In order to investigate the potential shelf-life of the formulations (A-pEtEtOx-A and A-pPrMeOx-A series), the freshly prepared CUR, PTX and IBU aqueous formulations were stored at ambient conditions containing the initial precipitate after thin-film hydration (if any). The samples were collected at day 0, 1, 8, 20, 30 and 60 with centrifugation before each collection to sediment precipitate (if any). The soluble drug remaining in the supernatant was then quantified.