Effects of Processing on a Sustained Release Formulation Prepared by Twin-Screw Dry Granulation

Area of Science:

• Pharmaceutical Technology
• Materials Science
• Chemical Engineering

Background:

• Dry granulation is crucial for improving the flow of moisture-sensitive pharmaceutical materials.
• Existing dry granulation methods have limitations, necessitating the development of novel techniques.
• Sustained-release formulations require precise control over granule properties for effective drug delivery.

Purpose of the Study:

• To investigate the application of twin-screw dry granulation (TSDG) technology for producing sustained-release granules.
• To optimize TSDG processing parameters for desired product characteristics.
• To evaluate TSDG as a viable alternative to conventional dry granulation methods.

Main Methods:

• Theophylline was used as a model drug, with Klucel™ EF, Ethocel™, and magnesium stearate as excipients.
• A Resolution V Irregular Fraction Design was employed to study the impact of screw speed, feeding rate, barrel temperature, and screw configuration.
• Product properties including flow, particle size distribution, and dissolution time were analyzed.

Main Results:

• A reliable predictive model was developed by integrating experimental data.
• Processing parameters were automatically optimized to achieve target product specifications.
• TSDG successfully produced sustained-release granules suitable for tablet compression.

Conclusions:

• Twin-screw dry granulation (TSDG) is a demonstrated alternative for preparing dry granules.
• The continuous processing, operational simplicity, and ease of optimization make TSDG a competitive granulation technique.
• This novel approach addresses limitations of existing methods for moisture-sensitive materials.