Compressional characterization of two dextrose-based directly compressible excipients using an instrumented tablet...

The main objective of this work was to evaluate the compaction behavior and record the work and the force involved in the compaction of blends and granules of two dextrose-based directly compressed excipients using a single-punch instrumented tablet press. The second objective was to identify the predominant form of deformation for the two different directly compressible excipients. Anhydrous theophylline (10% w/w) was used as a drug model, Emdex and/or Maltrin M 510 (89.5% w/w) were used as diluent, and magnesium stearate (0.5% w/w) was used as lubricant. All formulations were compressed at four different compressional forces and at a target tablet weight of 450 mg +/- 5%. Results show that compacts prepared from Emdex using the direct compression method produced the lowest elastic work and die wall friction, and the best degree of lubrication. Wet granulation for Maltrin M 510 decreased elastic work, frictional work, and ejection force, and enhanced both net work and degree of lubrication. In general, wet granulation for both Emdex and Maltrin M 510 decreased the crushing strength of the tablets and enhanced the degree of lubrication, compared to direct compression formulations. All formulations showed similar shape pattern for plastic deformation, suggesting that the predominant mechanism of deformation is plastic deformation type a Heckel plots.