrospun nanofibers and microneedle arrays in wound regeneration has been practiced for several years. Researchers have recently asserted that using multiple methods concurrently might enhance efficiency, despite the inherent strengths and weaknesses of each individual approach. The combination of microneedle arrays with electrospun nanofibers has the potential to create a drug delivery system and wound healing method that offer improved efficiency and accuracy in targeting. The use of microneedles with nanofibers allows for precise administration of pharmaceuticals due to the microneedles' capacity to pierce the skin and the nanofibers' role as a drug reservoir, resulting in a progressive release of drugs over a certain period of time. Electrospun nanofibers have the ability to imitate the extracellular matrix and provide a framework for cellular growth and tissue rejuvenation, while microneedle arrays show potential for enhancing tissue regeneration and enhancing the efficacy of wound healing. The integration of electrospun nanofibers with microneedle arrays may be customized to effectively tackle particular obstacles in the fields of wound healing and drug delivery. However, some issues must be addressed before this paradigm may be fully integrated into clinical settings, including but not limited to ensuring the safety and sterilization of these products for transdermal use, optimizing manufacturing methods and characterization of developed products, larger-scale production, optimizing storage conditions, and evaluating the inclusion of multiple therapeutic and antimicrobial agents to increase the synergistic effects in the wound healing process. This research examines the combination of microneedle arrays with electrospun nanofibers to enhance the delivery of drugs and promote wound healing. It explores various kinds of microneedle arrays, the materials and processes used, and current developments in their integration with electrospun nanofibers.


Assuntos
Nanofibras , Nanofibras/uso terapêutico , Pele , Cicatrização , Polissacarídeos/farmacologia , Sistemas de Liberação de Medicamentos/métodos
5.
Int J Biol Macromol ; 255: 128198, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37992930

RESUMO

Multi-layered wound dressings can closely mimic the hierarchical structure of the skin. Herein, a double-layer dressing material is fabricated through electrospinning, comprised of a nanofibrous structure as a healing-support layer or the bottom layer (BL) containing pectin (Pec), soy protein isolate (SPI), pomegranate peel extract (P), and a cellulose (Cel) microfiber layer as a protective/monitoring layer or top layer (TL). The formation of a fine bilayer structure was confirmed using scanning electron microscopy. Cel/Pec-SPI-P dressing showed a 60.05 % weight loss during 7 days of immersion in phosphate buffered solution. The ultimate tensile strength, elastic modulus, and elongation at break for different dressings were within the range of 3.14-3.57 MPa, 32.26-36.58 MPa, and 59.04-63.19 %, respectively. The release of SPI and phenolic compounds from dressings were measured and their antibacterial activity was evaluated. The fabricated dressing was non-cytotoxic following exposure to human keratinocyte cells. The Cel/Pec-SPI-P dressing exhibited excellent cell adhesion and migration as well as angiogenesis. More importantly, in vivo experiments on Cel/Pec-SPI-P dressings showed faster epidermal layer formation, blood vessel generation, collagen deposition, and a faster wound healing rate. Overall, it is anticipated that the Cel/Pec-SPI-P bilayer dressing facilitates wound treatment and can be a promising approach for clinical use.


Assuntos
Nanofibras , Punica granatum , Humanos , Nanofibras/química , Proteínas de Soja/química , Celulose/química , Pectinas/farmacologia , Cicatrização , Antibacterianos/uso terapêutico , Bandagens , Aceleração
6.
Int J Biol Macromol ; 258(Pt 1): 128917, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38134992

RESUMO

Critical sized craniofacial defects are among the most challenging bone defects to repair, due to the anatomical complexity and aesthetic importance. In this study, a polylactic acid/hardystonite-graphene oxide (PLA/HTGO) scaffold was fabricated through 3D printing. In order to upgrade the 3D printed scaffold to a highly porous scaffold, its channels were filled with pectin-quaternized chitosan (Pec-QCs) polyelectrolyte solution containing 0 or 20 mg/mL of simvastatin (Sim) and then freeze-dried. These scaffolds were named FD and FD-Sim, respectively. Also, similar PLA/HTGO scaffolds were prepared and dip coated with Pec-QCs solution containing 0 or 20 mg/mL of Sim and were named DC and DC-Sim, respectively. The formation of macro/microporous structure was confirmed by morphological investigations. The release of Sim from DC-Sim and FD-Sim scaffolds after 28 days was measured as 77.40 ± 5.25 and 86.02 ± 3.63 %, respectively. Cytocompatibility assessments showed that MG-63 cells had the highest proliferation, attachment and spread on the Sim containing scaffolds, especially FD-Sim. In vivo studies on a rat calvarial defect model revealed that an almost complete recovery occurred in the group treated with FD-Sim scaffold after 8 weeks and the defect was filled with newly formed bone. The results of this study acknowledge that the FD-Sim scaffold can be a perfect candidate for calvarial defect repair.


