Design of Nonsteroidal Anti-Inflammatory Drug-Based Ionic Liquids with Improved Water Solubility and Drug Delivery

We here report the synthesis of ionic liquids (ILs) composed of the cholinium cation and anions derived from nonsteroidal anti-inflammatory drugs (NSAIDs), namely ibuprofen, ketoprofen, and (S)-naproxen, and their incorporation into bacterial nanocellulose envisaging their use in topical drug delivery systems. The chemical structure of the synthesized ILs was confirmed by spectroscopic techniques, and thermal analysis confirming their categorization as ionic liquids with melting temperatures below 100 °C and resistance to autoclaving. The synthesized ILs display an aqueous solubility (at pH 7.4) ranging between 120 and 360 mM, which is up to 100 times higher than the solubility of the respective NSAID precursors, thus contributing to improved bioavailability. Their incorporation into bacterial cellulose originated transparent and homogeneous membranes. Thermogravimetric analysis (stable up to at least 225 °C) and mechanical assays (with minimum Young’s modulus of 937 MPa, maximum stress of 33 MPa and elon...

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