Drug Nano-Particles Formation by Supercritical Rapid Expansion Method; Operational Condition Effects Investigation

Document Type: Research Article


1 Department of Chemical Engineering, Faculty of Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, I.R. IRAN

2 Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

3 Department of Chemical Engineering, Faculty of Engineering, Science & Research Branch, Islamic Azad University, Tehran, I.R. IRAN

4 Department of Chemical Engineering, Faculty of Engineering, Tehran South Branch, Islamic Azad University, Tehran, I.R. IRAN

5 Faculty of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRAN


Dissolution pressure and nozzle temperature effects on particle size and distribution were investigated for RESS (Rapid Expansion of Supercritical Solution) process. Supercritical CO2 was used as solvent and Ibuprofen was applied as the model component in all runs. The resulting Ibuprofen nano-particles (about 50 nm in optimized runs) were analyzed by SEM and laser diffraction particle size analyzer systems. Results show that in low supercritical pressure ranges, depending on the solvent and solid component properties (Lower than 105 bar for Ibuprofen-CO2 system), nozzle temperature should be as low as possible (80-90˚C for Ibuprofen-CO2 system). In the other hand in high supercritical pressure ranges (above 105 bar), high nozzle temperatures work better. The border line of these two areas depends on the solvent phase behavior. Rapid Expansion of Supercritical Solution into a liquid solvent (RESOLV) was also studied with and without the presence of surfactant and compared with RESS process by measuring of formed particles size, size distribution and dissolution rate. Results show that the RESS process generally creates better conditions for achieving fine and uniform organic powders (with mean particles size of 40-180 nm), in contrast to the RESOLV method (minimum particles size of 80-400 nm).  


Main Subjects

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