Vertical Hot-Melt Extrusion: The Next Challenge in Innovation

Area of Science:

• Pharmaceutical Science
• Materials Science

Background:

• Hot-melt extrusion (HME) is crucial for improving the solubility of poorly soluble Active Pharmaceutical Ingredients (APIs).
• Vertical HME, though less explored than horizontal HME, offers advantages in space-saving, feeding, temperature management, and continuous manufacturing integration.
• This study explores vertical HME for optimizing drug-polymer interactions and creating stable amorphous dispersions with controlled release.

Purpose of the Study:

• Investigate vertical hot-melt extrusion (HME) for pharmaceutical formulation.
• Optimize drug-polymer interactions for stable amorphous dispersions.
• Develop controlled drug release profiles using vertical HME.

Main Methods:

• Utilized a vertical hot-melt extruder (Rondol Industrie).
• Employed acetylsalicylic acid (ASA) as a model API with Soluplus® and Kollidon® 12 PF polymers.
• Characterized extrudates using powder X-ray diffraction (PXRD) and small-angle X-ray scattering (SAXS).
• Assessed in vitro drug release via USP Apparatus II dissolution testing.

Main Results:

• Vertical HME produced homogeneous amorphous solid dispersions.
• PXRD confirmed the absence of crystallinity; SAXS indicated drug loading and thermal input influenced polymer nanostructure.
• In vitro dissolution tests showed significantly enhanced ASA release rates compared to crystalline form, with high reproducibility.

Conclusions:

• Vertical HME is a viable, compact, and modular technology for developing stable amorphous dispersions.
• This method facilitates controlled drug release and pharmaceutical innovation.
• Vertical HME shows potential for cost-effective continuous manufacturing and industrial scale-up.