Assuntos
Quitosana , Grafite , Sinvastatina , Ratos , Animais , Tecidos Suporte/química , Polieletrólitos , Regeneração Óssea , Osteogênese , Poliésteres , Impressão Tridimensional , Engenharia Tecidual
7.
ACS Appl Mater Interfaces ; 15(48): 55276-55286, 2023 Dec 06.
Artigo em Inglês | MEDLINE | ID: mdl-37990423

RESUMO

To overcome the drawbacks of single-layered wound dressings, bilayer dressings are now introduced as an alternative to achieve effective and long-term treatment. Here, a bilayer dressing composed of electrospun nanofibers in the bottom layer (BL) and a sponge structure as the top layer (TL) is presented. Hydrophilic poly(acrylic acid) (PAAc)-honey (Hny) with interconnected pores of 76.04 µm was prepared as the TL and keratin (Kr), Hny, and vascular endothelial growth factor (VEGF) were prepared as the BL. VEGF indicates a gradual release over 7 days, promoting angiogenesis, as proven by the chick chorioallantoic membrane assay and in vivo tissue histomorphology observation. Additionally, the fabricated dressing material indicated a satisfactory tensile profile, cytocompatibility for human keratinocyte cells, and the ability to promote cell attachment and migration. The in vivo animal model demonstrated that the full-thickness wound healed faster when it was covered with PAAc-Hny/Hny-Kr-VEGF than in other groups. Additionally, faster blood vessel formation, collagen synthetization, and epidermal layer generation were also confirmed, which have proven efficient healing acceleration in wounds treated with synthesized bilayer dressings. Our findings indicated that the fabricated material can be promising as a functional wound dressing.


Assuntos
Mel , Nanofibras , Animais , Humanos , Fator A de Crescimento do Endotélio Vascular/farmacologia , Fator A de Crescimento do Endotélio Vascular/metabolismo , Queratinas/farmacologia , Cicatrização , Bandagens
8.
Heliyon ; 9(11): e21621, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37954292

RESUMO

Among many types of wearable sensors, MOFs-based wearable sensors have recently been explored in both commercialization and research. There has been much effort in various aspects of the development of MOF-based wearable sensors including but not limited to miniaturization, size control, safety, improvements in conformal and flexible features, improvements in the analytical performance and long-term storage of these devices. Recent progress in the design and deployment of MOFs-based wearable sensors are covered in this paper, as are the remaining obstacles and prospects. This work also highlights the enormous potential for synergistic effects of MOFs used in combination with other nanomaterials for healthcare applications and raise attention toward the economic aspect and market diffusion of MOFs-based wearable sensors.

9.
Int J Biol Macromol ; 253(Pt 2): 126700, 2023 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-37673152

RESUMO

In the current study, a core-shell nanofibrous wound dressing based on Pluronic-F127 (F127) containing 2 wt% mupirocin (Mup) core and pectin (Pec)-keratin (Kr) shell was fabricated through coaxial electrospinning technique, and the blended nanofibers were also fabricated from the same materials. The fiber diameter and specific surface area of the blended nanofibers were about 101.56 nm and 20.16 m2/g, while for core-shell nanofibers they were about 97.32 nm and 25.26 m2/g, respectively. The resultant blended and core-shell nanofibers experienced a degradation of 27.65 % and 32.28 % during 7 days, respectively. The drug release profile of core-shell nanofibers revealed a sustained release of Mup over 7 days (87.66 %), while the blended F127-Pec-Kr-Mup nanofibers had a burst release within the first few hours (89.38 % up to 48 h) and a cumulative release of 91.36 % after 7 days. Due to the controlled release of Mup, the core-shell structure significantly improved the human keratinocytes behavior, angiogenic potential and wound healing in a rat model compared to the blended structure. In conclusion, the F127-Mup/Pec-Kr core-shell nanofibrous wound dressing appears to be a promising candidate for the prevention of infection, and can potentially accelerate the recovery and healing of chronic and ischemic wounds.


