Comparative evaluation of tablet lubricants: effect of application method on tablet hardness and ejectability after...

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Tablet manufacturing relies on lubricants to prevent sticking and ensure proper ejection.
• Understanding lubricant behavior is crucial for optimizing tablet properties like hardness and ejectability.

Purpose of the Study:

• To evaluate the impact of four common lubricants on the ejectability and hardness of compressed lactose tablets.
• To compare two lubricant application methods: incorporation versus mixing with granulation.

Main Methods:

• Four lubricants (stearic acid, magnesium stearate, calcium stearate, talc) were tested.
• Tablets were prepared using static compression of lactose granulation.
• Lubricants were applied via incorporation into or mixing with the granulation.

Main Results:

• Both lubricant application methods showed complex energy consumption and hardness curves with varying lubricant concentrations.
• The mixing method consistently resulted in improved tablet ejectability and hardness compared to the incorporation method.
• Lubricant concentration influenced tablet properties in a complex manner, particularly at lower levels.

Conclusions:

• The method of lubricant application significantly impacts tablet ejectability and hardness.
• Mixing lubricants with granulation is a more effective strategy than incorporating them for achieving desired tablet properties.
• Further research may explore the complex interactions between lubricants and granulation at different concentrations.