摘要
Efficient downstream processing of active pharmaceutical ingredients (APIs) can depend strongly on their particulate properties, such as size and shape distributions. Especially in drug products with high API content, needle-like crystal habit of an API may show compromised flowability and tabletability, creating significant processability difficulties on a production scale. However, such a habit can be adapted to the needs of downstream processing. To this end, we modified the needle-like crystal habit of the model API 5-aminosalicylic acid (5-ASA): This study reports procesability assessment of six representative crystal habits of 5-ASA (needles, plates, rectangular bars, rhombphedrals, elongated hexagons, and spheroids) in the context of direct compression using ring shear-tester, flow rate analyzer, and instrumented tablet press. As expected, needles were very cohesive, had low flow rate (1.0 +/- 0:08 mg/s), and low bulk density (0.141 +/- 0.01 g/mL)but showed better tabletability,whereas the opposite We observed with more isotropic crystal habits. For instance, spheroids, elongated hexagons, and rhombohedrals were easy/free-flowing and had high bulk densities (>= 0.5 g/mL), but final tablets had lower tensile strength than that of needles. Of the six crystal habits, the plates showed a good compromise considering both flowability and tabletability.
- 出版日期2017-4