共查询到20条相似文献,搜索用时 11 毫秒
1.
《国际聚合物材料杂志》2012,61(13):675-682
The aim of this work was to prepare the scaffolds of pure poly (L-lactic acid) 3% (w/v), pure chitosan 3% (w/v), and PLLA/chitosan blend (1:5) 3% (w/v) using TIPS method and investigate their properties and application in tissue engineering. An in vitro degradation study of scaffolds showed the addition of chitosan to PLLA not only increased its degradation rate, but also slowed down its pH value reduction. Addition of chitosan to PLLA increased hydrophilicity, porosity, compressive properties, and cell viability of the scaffolds. The results indicate that among all scaffolds, the most appropriate candidate for tissue engineering is PLLA/chitosan blend. 相似文献
2.
总结了近年来国内外关于聚羟基丁酸酯(PHB)和聚羟基丁酸酯-co-羟基戊酸酯共聚物(PHBV)在增韧和增塑改性方面的研究进展。通过应力-应变行为和冲击强度等性能指标,对弹性体、酚类化合物、反应性增韧、超高相对分子质量聚乙二醇、淀粉、羟基烷酸酯、热处理等增韧改性方法和效果、改性产物进行了评述;通过熔点、玻璃化转变温度、冷结晶温度等性能指标,对共聚改性、中小相对分子质量聚乙二醇、环氧大豆油等增塑剂增塑改性方法、效果以及改性产物进行了详细介绍。最后对PHB和PHBV生物降解材料的发展前景进行了展望。 相似文献
3.
骨组织工程用PLGA多孔支架的制备及细胞毒性研究 总被引:6,自引:0,他引:6
制备能在骨组织工程研究中应用,并具有良好孔隙结构的块状聚(D,L-乳酸-CO-乙醇酸)(PLGA)多孔支架,探索出以冰粒子作为致孔剂,采用粒子滤出方法结合冷冻干燥工艺制备多孔支架的方法.首先将冰颗粒加入预冻的PLGA氯仿溶液中混合均匀,然后把混合物置于液氮中深度冷冻后冷冻干燥,制得多孔支架.对支架孔隙结构分析表明,该工艺制备的多孔支架无致孔剂残留、三维结构良好、孔径与孔隙可通过改变冰粒子的粒径和质量分数来控制;细胞毒性实验表明该多孔支架毒性在0~1级,可作为骨组织工程研究用多孔支架. 相似文献
4.
《国际聚合物材料杂志》2012,61(10):510-517
A completely organic solvent-free fabrication method is developed for tissue engineering scaffolds by gas foaming of immiscible polylactic acid (PLA) and sucrose blends, followed by water leaching. PLA scaffolds with above 90% porosity and 25–200 µm pore size were fabricated. The pore size and porosity was controlled with process parameters including extrusion temperature and foaming process parameters. Dynamic mechanical analysis showed that the extrusion temperature could be used to control the scaffold strength. Both unfoamed and foamed scaffolds were used to culture glioblastoma (GBM) cells M059 K. The results showed that the cells grew better in the foamed PLA scaffolds. The method presented in the paper is versatile and can be used to fabricate tissue engineering scaffolds without any residual organic solvents. 相似文献
5.
6.
This study was designed to determine whether the surface modifications of the various poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) [P(3HB‐co‐4HB)] copolymer scaffolds fabricated would enhance mouse fibroblast cells (L929) attachment and proliferation. The P(3HB‐co‐4HB) copolymer with a wide range of 4HB monomer composition (16–91 mol %) was synthesized by a local isolate Cupriavidus sp. USMAA1020 by employing the modified two‐stage cultivation and by varying the concentrations of 4HB precursors, namely γ‐butyrolactone and 1,4‐butanediol. Five different processing techniques were used in fabricating the P(3HB‐co‐4HB) copolymer scaffolds such as solvent casting, salt‐leaching, enzyme degradation, combining salt‐leaching with enzyme degradation, and electrospinning. The increase in 4HB composition lowered melting temperatures (Tm) but increased elongation to break. P(3HB‐co‐91 mol % 4HB) exhibited a melting point of 46°C and elongation to break of 380%. The atomic force analysis showed an increase in the average surface roughness as the 4HB monomer composition increased. The mouse fibroblasts (L929) cell attachment was found to increase with high 4HB monomer composition in copolymer scaffolds. These results illustrate the importance of a detailed characterization of surface architecture of scaffolds to provoke specific cellular responses. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
7.
