Surfactants are often used to improve the solubility of a compound for dissolution studies in aqueous media. Having observed non-linear solubility enhancement with increasing surfactant concentration, this study investigated the effect of a poorly soluble, zwitterionic, moderately lipophilic drug, Compound A, on the critical micelle concentration (CMC)of sodium lauryl sulfate (SLS) in phosphate buffer. A force tensiometer was used to measure the surface tension of the solutions over a range of surfactant concentrations. The presence of Compound A demonstrated a decrease in the CMC, suggesting that the solution favours micellisation at lower surfactant concentrations in the presence of the drug. Future studies will use a fully saturated solution of Compound A to explore this observation further. Additional experiments will also investigate micelle formation of SLS with other compounds.
critical micelle concentration, dissolution, solubility, surfactant
How to Cite
Greensides, P. & McAllister, M. & Sarcevica, I. & Tomaszewska, I., (2022) “Exploring drug-surfactant interactions and their impact on the intrinsic surface properties of aqueous dissolution media”, British Journal of Pharmacy 7(2). doi: https://doi.org/10.5920/bjpharm.1081