Assuntos
Mupirocina , Nanofibras , Humanos , Ratos , Animais , Mupirocina/farmacologia , Nanofibras/química , Poloxâmero , Queratinas , Pectinas/farmacologia , Cicatrização , Queratinócitos
10.
Int J Pharm ; 645: 123357, 2023 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-37647978

RESUMO

A multi-layered scaffold can mimic the hierarchical structure of the skin, accelerate the wound healing, and protect the skin against contamination and infection. In this study, a three-layered (3L) scaffold was manufactured through a combination of 3D printing and electrospinning technique. A top layer of polyurethane (PU) nanofibrous coating for the prevention of micro-organism penetration was created through electrospining. The middle layer was prepared through the 3D printing of Pluronic F127-quaternized chitosan-silver nitrate nanoparticles (F127-QCS-AgNO3), as the porous absorbent and antibacterial layer. A bottom layer of core-shell nanofibrous structure of F127-mupirocin/pectin-keratin (F127-Mup/Pec-Kr) for tissue regeneration and enable antibacterial activity was coated onto the middle layer. A range of techniques were applied to fully characterize the resultant structure. The average tensile strength and elastic modulus of the 3L scaffold were measured as 0.65 ± 0.08 MPa and 9.37 ± 2.33 MPa, respectively. The release of Ag ions, mupirocin (Mup), and the antibacterial activity of the dressings was investigated. According to the results, the highest rate of cell adhesion and viability, and angiogenic potential among the studied samples were related to the 3L scaffold, which was also found to significantly accelerate the wound healing.


Assuntos
Quitosana , Nanofibras , Mupirocina , Tecidos Suporte/química , Cicatrização , Antibacterianos/farmacologia , Antibacterianos/química , Quitosana/química , Impressão Tridimensional , Nanofibras/química
11.
Front Nutr ; 10: 1145762, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37476400

RESUMO

Background: Ultra-processed foods (UPF) consumption may affect the risk of PCAD through affecting cardio metabolic risk factors. This study aimed to evaluate the association between UPFs consumption and premature coronary artery disease (PCAD). Methods: A case-control study was conducted on 2,354 Iranian adults (≥ 19 years). Dietary intake was assessed using a validated 110-item food frequency questionnaire (FFQ) and foods were classified based on the NOVA system, which groups all foods according to the nature, extent and purposes of the industrial processes they undergo. PCAD was defined as having an stenosis of at least single coronary artery equal and above 75% or left main coronary of equal or more than 50% in women less than 70 and men less than 60 years, determined by angiography. The odds of PCAD across the tertiles of UPFs consumption were assessed by binary logistic regression. Results: After adjustment for potential confounders, participants in the top tertile of UPFs were twice as likely to have PCAD compared with those in the bottom tertile (OR: 2.52; 95% CI: 1.97-3.23). Moreover, those in the highest tertile of the UPFs consumption had more than two times higher risk for having severe PCAD than those in the first tertile (OR: 2.64; 95% CI: 2.16-3.22). In addition, there was a significant upward trend in PCAD risk and PCAD severity as tertiles increased (P-trend < 0.001 for all models). Conclusion: Higher consumption of UPFs was related to increased risk of PCAD and higher chance of having severe PCAD in Iranian adults. Although, future cohort studies are needed to confirm the results of this study, these findings indicated the necessity of reducing UPFs intake.

12.
Biomed Pharmacother ; 165: 115078, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37390707

RESUMO

Physical exercise has beneficial effects on adult hippocampal neurogenesis (AHN) and cognitive processes, including learning. Although it is not known if anaerobic resistance training and high-intensity interval training, which involve alternating brief bouts of highly intense anaerobic activity with rest periods, have comparable effects on AHN. Also, while less thoroughly investigated, individual genetic diversity in the overall response to physical activity is likely to play a key role in the effects of exercise on AHN. Physical exercise has been shown to improve health on average, although the benefits may vary from person to person, perhaps due to genetic differences. Maximal aerobic capacity and metabolic health may improve significantly with aerobic exercise for some people, while the same amount of training may have little effect on others. This review discusses the AHN's capability for peripheral nervous system (PNS) regeneration and central nervous system (CNS) control via physical exercise. Exercise neurogenicity, effective genes, growth factors, and the neurotrophic factors involved in PNS regeneration and CNS control were discussed. Also, some disorders that could be affected by AHN and physical exercise are summarized.


