Physical properties and compact analysis of commonly used direct compression binders

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Direct compression is a widely used pharmaceutical manufacturing method.
• Excipients are crucial for tablet formulation, influencing drug delivery and stability.
• Understanding excipient properties is vital for optimizing direct compression processes.

Purpose of the Study:

• To investigate the physico-chemical properties and binding functionality of common direct compression excipients.
• To analyze the compressibility of microcrystalline cellulose (MCC), starch, lactose, dicalcium phosphate (DCP), and sugar using established equations.
• To elucidate the binding mechanisms of these excipients under compression.

Main Methods:

• Physico-chemical characterization including moisture content, density, and particle size analysis.
• Compressibility analysis using Heckel, Kawakita, and Cooper-Eaton equations.
• Evaluation of flowability, compressibility, and compact hardness for each excipient class.

Main Results:

• Starch had the highest moisture content; DCP exhibited the highest density.
• Microcrystalline cellulose (MCC) demonstrated moderate flowability, excellent compressibility, and high compact hardness.
• Dicalcium phosphate (DCP) showed excellent flowability but poor compressibility and hardness.
• Starch, lactose, and sugar generally displayed moderate flowability, compressibility, and hardness.

Conclusions:

• Microcrystalline cellulose (MCC) excels as a binder due to plastic deformation.
• Lactose and dicalcium phosphate (DCP) primarily bind through fragmentation.
• Starch and sugar utilize both plastic deformation and fragmentation for binding.
• Excipient selection significantly impacts direct compression tablet properties.