Streamlining of the Powder Mixing Process based on a Segregation Test

Area of Science:

• Pharmaceutical Technology
• Materials Science

Background:

• Maintaining content uniformity is critical in direct tablet compression, especially for low drug loading formulations.
• Current industry practices often involve complex, multi-step mixing processes to achieve uniformity.
• Drug particle properties significantly influence blend homogeneity and segregation behavior.

Purpose of the Study:

• To introduce and validate a simple segregation test for evaluating mixing process performance and blend segregation.
• To assess the feasibility of using this test to ensure content uniformity in tablets.
• To explore the potential for process simplification and cost reduction in tablet manufacturing.

Main Methods:

• A model drug with variable particle size and shape was used.
• Two formulation blends (simple and complex preparation) were created for each drug batch.
• Segregation tests were performed, and segregation coefficients were calculated.
• Process Analytical Technology (PAT) was considered for real-time monitoring and adjustment.

Main Results:

• Inter-particulate interactions, influenced by drug particle morphology and size, led to varied segregation behavior.
• The simple segregation test effectively differentiated segregation tendencies and homogeneity robustness.
• The test identified potential for simplifying the mixing process for a specific drug batch (Batch A).

Conclusions:

• A simple segregation test is a valuable tool for assessing drug batch suitability for specific formulations.
• This method can help achieve satisfactory content uniformity while simplifying manufacturing processes.
• The findings support process intensification and cost reduction in tablet production.