Questions
1-2 descriptive questions in B.Pharm semester exams
Difficulty
Medium
Importance
Essential for Pharmaceutical Technology modules
Overview
Capsules and pellets represent essential solid oral dosage forms designed for controlled or targeted drug release. This topic is fundamental for understanding pharmaceutical technology, focusing on the composition, manufacturing mechanisms, and material selection criteria required for patient compliance and drug stability.
Hard Gelatin Capsules
Hard gelatin capsules consist of two cylindrical sections, the body and the cap, which are filled with dry powder, granules, or pellets. They are produced by the dipping process where metal pins are immersed in a gelatin solution.
- Composition: Gelatin, water, plasticizers (glycerin/sorbitol), and opacifiers (TiO2).
- Moisture content: 13-16% is critical to prevent brittleness.
- Bloom strength: 150-280g range indicates gelatin quality.
- Size range: 000 (largest) to 5 (smallest).
- Sealing techniques: Heat welding or banding to prevent tampering.
Soft Gelatin Capsules
Soft gelatin capsules are single-unit, hermetically sealed containers where a liquid or semi-solid fill is encapsulated in a one-piece flexible shell. These are manufactured using the rotary die process or plate process.
- Higher plasticizer content compared to hard shells.
- Ratio of plasticizer to gelatin typically ranges from 0.2:1 to 1.0:1.
- Ideal for drugs with poor solubility or liquid-state actives.
- Rotary die process allows for high-speed automated production.
- Cannot be used for aqueous materials (water migrates into the shell).
Pelletization Techniques
Pelletization is the process of converting fine powders or granules into small, free-flowing, spherical agglomerates known as pellets. This technique improves drug stability and enables the layering of multiple active ingredients in a single dosage form.
- Extrusion-spheronization: The most common industrial method for uniform pellets.
- Drug layering: Coating active drugs onto inert non-pareil sugar seeds.
- Solution/Suspension layering: Sprayed onto starter cores using fluidized bed systems.
- High-shear granulation: Creating pellets through mechanical agitation.
- Advantages: Reduced dose dumping, improved flow, and versatile release profiles.
Exam Tip
Always differentiate between 'drug layering' and 'extrusion-spheronization' when asked about pellet manufacturing, as these are the two primary methodologies used in the industry.
Common Mistakes
- Confusing the moisture requirements of hard vs soft gelatin capsules during storage.
- Neglecting to mention the importance of plasticizer-to-gelatin ratios for shell flexibility.
- Incorrectly identifying the production process for soft capsules as the dipping method.
More Revision Notes
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