Particle formation by supercritical fluid extraction and expansion process.

Area of Science:

• Green chemistry and separation science
• Nanotechnology and materials science
• Natural product chemistry

Background:

• Supercritical fluid extraction (SFE) is a green technology for natural product extraction.
• Rapid expansion of supercritical solution (RESS) is used for particle formation.
• Chinese herbal medicine and natural active components are key application areas.

Purpose of the Study:

• To present a novel Supercritical Fluid Extraction and Expansion (SFEE) patented technology.
• To demonstrate the feasibility of direct nanoparticle formation from complex matrices.
• To validate the purification capabilities of the SFEE process.

Main Methods:

• Development and control of a novel SFEE instrument using LABVIEW.
• Optimization of SFEE process parameters (pressure, temperature) for particle size control.
• Verification of purification efficacy using stearic acid and HPLC-ELSD detection.

Main Results:

• The SFEE instrument was successfully built and operated.
• Adjustable particle sizes were achieved by controlling pre-expansion pressure and temperature.
• Stearic acid purity was increased by 19% through the SFEE purification process.

Conclusions:

• The SFEE patented technology effectively integrates SFE and RESS for nanoparticle formation.
• SFEE allows direct nanoparticle generation from matrices like Chinese herbal medicine.
• The developed SFEE system demonstrates significant purification capabilities for compounds such as stearic acid.