Rheological evaluations and in vitro studies of injectable bioactive glass-polycaprolactone-sodium alginate composites
| Autor: | Aliasghar Behnamghader, Saeed Hesaraki, Ebrahim Ghasemi, Shokoufeh Borhan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Calcium Phosphates
Thixotropy Materials science Alginates Simulated body fluid Polyesters Composite number Biomedical Engineering Biophysics Bioengineering Biocompatible Materials 02 engineering and technology 010402 general chemistry 01 natural sciences Viscoelasticity law.invention Biomaterials chemistry.chemical_compound Rheology Glucuronic Acid X-Ray Diffraction law Oscillometry Materials Testing Spectroscopy Fourier Transform Infrared Composite material Shear thinning Viscosity Hexuronic Acids technology industry and agriculture 021001 nanoscience & nanotechnology Elasticity Microspheres 0104 chemical sciences chemistry Bioactive glass Polycaprolactone Glass Stress Mechanical Powders 0210 nano-technology Shear Strength |
| Zdroj: | Journal of materials science. Materials in medicine. 27(9) |
| ISSN: | 1573-4838 |
| Popis: | Composite pastes composed of various amounts of melt-derived bioactive glass 52S4 (MG5) and polycaprolactone (PCL) microspheres in sodium alginate solution were prepared. Rheological properties in both rotatory and oscillatory modes were evaluated. Injectability was measured as injection force versus piston displacement. In vitro calcium phosphate precipitation was also studied in simulated body fluid (SBF) and tracked using scanning electron microscopy, X-ray diffraction and FTIR analyses. All composite pastes were thixotropic in nature and exhibited shear thinning behavior. The magnitude of thixotropy decreased by adding 10–30 wt% PCL, while further amounts of PCL increased it again. Moreover, the composites were viscoelastic materials in which the elastic modulus was higher than viscous term. The pastes which were just made of MG5 or PCL had poor injectability, whereas the composites containing both of these constituents exhibited reasonable injectability. All pastes revealed adequate structural stability in contact with SBF solution. In vitro calcium phosphate precipitation was well observed on the paste made of MG5 and somewhat on the pastes with 10–40 wt% PCL, however the precipitated layer was amorphous in nature. Overall, the produced composites may be appropriate as injectable biomaterials for non-invasive surgeries but more biological evaluations are essential. |
| Databáze: | OpenAIRE |
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