A recent collaboration with our colleagues further advances the field of X-ray pair distribution function analysis applied to the analysis of amorphous solid dispersions. In this paper, we present the results of different polymer:flubendazole drug dispersions exposed to aging conditions. We discovered that if the polymer has ion-base interactions with the drug, the resulting dispersion is more stable. We also identified specific regions of the X-ray PDFs that could be used to reliably probe for these interactions.
