Evaluation of moisture sorption by tablet cores containing superdisintegrants during the aqueous film coating process

A physical-chemical analysis of the extent of sorption of water by tablets containing superdisintegrants was carried out following the aqueous film coating of formulated tablets. Characterization of the uncoated and coated tablet properties was conducted using thermogravimetric analysis, differential scanning calorimetry, mercury intrusion porosimetry, and measurement of the tablet tensile strength. Tablet residual moisture content, pore system characteristics, tensile strength, and glass transition temperature of the amorphous polymer components of the tablet matrix were significantly affected after the coating operation. These findings were attributed to the penetration of water from the aqueous film coating solution into the tablet matrix.