8.
Mario Ledda Miriam Merco Antonio Sciortino Elisa Scatena Annalisa Convertino Antonella Lisi Costantino Del Gaudio 《International journal of molecular sciences》2022,23(10)
The scaffold is a key element in the field of tissue engineering, especially when large defects or substitutions of pathological tissues or organs need to be clinically addressed. The expected outcome is strongly dependent on the cell–scaffold interaction and the integration with the surrounding biological tissue. Indeed, mimicking the natural extracellular matrix (ECM) of the tissue to be healed represents a further optimization that can limit a possible morphological mismatch between the scaffold and the tissue itself. For this aim, and referring to bone tissue engineering, polylactic acid (PLA) scaffolds were 3D printed with a microstructure inspired by the trabecular architecture and biologically evaluated by means of human osteosarcoma SAOS-2 cells. The cells were seeded on two types of scaffolds differing for the designed pore size (i.e., 400 and 600 µm), showing the same growth exponential trend found in the control and no significant alterations in the actin distribution. The microporous structure of the two tested samples enhanced the protein adsorption capability and mRNA expression of markers related to protein synthesis, proliferation, and osteoblast differentiation. Our findings demonstrate that 3D-printed scaffolds support the adhesion, growth, and differentiation of osteoblast-like cells and the microporous architecture, mimicking the natural bone hierarchical structure, and favoring greater bioactivity. These bioinspired scaffolds represent an interesting new tool for bone tissue engineering and regenerative medicine applications. 相似文献
9.
Pawe Piszko Marcin Wodarczyk Sonia Zieliska Magorzata Gaziska Przemysaw Pociski Karolina Rudnicka Aleksandra Szwed Agnieszka Krupa Micha Grzymajo Agnieszka Sobczak-Kupiec Dagmara Sota Magdalena Kobielarz Magdalena Wojtkw Konrad Szustakiewicz 《International journal of molecular sciences》2021,22(16)
In this research, we synthesize and characterize poly(glycerol sebacate) pre-polymer (pPGS) (1H NMR, FTiR, GPC, and TGA). Nano-hydroxyapatite (HAp) is synthesized using the wet precipitation method. Next, the materials are used to prepare a PGS-based composite with a 25 wt.% addition of HAp. Microporous composites are formed by means of thermally induced phase separation (TIPS) followed by thermal cross-linking (TCL) and salt leaching (SL). The manufactured microporous materials (PGS and PGS/HAp) are then subjected to imaging by means of SEM and µCT for the porous structure characterization. DSC, TGA, and water contact angle measurements are used for further evaluation of the materials. To assess the cytocompatibility and biological potential of PGS-based composites, preosteoblasts and differentiated hFOB 1.19 osteoblasts are employed as in vitro models. Apart from the cytocompatibility, the scaffolds supported cell adhesion and were readily populated by the hFOB1.19 preosteoblasts. HAp-facilitated scaffolds displayed osteoconductive properties, supporting the terminal differentiation of osteoblasts as indicated by the production of alkaline phosphatase, osteocalcin and osteopontin. Notably, the PGS/HAp scaffolds induced the production of significant amounts of osteoclastogenic cytokines: IL-1β, IL-6 and TNF-α, which induced scaffold remodeling and promoted the reconstruction of bone tissue. Initial biocompatibility tests showed no signs of adverse effects of PGS-based scaffolds toward adult BALB/c mice. 相似文献
10.
11.
Kyu Yong Choi Carla V. Luciani Laleh Emdadi Sang Yool Lee In Hak Baick Jong Sung Lim 《大分子材料与工程》2012,297(10):1021-1027
Spherical silica particles with pseudo‐inverse opal structure are synthesized by using pomegranate‐like polymer microparticles as templates. A micro‐dispersion polymerization occurring in the suspended monomer droplets in the presence of a silica precursor leads to the formation of nearly monodisperse polymer sub‐particles of about 1 µm size, randomly‐packed within a 30–100 µm polymer particle. The polymerization is followed by an acid‐catalyzed reaction that induces formation of silica in the interstices between the sub‐particles within a polymer particle. Spherical PIOS particles are eventually produced by selectively removing the polymer template by pyrolysis. The PIOS particles show large specific surface areas with unique pore geometry and pore size distribution.
