title: Influence of supercritical CO(2) pressurization on the phase behavior of mixed cholesteryl esters.
abstract: Evidences indicating the presence of phase transformations in the mixed cholesteryl benzoate (CBE) and cholesteryl butyrate (CBU) under the supercritical CO(2) pressurization, by means of differential scanning calorimetry (DSC) and X-ray diffraction (XRD), are presented in this work. These include (1) the DSC heating curve of pure CBU; (2) the DSC heating curves of CBU/CBE mixtures; (3) the XRD spectra of pure CBU; (4) the XRD spectra of CBU/CBE mixtures; (5) CBU and CBE are miscible in either solid phase or liquid phase over the whole composition range. As a result of the presence of these phase transformations induced by pressurization, it could be deduced that a solid solution of the CBU/CBE mixture might have formed at the interfaces under supercritical conditions, subsequently influencing their dissolving behaviors in supercritical CO(2).
authors.affiliation: Tianjin Key Laboratory of Refrigeration Technology, Department of Packaging Engineering, Tianjin University of Commerce, Tianjin 300134, China. huang900@yahoo.com
authors.forename: Zhen
authors.initials: Z
authors.lastname: Huang
authors.forename: Mei
authors.initials: M
authors.lastname: Feng
authors.forename: Junfeng
authors.initials: J
authors.lastname: Su
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Guo
authors.forename: Tie-Yan
authors.initials: TY
authors.lastname: Liu
authors.forename: Yee C
authors.initials: YC
authors.lastname: Chiew
mesh_terms: D002152:Calorimetry, Differential Scanning; D002245:Carbon Dioxide; D002788:Cholesterol Esters / Q000737:chemistry*; D025924:Chromatography, Supercritical Fluid; D003460:Crystallization; D044367:Phase Transition; D014961:X-Ray Diffraction
chemical_list: D002788:Cholesterol Esters; D002245:Carbon Dioxide; C092211:cholesteryl butanoate; C029808:cholesteryl benzoate