Lipid/Clay-Based Solid Dispersion Formulation for Improving the Oral Bioavailability of Curcumin

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Biopharmaceutics

Background:

• Curcumin, a natural compound, suffers from poor water solubility and low oral bioavailability.
• Enhancing curcumin's dissolution and absorption is crucial for its therapeutic applications.

Purpose of the Study:

• To develop a lipid/clay-based solid dispersion (LSD) formulation of curcumin.
• To improve the dissolution rate and oral bioavailability of poorly soluble curcumin.

Main Methods:

• Formulation of curcumin LSD using krill oil (lipid) and aminoclay (stabilizer) via antisolvent precipitation and freeze-drying.
• Characterization using X-ray powder diffraction, differential scanning calorimetry, and scanning electron microscopy.
• In vitro dissolution studies and in vivo oral absorption studies in rats.

Main Results:

• The optimal LSD formulation (curcumin:krill oil:aminoclay 1:5:5) transformed crystalline curcumin into an amorphous state.
• The LSD formulation achieved >90% dissolution within 1 hour in acidic to neutral pH, compared to <10% for pure curcumin.
• In rats, the LSD formulation showed 13-fold higher Cmax and 23-fold higher AUC for curcumin compared to the pure drug.

Conclusions:

• The developed krill oil-based LSD formulation effectively enhances curcumin's dissolution.
• This novel formulation significantly improves the oral bioavailability of curcumin.
• LSD technology offers a promising approach for delivering poorly soluble drugs like curcumin.