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Synergistic effects of surface grafting with heparin and addition of poly(d,l-lactide) microparticles on properties of poly(l-lactide) single crystals scaffolds

机译:用肝素与肝素表面移植的协同作用,加入聚(D,L-丙交酯)微粒对聚(L-丙交酯)单晶支架的性能

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Mixtures of heparin grafted poly(l-lactide) single crystals (Hep-PLLA(sc)) and poly(d,l-lactide) (PDLLA) microparticles are used for assembling hydrophilic and cytocompatible three-dimensional tissue engineering scaffolds simply by compression molding/salt leaching technique. PLLA is grafted with heparin to promote its surface cytocompatability, while PDLLA is added to reinforce the scaffolds. PLLA(sc) are aminolyzed with tetraethylenepentamine (13-atom spacer) to generate sterically accessible amino groups at the surface allowing the covalent attachment of heparin by aqueous carbodiimide chemistry. Morphological and compressive strength studies manifest the integrity and compactness of scaffolds. Toluidine blue assay assures the consistency of heparin distribution throughout the scaffolds, which is in contrary to the conventional grafting reactions by immersing the scaffold in heparin solution. The scaffolds applicability is examined by fibroblast cells seeding experiments. Contrary to pristine scaffolds, Hep-PLLA(sc) scaffolds display a hydrophilic and cytocompatible interface for cell adhesion, spreading, growth, and migration. Therefore, combining presurface grafted PLLA(sc) with PDLLA microparticles could offer durable scaffolds exhibiting bioactive interface and controllable spatial distribution of the grafted biomacromolecules. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47797.
机译:肝素接枝聚(L-丙交酯)单晶(HEP-PLA(SC))和聚(D,L-丙交酯)(PDLLA)微粒用于组装亲水性和细胞势不可分能的三维组织工程支架,仅通过压缩成型组装/盐浸出技术。 PLLA与肝素接枝以促进其表面细胞偶联性,而添加PDLLA以加强支架。用四亚乙基二胺(13-原子间隔物)氨解PLLA(SC),以在表面上产生空间可接近的氨基,允许通过碳二亚胺化学的共价附着肝素。形态学和抗压强度研究表现出支架的完整性和紧凑性。甲苯胺蓝色测定确保肝素分布在整个支架上的一致性,这与肝素溶液中的支架浸入支架上违背了常规的接枝反应。通过成纤维细胞播种实验检查支架适用性。与原始支架相反,HEP-PLLA(SC)支架显示有用于细胞粘附,扩散,生长和迁移的亲水性和细胞系互相互相界面。因此,将预设接枝PLLA(SC)与PDLLA微粒组合可以提供具有表现出生物活性界面的耐用支架和接枝的生物致疣的可控空间分布。 (c)2019 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2019,136,47797。

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