Impact of Critical Material Attributes (CMAs)-Particle Shape on Miniature Pharmaceutical Unit Operations

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Chemical Engineering

Background:

• The U.S. Food and Drug Administration (FDA) promotes Quality by Design (QbD) principles for drug development.
• Critical Material Attributes (CMAs), such as particle shape, significantly influence pharmaceutical manufacturing processes and final product quality.
• Needle-shaped drug crystals, exemplified by Ciprofloxacin HCl (CIPRO), often exhibit poor flowability, low bulk density, and high compressibility, leading to processing challenges and impacting product performance.

Purpose of the Study:

• To investigate the impact of needle-shaped Ciprofloxacin HCl (CIPRO) crystal morphology on pharmaceutical processing.
• To evaluate the effectiveness of different processing methods, including a custom-designed grinder, in mitigating issues associated with needle-shaped particles.
• To assess the quality attributes of tablets manufactured from processed CIPRO powder and compare them to commercial standards.

Main Methods:

• Crystallization of Ciprofloxacin HCl (CIPRO) resulted in needle-shaped particles, which were then processed using a mortar-pestle, a Krups grinder, and a custom-made grinder developed at MIT.
• The processed CIPRO powder was utilized to fabricate tablets using a miniature tablet manufacturing unit.
• Critical Quality Attributes (CQAs) of the tablets, as defined by the United States Pharmacopeia (USP), were assessed, including dissolution profiles.

Main Results:

• Processing with the custom MIT-designed grinder yielded powder properties comparable to commercial CIPRO.
• Tablets manufactured from the custom-ground CIPRO met USP criteria for critical quality attributes.
• Dissolution profiles of the tablets produced using the custom grinder were comparable to those of marketed CIPRO tablets.

Conclusions:

• Needle-shaped crystal morphology presents significant challenges in pharmaceutical operations, even at a miniature scale.
• Particle processing using the custom MIT-designed grinder effectively improved powder properties, addressing issues of lump formation and needle breakage.
• The study demonstrates that appropriate particle processing can achieve desired powder flow properties, leading to the successful manufacture of high-quality drug products meeting pharmacopeial standards.