Utilization and Evaluation of Rice Bran and Rice Bran Wax as a Tablet Lubricant

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Agricultural Science

Background:

• Tablet lubricants are crucial for direct compression manufacturing.
• Current lubricants like magnesium stearate can have drawbacks.
• Exploring natural, sustainable alternatives is of significant interest.

Purpose of the Study:

• To evaluate stabilized defatted rice bran (sDFRB) and rice bran wax (RBW) from KJ CMU107 rice as potential tablet lubricants.
• To assess their impact on tablet physical and mechanical properties during direct compression.
• To compare their efficacy against commercial lubricants magnesium stearate (MGS) and hydrogenated cottonseed oil (HVO).

Main Methods:

• Formulations containing spray-dried rice starch (SDRS) were prepared with sFFRB, sDFRB, or RBW as lubricants.
• Tableting was performed using direct compression.
• Evaluated parameters included ejection force, weight variation, hardness, friability, disintegration time, and powder flow.

Main Results:

• All tested rice-derived materials significantly reduced tablet ejection forces compared to a non-lubricated control.
• sDFRB (0.5-1.0% w/w) lowered ejection force by up to 80% with minimal impact on hardness.
• RBW (0.5% w/w) effectively reduced ejection force by 82% while maintaining tablet strength comparable to HVO.

Conclusions:

• Stabilized defatted rice bran (sDFRB) demonstrates effective lubricating properties at 0.5-1.0% w/w, with minor effects on tablet hardness.
• Rice bran wax (RBW) is a highly effective lubricant at 0.5% w/w, offering good tablet strength and reduced ejection force without compromising hardness.
• Both sDFRB and RBW show potential for development as commercial lubricants in direct compression tablet formulations.