12.
《大分子材料与工程》2017,302(5)
Poly(ethylene glycol) diacrylate (PEG‐DA) hydrogels have been widely utilized to investigate cell–material interactions and as scaffolds for tissue engineering. Traditionally, PEG‐DA hydrogels are prepared via the UV‐cure of aqueous precursor solutions, but afford a limited range of pore size and interconnectivity that is essential for cellular proliferation and neotissue formation. To overcome these limitations, macroporous PEG‐DA hydrogels are prepared in this study using a combination of solvent‐induced phase separation (SIPS) and a fused salt template. PEG‐DA concentration in the organized fabrication solvent (20, 30, and 40 wt%) and average salt particle size (≈180, ≈270, and ≈460 μm) are varied and the resulting hydrated hydrogel morphology, swelling, mechanical properties, and degradation are characterized. These templated SIPS PEG‐DA hydrogels broaden PEG‐DA hydrogel properties and, in some cases, afford a series of compositions whose properties are decoupled.
13.
14.
15.
Mohan Vedhanayagam Iruthayapandi Selestin Raja Anara Molkenova Timur Sh. Atabaev Kalarical Janardhanan Sreeram Dong-Wook Han 《International journal of molecular sciences》2021,22(10)
Regeneration of damaged tissues or organs is one of the significant challenges in tissue engineering and regenerative medicine. Many researchers have fabricated various scaffolds to accelerate the tissue regeneration process. However, most of the scaffolds are limited in clinical trials due to scaffold inconsistency, non-biodegradability, and lack of non-invasive techniques to monitor tissue regeneration after implantation. Recently, carbon dots (CDs) mediated fluorescent scaffolds are widely explored for the application of image-guided tissue engineering due to their controlled architecture, light-emitting ability, higher chemical and photostability, excellent biocompatibility, and biodegradability. In this review, we provide an overview of the recent advancement of CDs in terms of their different synthesis methods, tunable physicochemical, mechanical, and optical properties, and their application in tissue engineering. Finally, this review concludes the further research directions that can be explored to apply CDs in tissue engineering. 相似文献
16.
Frederico Barbosa Frederico Castelo Ferreira Joo Carlos Silva 《International journal of molecular sciences》2022,23(6)
Osteochondral tissue (OCT) related diseases, particularly osteoarthritis, number among the most prevalent in the adult population worldwide. However, no satisfactory clinical treatments have been developed to date to resolve this unmet medical issue. Osteochondral tissue engineering (OCTE) strategies involving the fabrication of OCT-mimicking scaffold structures capable of replacing damaged tissue and promoting its regeneration are currently under development. While the piezoelectric properties of the OCT have been extensively reported in different studies, they keep being neglected in the design of novel OCT scaffolds, which focus primarily on the tissue’s structural and mechanical properties. Given the promising potential of piezoelectric electrospun scaffolds capable of both recapitulating the piezoelectric nature of the tissue’s fibrous ECM and of providing a platform for electrical and mechanical stimulation to promote the regeneration of damaged OCT, the present review aims to examine the current state of the art of these electroactive smart scaffolds in OCTE strategies. A summary of the piezoelectric properties of the different regions of the OCT and an overview of the main piezoelectric biomaterials applied in OCTE applications are presented. Some recent examples of piezoelectric electrospun scaffolds developed for potentially replacing damaged OCT as well as for the bone or articular cartilage segments of this interfacial tissue are summarized. Finally, the current challenges and future perspectives concerning the use of piezoelectric electrospun scaffolds in OCT regeneration are discussed. 相似文献
17.
