Monitoring ceramic hydroxyapatite media degradation using dynamic image analysis and uniaxial confined bulk compression
| Autor: | Larry J. Cummings, Mark A. Snyder, Nick Keener, Brian Williamson, Shawn Cao, Oliver Kaltenbrunner, Nancy Jiao, Esteban Freydell, Li Zhu |
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| Rok vydání: | 2011 |
| Předmět: |
Packed bed
Ceramics Chromatography Materials science General Medicine Hydrogen-Ion Concentration Phosphate Compression (physics) Applied Microbiology and Biotechnology Aspect ratio (image) Buffer (optical fiber) chemistry.chemical_compound Durapatite Chemical engineering chemistry visual_art visual_art.visual_art_medium Image Processing Computer-Assisted Molecular Medicine Degradation (geology) Particle Ceramic Stress Mechanical Particle Size |
| Zdroj: | Biotechnology journal. 7(10) |
| ISSN: | 1860-7314 |
| Popis: | Ceramic hydroxyapatite (CHT) is a multimodal chromatographic medium widely used in the pharmaceutical industry for the purification of biomolecules. CHT is a sintered form of hydroxyapatite crystals with moderate stability at acidic conditions. This moderate stability may lead to underperformance of CHT packed bed lifetime, especially under acidic conditions, which should be monitored by diagnostic tools to design optimal buffer systems for the step. This study presents the application of dynamic image analysis (DIA) and uniaxial confined bulk compression (UCBC) to monitor CHT particle degradation as a function of buffer composition. DIA was used to evaluate changes in solidity and morphology, while UCBC was used to evaluate changes in resistance to uniaxial compression. All properties were studied as a function of bed position and operational parameters. Results show that when CHT is exposed to acidic pH, adding phosphate and/or calcium at concentrations of 1 mM minimizes changes in particle solidity and mechanical strength. Changes in CHT morphological properties (i.e., convexity, aspect ratio) are also affected by the presence of calcium and/or phosphate in the inlet buffers. Furthermore, calcium and phosphate have a positive effect on the mechanical behavior of CHT, which is related to changes in the CHT particle solidity. |
| Databáze: | OpenAIRE |
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