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The submicroparticles ofβ-sitosterol were produced by using an aerosol solvent extraction system (ASES)and characterized by scanning electronic microscope(SEM),X-ray diffraction(XRD),and Fourier transform infrared(FT-IR)analysis.The effects of operational parameters including pressure,temperature,solution concentration,and ratio of flow rate(CO2/solution,r)on particle size(PS),yield,and morphology were investigated. The results showed that microparticles ofβ-sitosterol(less than 1000 nm size and larger than 70%yield)could be obtained at 10-15 MPa,35-50°C,15 mg·ml -1 ,10/1(r);β-sitosterol particles were found to occur as three mopholo- gies:flakes,rods,and spheres by varying ratio of flow rate or solution concentration.In contrast,the crystallinity of β-sitosterol decreased,whereas its molecular structure remained almost unchanged after being ASES-treated. Therefore,ASES was an effective method to produce submicroparticles ofβ-sitosterol.
The submicroparticles of β-sitosterol were produced by using an aerosol solvent extraction system (ASES) and characterized by scanning electronic microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared parameters including pressure, temperature, solution concentration, and ratio of flow rate (CO2 / solution, r) on particle size (PS), yield, and morphology were investigated. The results showed that microparticles of β- sitosterol (less than 1000 nm size and larger than 70% yield could be obtained at 10-15 MPa, 35-50 ° C, 15 mg · ml -1, 10/1 (r); β-sitosterol particles were found to occur as three mopholo- gies: flakes , rods, and spheres by varying ratio of flow rate or solution concentration. In contrast, the crystallinity of β-sitosterol decreased, and its molecular structure remained almost unchanged after being ASES-treated. Thus, ASES was an effective method to produce submicroparticles of β -sitosterol.