George Flamourakis Ioannis Spanos Zacharias Vangelatos Phanee Manganas Lina Papadimitriou Costas Grigoropoulos Anthi Ranella Maria Farsari 《大分子材料与工程》2020,305(7)
Exploiting the unique properties of three‐dimensional (3D) auxetic scaffolds in tissue engineering and regenerative medicine applications provides new impetus to these fields. Herein, the results on the fabrication and characterization of 3D auxetic scaffolds for tissue engineering applications are presented. The scaffolds are based on the well‐known re‐entrant hexagonal geometry (bowtie) and they are fabricated by multiphoton lithography using the organic?inorganic photopolymer SZ2080. In situ scanning electron microscopy–microindentations and nanoindention experiments are employed to characterize the photocurable resin SZ2080 and the scaffolds fabricated with it. Despite SZ2080 being a stiff material with a positive Poisson’s ratio, the scaffolds exhibit a negative Poisson’s ratio and high elasticity due to their architecture. Next, mouse fibroblasts are used to seed the scaffolds, showing that they can readily penetrate them and proliferate in them, adapting the scaffold shape to suit the cells’ requirements. Moreover, the scaffold architecture provides the cells with a predilection to specific directions, an imperative parameter for regenerative medicine in many cell‐based applications. This research paves the way for the utility of 3D auxetic metamaterials as the next‐generation adaptable scaffolds for tissue engineering. 相似文献
18.
《国际聚合物材料杂志》2012,61(18):969-977
Highly conductive polypyrrole/graphene (PYG) nanocomposite was synthesized with chemical oxidation process via emulsion polymerization and used for the preparation of novel porous conductive gelatin/chitosan-based scaffolds. The effect of PYG loading on various properties of scaffolds was investigated. The obtained results indicated that by introducing PYG into the polymeric matrix, the porosity and swelling capacity decreased while electrical conductivity and Young's modulus demonstrated increasing trend. The in vitro biodegradation test revealed that pure gelatin/chitosan matrix lost 80% of its weight after six weeks in the presence of lysozyme whilst the biodegradation rate was significantly lower for the conductive scaffolds. Furthermore, Schwann cell attachment and proliferation were evaluated by MTT assay and SEM image and the results revealed significant cell biocompatibility of the conductive scaffold with low amount of PYG. The results confirmed the potential of gelatin/chitosan/PYG compounding as a suitable biomaterial for using in nerve tissue engineering applications in which electrical stimulation plays a vital role. 相似文献
19.
《国际聚合物材料杂志》2012,61(13):672-679
The purpose of this investigation was to develop the feasibility of utilizing Angelica polysaccharide in vascular tissue engineering area. Angelica polysaccharide and poly lactic acid (PLA) microfibrous mixed in different ratios were prepared with electrospinning apparatus. A series of detection technology (SEC-LLS, SEM, MTT, paraffin sections, mechanical test) was used to characterize and determine the property of composite scaffold such as molecular weight, biomechanical, bioactivity, cytotoxicity, biocompatibility, and biodegradability. The scaffolds exhibited similar mechanical property to the native tissues, possessed good biological compatibility and decreased platelet adhesion/aggregation rate. All these showed the excellent potentiality of Angelica polysaccharide in vascular tissue engineering. 相似文献
20.
Patrícia S. Calvão Jean‐Marc Chenal Catherine Gauthier Nicole R. Demarquette Agnès Bogner Jean Yves Cavaille 《Polymer International》2012,61(3):434-441
In this work poly(hydroxybutyrate/poly(vinyl butyral)‐ co‐(vinyl alcohol)‐co(vinyl acetate) (or ethylene propylene diene monomer rubber) blends were prepared by conventional processing techniques (extrusion and injection moulding). A droplet type morphology was obtained for P(3HB)/PVB blends whereas P(3HB)/EPDM blends presented some extent of co‐continuous morphology. In addition, rubbery domains were much smaller in the case of PVB. These differences in morphology are discussed taking into account solubility parameters and rheological behaviours of each component. For both blends, the increase of elastomer ratio led to a decrease of Young's modulus but an increase in elongation at break and impact strength. The latter increased more in the case of P(3HB)/EPDM blends although the rubbery domains were larger. These results are explained in the light of the glass transition of the rubber and the presence of plasticizer in the case of PVB. The addition of elastomer also resulted in an increase of P(3HB) biodegradation rate, especially in the case of EPDM. It is assumed that, in this case, the size and morphology of the rubbery domains induce a geometrical modification of the ‘erosion front’ which leads to an increase of the interface between P(3HB) phase and the degradation medium and consequently to an apparently faster biodegradation kinetics of PHB/rubber blends. Copyright © 2011 Society of Chemical Industry 相似文献