Solid state evaluation of some thalidomide raw materials

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Thalidomide exhibits polymorphism, posing challenges due to poor solubility and tablet processing difficulties.
• Existing pharmacopoeial standards often lack detailed solid-state characterization requirements for drugs.

Purpose of the Study:

• To characterize different commercial thalidomide samples.
• To assess the homogeneity of thalidomide raw materials available in the market.
• To evaluate the impact of solid-state properties on drug performance.

Main Methods:

• Infrared spectroscopy
• Particle size analysis
• Scanning electron microscopy
• X-ray diffraction
• Rietveld analysis for polymorphic quantification
• Intrinsic dissolution rate evaluation

Main Results:

• Commercial thalidomide samples displayed significant heterogeneity.
• Variations were observed in crystalline constitution, crystal habit, and polymorphic composition.
• Intrinsic dissolution rates differed considerably among the analyzed samples.

Conclusions:

• Marketed thalidomide raw materials lack homogeneity, impacting drug quality and consistency.
• Solid-state characterization is crucial for ensuring pharmaceutical product quality.
• Further research is needed to standardize thalidomide production and quality control.