Assuntos
Exercício Físico , Neurogênese , Humanos , Adulto , Neurogênese/fisiologia , Regeneração Nervosa , Sistema Nervoso Central , Hipocampo/metabolismo
13.
Eur J Neurol ; 30(9): 2919-2945, 2023 09.
Artigo em Inglês | MEDLINE | ID: mdl-37209042

RESUMO

BACKGROUND: Since the results of previous studies regarding the safety and efficacy of miglustat in GM2 gangliosidosis (GM2g) were inconsistent, we aimed to assess miglustat therapy in GM2g patients. METHODS: This study followed the latest version of PRISMA. We included the observational or interventional studies reporting GM2g patients under miglustat therapy by searching PubMed, Web of Science, and Scopus. Data extracted included the natural history of individual patient data, as well as the safety and efficacy of miglustat in GM2g patients. The quality assessment was performed using the Joanna Briggs Institute Critical Appraisal checklist. RESULTS: A total of 1023 records were identified and reduced to 621 after removing duplicates. After screening and applying the eligibility criteria, 10 articles and 2 abstracts met the inclusion criteria. Overall, the studies represented 54 patients with GM2g under treatment with miglustat and 22 patients with GM2g in the control group. Among patients with available data, 14 and 54 have been diagnosed with Sandhoff disease and Tay-Sachs disease, respectively. Patients included in this review consisted of 23 infantile, 4 late-infantile, 18 juvenile, and 31 adult-onset GM2g. CONCLUSIONS: Although miglustat should not be considered a definite treatment for GM2g, it appears that patients, particularly those with infantile or late-infantile GM2g, could benefit from miglustat therapy to some extent. We also make some suggestions regarding future studies presenting their findings in a standard format to facilitate pooling the available data in such rare diseases for a more comprehensive conclusion.


Assuntos
Gangliosidoses GM2 , Adulto , Humanos , Gangliosidoses GM2/tratamento farmacológico , 1-Desoxinojirimicina/efeitos adversos
14.
World J Pediatr ; 19(4): 356-365, 2023 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-36484872

RESUMO

BACKGROUND: Recently, beneficial effects of probiotics and/or prebiotics on cardio-metabolic risk factors in adults have been shown. However, existing evidence has not been fully established for pediatric age groups. This study aimed to assess the effect of synbiotic on anthropometric indices and body composition in overweight or obese children and adolescents. METHODS: This randomized double-blind, placebo-controlled trial was conducted among 60 participants aged 8-18 years with a body mass index (BMI) equal to or higher than the 85th percentile. Participants were randomly divided into two groups that received either a synbiotic capsule containing 6 × 109 colony forming units (CFU) Lactobacillus coagulans SC-208, 6 × 109 CFU Lactobacillus indicus HU36 and fructooligosaccharide as a prebiotic (n = 30) or a placebo (n = 30) twice a day for eight weeks. Anthropometric indices and body composition were measured at baseline and after the intervention. RESULTS: The mean (standard deviation, SD) age was 11.07 (2.00) years and 11.23 (2.37) years for the placebo and synbiotic groups, respectively (P = 0.770). The waist-height ratio (WHtR) decreased significantly at the end of the intervention in comparison with baseline in the synbiotic group (0.54 ± 0.05 vs. 0.55 ± 0.05, P = 0.05). No significant changes were demonstrated in other anthropometric indices or body composition between groups. CONCLUSIONS: Synbiotic supplementation might be associated with a reduction in WHtR. There were no significant changes in other anthropometric indices or body composition.


