Shell Formulation in Soft Gelatin Capsules: Design and Characterization.

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Soft gelatin capsules (SGCs) are a widely used pharmaceutical dosage form, second only to tablets.
• The integrity and performance of SGCs depend heavily on the properties of their gelatin shell.
• Various factors, including shell formulation, manufacturing conditions, and fill-shell interactions, can influence SGC characteristics.

Purpose of the Study:

• To provide an updated overview of soft gelatin capsule shell formulation and design.
• To present the application of mechanical and thermal analysis techniques for characterizing gelatin shells.
• To evaluate the impact of different parameters on gelatin behavior during SGC production and storage.

Main Methods:

• Review of literature on soft gelatin capsule shell formulations.
• Discussion of mechanical analysis techniques (e.g., tensile testing) for gelatin shells.
• Explanation of thermal analysis techniques (e.g., differential scanning calorimetry) for gelatin characterization.

Main Results:

• Shell formulation (gelatin source, plasticizers, additives) critically impacts shell properties.
• Manufacturing and storage conditions (temperature, humidity, light) significantly affect SGC stability.
• Fill-shell interactions play a crucial role in the overall performance and shelf-life of SGCs.
• Mechanical and thermal analyses are effective tools for monitoring gelatin shell properties, detecting subtle changes before visual signs appear.

Conclusions:

• Optimizing shell formulation and controlling manufacturing/storage conditions are essential for SGC quality.
• Mechanical and thermal analysis provide valuable insights into gelatin shell behavior, aiding in process optimization and stability assessment.
• These techniques ensure the production of high-quality soft gelatin capsules with predictable shelf-life.