Correlation between loose density and compactibility of granules prepared by various granulation methods

Area of Science:

• Pharmaceutical Technology
• Materials Science

Background:

• Granulation is a key step in tablet formulation.
• Polyethylene glycol 6000 (PEG 6000) is a common binder in pharmaceutical granulation.

Purpose of the Study:

• To prepare lactose granules using various wet and melt granulation techniques with PEG 6000.
• To evaluate the impact of these granulation methods on granule compressibility and compactibility for tabletting.

Main Methods:

• Employed seven granulation methods: four wet (massing, high-speed mixer, fluidized bed, tumbling fluidized bed) and three melt (high-speed mixer, fluidized bed, tumbling fluidized bed).
• Assessed granule properties including loose density, angle of repose, size distribution, and mean diameter.
• Evaluated tablet characteristics such as tensile strength and porosity.

Main Results:

• Granulation methods significantly influenced granule compactibility.
• Heckel plot analysis indicated no difference in compressibility across methods, suggesting compactibility variations were not solely due to compressibility.
• Granule loose density showed a correlation with tablet strength, independent of the granulation method used.

Conclusions:

• Granulation method selection is critical for optimizing lactose granule properties for tabletting.
• Loose granule density is a key parameter influencing final tablet strength.
• Further research may elucidate the precise mechanisms linking granulation methods, granule properties, and tablet performance.