Assuntos
Obesidade Pediátrica , Probióticos , Simbióticos , Adulto , Humanos , Criança , Adolescente , Sobrepeso/terapia , Obesidade Pediátrica/terapia , Probióticos/uso terapêutico , Prebióticos , Método Duplo-Cego , Composição Corporal
15.
Int J Biol Macromol ; 217: 270-281, 2022 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-35760164

RESUMO

A drug delivery system (DDSs) was developed in the present study based on textile substrates as drug carriers and electrospun nanofibers as a controller of release rate. Three types of drugs consisting of ciprofloxacin (CIP), clotrimazole (CLO), and benzalkonium chloride (BEN) were loaded into the cover glass (CG) and cotton fabrics (CF1 and CF2) separately. Then, the drug-loaded substrates were coated with polycaprolactone (PCL) and polycaprolactone/gelatin (PCL/Gel) nanofibers with various thicknesses. The morphology and hydrophilicity of the electrospun nanofibers and the release profile of drug-loaded samples were investigated. FTIR, XRD, and in vitro biodegradability analysis were analyzed to characterize the drug delivery system. A morphological study of electrospun fibers showed the mean diameter of the PCL and PCL/Gel nanofibers 127 ± 25 and 178 ± 38 nm, respectively. The drug delivery assay revealed that various factors affect the rate of drug releases, such as the type of drug, the type of drug carrier, and the thickness of the covered nanofibers. The study highlights the ability of drugs to load substrates with coated nanofibers as controlled drug delivery systems. In conclusion, it is shown that the obtained samples are excellent candidates for future wound dressing applications.


Assuntos
Nanofibras , Bandagens , Liberação Controlada de Fármacos , Gelatina/química , Nanofibras/química , Poliésteres/química , Têxteis
16.
Polymers (Basel) ; 14(3)2022 Jan 25.
Artigo em Inglês | MEDLINE | ID: mdl-35160462

RESUMO

Several experimental and numerical studies have been conducted to address the structural performance of FRP-reinforced/strengthened concrete structures under and after exposure to elevated temperatures. The present paper reviews over 100 research studies focused on the structural responses of different FRP-reinforced/strengthened concrete structures after exposure to elevated temperatures, ranging from ambient temperatures to flame. Different structural systems were considered, including FRP laminate bonded to concrete, FRP-reinforced concrete, FRP-wrapped concrete, and concrete-filled FRP tubes. According to the reported data, it is generally accepted that, in the case of insignificant resin in the post curing process, as the temperature increases, the ultimate strength, bond strength, and structure stiffness reduce, especially when the glass transition temperature Tg of the resin is approached and exceeded. However, in the case of post curing, resin appears to preserve its mechanical properties at high temperatures, which results in the appropriate structural performance of FRP-reinforced/strengthened members at high temperatures that are below the resin decomposition temperature Td. Given the research gaps, recommendations for future studies have been presented. The discussions, findings, and comparisons presented in this review paper will help designers and researchers to better understand the performance of concrete structures that are reinforced/strengthened with FRPs under elevated temperatures and consider appropriate approaches when designing such structures.

17.
Biomolecules ; 12(2)2022 01 18.
Artigo em Inglês | MEDLINE | ID: mdl-35204654

RESUMO

Chitosan is a biopolymer that is found in nature and is produced from chitin deacetylation. Chitosan has been studied thoroughly for multiple applications with an interdisciplinary approach. Antifungal antibacterial activities, mucoadhesion, non-toxicity, biodegradability, and biocompatibility are some of the unique characteristics of chitosan-based biomaterials. Moreover, chitosan is the only widely-used natural polysaccharide, and it is possible to chemically modify it for different applications and functions. In various fields, chitosan composite and compound manufacturing has acquired much interest in developing several promising products. Chitosan and its derivatives have gained attention universally in biomedical and pharmaceutical industries as a result of their desired characteristics. In the present mini-review, novel methods for preparing chitosan-containing materials for dental and implant engineering applications along with challenges and future perspectives are discussed.


