The Effect of Recompression on the Swelling Kinetics of Wet Massed Tablets, Containing ‘Super’ Disintegrants

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Abstract
The effect of recompression on the swelling force kinetics of tablets employing a wet massed Avicel matrix and those containing extra-granular super disintegrants has been investigated. Explotab, unlike the Ac-Di-Sol and Polyplasdone XL systems, was found to give a high initial compact swelling force at low tablet porosities, but the rework process reduced the maximal swelling forces for all systems. However, the measured maximal swelling forces did not correlate with tablet disintegration time. The rate of fluid penetration into the compacts was found to be controlled by tablet porosity but the penetration rates for all disintegrant systems were essentially identical. However the penetration rates for reworked compacts were significantly lower than those for tablets produced by first compression possibly due to the effects of increased lubricant distribution and relubrication causing poorer wettability. Tablet disintegration times were found to correlate with a fluid penetration kinetic function involving lag time and time for 50% tablet swelling. Also, the retention of disintegration efficiency following rework correlated with the retention of the rate of fluid penetration. It is concluded that lubricants can play an important role in the efficiency of compact disintegration following tablet rework.

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