Disintegrants facilitate tablet disintegration through various mechanisms:
Mechanisms of Disintegrants:
1. Water Absorption: Disintegrants absorb water, swelling and breaking apart, causing tablet disintegration.
2. Swelling Pressure: Swollen disintegrants create pressure, forcing tablet fragments apart.
3. Particle-Particle Repulsion: Disintegrant particles repel each other, breaking tablet structure.
4. Surface Tension Reduction: Disintegrants reduce water surface tension, facilitating penetration and disintegration.
5. Enzymatic Action: Some disintegrants (e.g., starch) are broken down by enzymes, enhancing disintegration.
Types of Disintegrant Mechanisms:
1. Physical Disintegration: Disintegrants absorb water, swell, and break apart (e.g., starch, cellulose).
2. Chemical Disintegration: Disintegrants react with water, releasing gases, and breaking tablet structure (e.g., effervescent tablets).
3. Enzymatic Disintegration: Disintegrants are broken down by enzymes, enhancing disintegration (e.g., starch).
Factors Influencing Disintegrant Mechanism:
1. Disintegrant Type: Chemical structure and properties.
2. Concentration: Amount of disintegrant used.
3. Particle Size: Smaller particles increase disintegration rate.
4. Tablet Formulation: API properties, excipients, and manufacturing process.
5. Environmental Conditions: Temperature, humidity, and pH.
Examples of Disintegrants and Their Mechanisms:
1. Starch (physical disintegration)
2. Cellulose (physical disintegration)
3. Crospovidone (swelling pressure)
4. Sodium starch glycolate (swelling pressure)
5. Polacrilin potassium (particle-particle repulsion)
Understanding disintegrant mechanisms helps optimize tablet formulations for improved performance.
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