The influence of porosity on tablet subdivision

A tablet microstructure, especially the porosity, is a crucial parameter that influences the mechanical properties. Herein, tablet subdivisions were studied as a function of tablet porosity. The tablets were manufactured in the presence of different diluents, namely microcrystalline cellulose, Ludipress®, or lactose monohydrate. Furthermore, the addition of Camphor was investigated, which was thereafter sublimated with a view of obtaining tablets having varying degrees of porosity. Microstructural assays were correlated to the subdivision performance. The increase in porosity reduced the hardness and increased the tablet friability, adversely impacting the subdivision.

Highlights

• Tablets of increasing porosity were achieved in the presence of a sublimable agent.

• A tablet porosity >90% led to inadequate subdivision outcomes.

• Irregular pore size distribution resulted in subdivision failure.

• Tablets having a subdivision purpose should have controlled porosity.

For all the excipients, an increase in relative porosity >90% represented the threshold level from which an inadequate subdivision occurred. The increase in tablet porosity led to a reduction in mechanical resistance, which, combined with a heterogeneous and discontinuous distribution of pores within the matrix, resulted in poor subdivision results. Controlling tablet porosity is an important consideration when designing tablets having a subdivision purpose. Continue on influence of porosity on tablet subdivision

Keywords:  Tablet subdivision, Porosity, Mass variation, Mass lossFriability, Hardness