Correlation of extrusion forces, raw materials and sphere characteristics

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Chemical Engineering

Background:

• Sphere characteristics are crucial for drug delivery systems.
• Understanding the relationship between processing parameters and product quality is essential for pharmaceutical manufacturing.
• Excipient properties, such as solubility, influence the formulation and production of dosage forms.

Purpose of the Study:

• To investigate the correlation between extrusion forces and the characteristics of spheres produced.
• To determine the optimal range of extrusion forces for sphere formation across different drug solubilities.
• To establish phase diagrams for ternary mixtures to predict sphere formation.

Main Methods:

• Utilized dicalcium phosphate dihydrate, alpha-lactose monohydrate, and anhydrous beta-lactose as model drugs representing insoluble, medium, and highly soluble substances.
• Constructed phase diagrams for ternary mixtures comprising microcrystalline cellulose, water, and a third excipient.
• Produced spheres using these mixtures and analyzed the extrusion forces required.

Main Results:

• A strong correlation was observed between extrusion forces and sphere characteristics.
• The optimal region for obtaining good spheres corresponded to extrusion forces ranging from 630 to 1260 N.
• This correlation held true for all tested drug solubilities: insoluble, medium, and highly soluble.

Conclusions:

• Extrusion force is a critical parameter that predicts sphere quality in pharmaceutical manufacturing.
• A defined range of extrusion forces (630-1260 N) is suitable for producing good quality spheres irrespective of drug solubility.
• Phase diagrams coupled with extrusion force analysis can guide the development of spherical dosage forms.