Comparison of induction methods for supersaturation: pH shift versus solvent shift

This study investigates the impact of the induction method of supersaturation for nine basic drugs, A0619, A2853, albendazole, cinnarizine, dipyridamole, intraconazole, JNJ39393406, ketoconazole, and posaconazole, on four parameters: highest apparent degree of supersaturation, induction time, precipitation rate and solid form of the precipitate, using a novel standardized small-scale supersaturation and precipitation method. For eight of the nine drugs, the same highest apparent degree of supersaturation was obtained with both induction methods. For the induction time, precipitation rate and the solid form of the precipitate, no systematic differences between the induction methods were detected, however individual drugs did show differences. The study shows that, if a drug is sufficiently soluble at low pH, the solvent shift and pH shift induction methods of supersaturation yield comparable results.Graphical abstract
Source: International Journal of Pharmaceutics - Category: Drugs & Pharmacology Source Type: research