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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.
