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Hydroxyl Groups Induce Bioactivity in Silica/Chitosan Aerogels Designed for Bone Tissue Engineering. In Vitro Model for the Assessment of Osteoblasts Behavior

机译:羟基诱导用于骨组织工程的二氧化硅/壳聚糖气凝胶中的生物活性。对成骨细胞行为评估的体外模型

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摘要

Silica (SiO2)/chitosan (CS) composite aerogels are bioactive when they are submerged in simulated body fluid (SBF), causing the formation of bone-like hydroxyapatite (HAp) layer. Silica-based hybrid aerogels improve the elastic behavior, and the combined CS modifies the network entanglement as a crosslinking biopolymer. Tetraethoxysilane (TEOS)/CS is used as network precursors by employing a sol-gel method assisted with high power ultrasound (600 W). Upon gelation and aging, gels are dried in supercritical CO2 to obtain monoliths. Thermograms provide information about the condensation of the remaining hydroxyl groups (400–700 °C). This step permits the evaluation of the hydroxyl group’s content of 2 to 5 OH nm−2. The formed Si-OH groups act as the inductor of apatite crystal nucleation in SBF. The N2 physisorption isotherms show a hysteresis loop of type H3, characteristic to good interconnected porosity, which facilitates both the bioactivity and the adhesion of osteoblasts cells. After two weeks of immersion in SBF, a layer of HAp microcrystals develops on the surface with a stoichiometric Ca/P molar ratio of 1.67 with spherulite morphology and uniform sizes of 6 μm. This fact asserts the bioactive behavior of these hybrid aerogels. Osteoblasts are cultured on the selected samples and immunolabeled for cytoskeletal and focal adhesion expression related to scaffold nanostructure and composition. The initial osteoconductive response observes points to a great potential of tissue engineering for the designed composite aerogels.
机译:当它们浸没在模拟体液(SBF)中时,二氧化硅(SiO 2)/壳聚糖(CS)复合气凝胶是生物活性的,导致骨样羟基磷灰石(HAP)层的形成。基于二氧化硅的混合气凝胶改善了弹性行为,并且组合的CS将网络缠绕作为交联生物聚合物改变。通过采用辅助高功率超声(600W)的溶胶 - 凝胶法使用四乙氧基硅烷(TEOS)/ CS作为网络前体。在凝胶化和衰老时,在超临界CO 2中干燥凝胶以获得整料。热图提供有关剩余羟基(400-700℃)的缩合的信息。该步骤允许评价羟基的含量为2至5hnm-2。形成的Si-OH基团充当SBF中磷灰石晶体成核的电感。 N2理由等温线显示H3型滞后回路,特征到良好的互连孔隙率,这有利于骨细胞细胞的生物活性和粘附性。在SBF浸入两周后,一层HAP微晶在表面上发育,化学计量CA / P摩尔比为1.67,球形形态和均匀尺寸为6μm。这一事实断言了这些混合气凝胶的生物活性行为。在选定的样品上培养成骨细胞,免疫标记用于与支架纳米结构和组合物有关的细胞骨骼和局部粘附表达。初始骨导电响应观察到设计复合气凝胶的组织工程的巨大潜力。

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