Solubilization of Biologically Active Heterocyclic Compounds by Biocompatible Microemulsions

Microemulsions based on biocompatible components with high water content are applied to increase the solubility of medicinal drugs of the heterocyclic series indomethacin and 1-[5-(4-chlorophenyl)-3-phenylpyrrole-2-yl]benzimidazole-2(3H)-one (PBI). The solubilizing capacity is characterized quantitatively via spectrophotometry. It is shown that four-component microemulsion water/oleic acid/Tween 80/ethanol increases the limits of indomethacin solubility by more than two orders of magnitude, and that of PBI by more than three orders relative to water.