Application/Technical Notes


µDISS Profiler™

Nanoparticle formulations of active pharmaceutical ingredient (API) are often made in the form of a suspension with addition of surfactants to prevent nanoparticles from aggregating. The concentration of dissolved API in the nanosuspension is often unknown and determining the solubility of API when nanosuspension is added to the assay media is challenging. This technical note will describe the use of Zero Intercept Method (ZIM) implemented in Au PRO™ software to resolve these issues.


Because of its well characterized fluid hydrodynamics, the rotating disk method is a useful tool for mechanistic dissolution studies. The disk intrinsic dissolution rate (DIDR) measurements have been used to characterize solid drugs, including studies of dissolution-pH rate profiles in the presence of buffers, complexing agents, and various excipients. It is currently debated at the FDA whether the DIDR method can be used to determine solubility class membership in the Biopharmaceutics Classification System, with encouraging early indications.