Micronization of Ibuprofen Particles Using Supercritical Fluid Technology

Area of Science:

• Pharmaceutical Sciences
• Chemical Engineering
• Materials Science

Background:

• Many drugs exhibit poor solubility in the human circulatory system, limiting their therapeutic efficacy.
• Conventional methods for particle size reduction often fail to achieve the narrow particle size distribution required for pharmaceuticals.
• Supercritical fluids, particularly supercritical CO₂, present a promising alternative for producing submicron and nanoparticles with enhanced properties.

Purpose of the Study:

• To investigate the micronization of ibuprofen particles using supercritical fluid technology.
• To characterize the physical and performance properties of the resulting ibuprofen nanoparticles.
• To evaluate the potential of supercritical fluid processing for improving drug solubility and bioavailability.

Main Methods:

• Ibuprofen micronization was performed using a commercial Spe-ed SFE-4 device in the rapid expansion of supercritical solution mode.
• Processing conditions involved temperatures of 308.15 K and 313.15 K, and pressures of 200, 250, and 300 bar.
• Characterization techniques included X-ray diffraction, infrared spectroscopy, particle size distribution analysis, scanning electron microscopy, and dissolution/permeability testing.

Main Results:

• Mean particle size of ibuprofen was significantly reduced from an initial 180 μm to a range of 2.8-7.3 μm after supercritical fluid processing.
• X-ray diffraction and infrared spectroscopy confirmed the crystalline structure and chemical integrity of the micronized ibuprofen particles.
• Dissolution tests demonstrated enhanced solubility, and permeability tests indicated improved drug absorption characteristics.

Conclusions:

• Supercritical fluid technology, specifically rapid expansion of supercritical solutions, is an effective method for producing ibuprofen nanoparticles with a narrow size distribution.
• The micronization process using supercritical CO₂ leads to improved drug solubility and permeability, offering a solvent-free and efficient approach for pharmaceutical formulation.
• This technique holds significant potential for enhancing the bioavailability and therapeutic effectiveness of poorly soluble drugs.