Some physicochemical properties of mefenamic acid

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Mefenamic acid exhibits poor solubility and hydrophobicity, complicating pharmaceutical manufacturing processes like granulation and tableting.
• Pharmacopoeial standards often lack detailed physicochemical characterization, hindering process optimization.

Purpose of the Study:

• To comprehensively characterize physicochemical properties of mefenamic acid from different manufacturers.
• To evaluate the impact of these properties on pharmaceutical processing, specifically granulation and compression.

Main Methods:

• Particle size analysis
• Surface area measurements
• X-ray diffraction
• Differential scanning calorimetry (DSC)
• Wettability tests
• Crystal habit analysis
• Compression behavior evaluation

Main Results:

• Significant variations in particle size, surface area, and wettability were observed between mefenamic acid batches from two manufacturers.
• The Il Yang type mefenamic acid, with larger particle size and better wettability, demonstrated easier handling during granulation.
• Despite differences in particle characteristics, both mefenamic acid types exhibited similar compression behavior during tableting.

Conclusions:

• Physicochemical properties like particle size and wettability significantly influence the processability of mefenamic acid during granulation.
• While particle characteristics varied, mefenamic acid's compression behavior remained consistent, suggesting robustness in tableting.
• Detailed physicochemical characterization is crucial for optimizing pharmaceutical manufacturing processes for poorly soluble drugs like mefenamic acid.