Abstract The purpose of this study was to investigate the hydrolyzation of aspirin during the
process of dissolution testing for aspirin delayed-release tablets. Hydrolysis product of salicylic acid
can result in adverse effects and affect the determination of dissolution rate assaying. In this study,
the technique of differential spectra was employed, which made it possible to monitor the
dissolution testing in situ. The results showed that the hydrolyzation of aspirin made the percentage
of salicylic acid exceed the limit of free salicylic acid (4.0), and the hydrolyzation may affect the
quality detection of aspirin delayed-release tablets