Assuntos
Quitosana , Materiais Biocompatíveis/química , Biopolímeros , Quitina/química , Quitosana/química , Odontologia , Engenharia Tecidual/métodos
18.
Biomed Mater ; 17(1)2021 12 24.
Artigo em Inglês | MEDLINE | ID: mdl-34891145

RESUMO

The second cause of death in the world has been reported to be cancer, and it has been on the rise in recent years. As a result of the difficulties of cancer detection and its treatment, the survival rate of patients is unclear. The early detection of cancer is an important issue for its therapy. Cancer detection based on biomarkers may effectively enhance the early detection and subsequent treatment. Nanomaterial-based nanobiosensors for cancer biomarkers are excellent tools for the molecular detection and diagnosis of disease. This review reports the latest advancement and attainment in applying nanoparticles to the detection of cancer biomarkers. In this paper, the recent advances in the application of common nanomaterials like graphene, carbon nanotubes, Au, Ag, Pt, and Fe3O4together with newly emerged nanoparticles such as quantum dots, upconversion nanoparticles, inorganics (ZnO, MoS2), and metal-organic frameworks for the diagnosis of biomarkers related to lung, prostate, breast, and colon cancer are highlighted. Finally, the challenges, outlook, and closing remarks are given.


Assuntos
Técnicas Biossensoriais , Nanotubos de Carbono , Neoplasias , Brônquios , Colo , Humanos , Pulmão , Masculino , Nanotecnologia , Próstata
19.
Carbohydr Polym ; 273: 118631, 2021 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-34561021

RESUMO

Over the last years, chitosan has demonstrated unparalleled characteristics for regenerative medicine applications. Beside excellent antimicrobial and wound healing properties, this polysaccharide biopolymer offers favorable characteristics such as biocompatibility, biodegradability, and film and fiber-forming capabilities. Having plentiful active amine groups, chitosan can be also readily modified to provide auxiliary features for growing demands in regenerative medicine, which is constantly confronted with new problems, necessitating the creation of biocompatible, immunogenic and biodegradable film/scaffold composites. A new look at the chitosan composites structure/activity/application tradeoff is the primary focus of the current review, which can help researchers to detect the bottlenecks and overcome the shortcomings that arose from this intersection. In the current review, the most recent advances in chitosan films and scaffolds in terms of preparation techniques and modifying methods for improving their functional properties, in three major biomedical fields i.e., tissue engineering, wound healing, and drug delivery are surveyed and discussed.


Assuntos
Quitosana/farmacologia , Tecidos Suporte/química , Animais , Antibacterianos/química , Antibacterianos/farmacologia , Bactérias/efeitos dos fármacos , Quitosana/análogos & derivados , Portadores de Fármacos/química , Portadores de Fármacos/farmacologia , Humanos , Nanocompostos/química , Medicina Regenerativa , Engenharia Tecidual , Cicatrização/efeitos dos fármacos
20.
Carbohydr Polym ; 258: 117680, 2021 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-33593554

RESUMO

The bioactive glasses (BGs)/Cisplatin and magnetic bioactive glasses (MBGs)/Cisplatin were doped into the chitosan (CS)-grafted- poly (ε-caprolactone) (PCL) nanofibers for controlled release of Cisplatin under various pH values and temperatures. The simultaneous effect of chemotherapy and hyperthermia was investigated against MG-63 osteosarcoma cells by treating of cells with Cs-g-PCL/MBGs/Cisplatin under an alternating magnetic field. The synthesized nanofibers were characterized using XRD, FTIR, 1H NMR, SEM, and EDX analysis. The bioactivity, and drug loading efficiency of fibers were investigated. There was no initial burst release of Cisplatin from BGs/Cisplatin and MBGs/Cisplatin loaded Cs-g-PCL/MBGs nanofibers and the Cisplatin release rate was accelerated under pH of 5.5 and temperature of 43 °C compared with physiological condition. The apoptotic/necrotic effect indicated that 100 µg mL-1 nanofibers was optimum for killing of MG-63 cells. The future researches could be focused on the application of nanofibers as an implantable device next to a bone tumor for bone cancer therapy in vivo.


Assuntos
Antineoplásicos/administração & dosagem , Neoplasias Ósseas/tratamento farmacológico , Quitosana/química , Cisplatino/farmacologia , Nanofibras/química , Poliésteres/química , Fosfatase Alcalina/química , Apoptose , Caproatos , Linhagem Celular Tumoral , Sobrevivência Celular , Cisplatino/química , Portadores de Fármacos/química , Sistemas de Liberação de Medicamentos , Liberação Controlada de Fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Vidro , Humanos , Lactonas , Espectroscopia de Ressonância Magnética , Microscopia Eletrônica de Varredura , Nanopartículas/química , Necrose , Engenharia Tecidual , Tecidos Suporte/química , Difração de Raios X
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