1
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Hydrogenation of polyethylene terephthalate to environmentally friendly polyester over Vulcan XC-72 carbon supported Rh-Pt bimetallic catalyst. Catal Today 2022. [DOI: 10.1016/j.cattod.2020.09.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Sierra-Pallares J, del Valle JG, Bueno CM, Castro F, Lamanna G. High-pressure carbon dioxide–organic solvent mixing layers: Global equilibrium models and the transition to single phase mixing. J Supercrit Fluids 2021. [DOI: 10.1016/j.supflu.2020.105024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Lende AB, Bhattacharjee S, Tan CS. Production of Environmentally Friendly Polyester by Hydrogenation of Poly(butylene terephthalate) over Rh–Pt Catalysts Supported on Carbon Black and Recovery by a Compressed CO2 Antisolvent Technique. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c04378] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Avinash B. Lende
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Saurav Bhattacharjee
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Chung-Sung Tan
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
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Quintana SE, Hernández DM, Villanueva-Bermejo D, García-Risco MR, Fornari T. Fractionation and precipitation of licorice (Glycyrrhiza glabra L.) phytochemicals by supercritical antisolvent (SAS) technique. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109315] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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5
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Quintana SE, Villanueva-Bermejo D, Reglero G, García-Risco MR, Fornari T. Supercritical antisolvent particle precipitation and fractionation of rosemary (Rosmarinus officinalis L.) extracts. J CO2 UTIL 2019. [DOI: 10.1016/j.jcou.2019.07.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Purification of Polybutylene Terephthalate by Oligomer Removal Using a Compressed CO 2 Antisolvent. Polymers (Basel) 2019; 11:polym11071230. [PMID: 31340537 PMCID: PMC6680407 DOI: 10.3390/polym11071230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 07/19/2019] [Accepted: 07/21/2019] [Indexed: 11/16/2022] Open
Abstract
In this study, the cyclic oligomers in the highly chemically resistant polyester polybutylene terephthalate (PBT) were effectively removed using a compressed CO2 antisolvent technique in which 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) was used as the solvent. In addition to the oligomers, tetrahydrofuran was completely removed because of its low molecular weight and liquid state. The effects of the operating variables, including temperature, pressure, and the PBT concentration in HFIP, on the degree of removal of the oligomers were systematically studied using experimental design and the response surface methodology. The most appropriate operating conditions for the purification of PBT were 8.3 MPa and 23.4 °C when using 4.5 wt % PBT in HFIP. Under these conditions, the cyclic trimers and dimers could be removed by up to 81.4% and 95.7%, respectively, in a very short operating time.
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Prosapio V, De Marco I, Reverchon E. Supercritical antisolvent coprecipitation mechanisms. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.04.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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8
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Use of solvent mixtures in supercritical antisolvent process to modify precipitates morphology: Cellulose acetate microparticles. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2013.08.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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9
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Jin HY, Xia F, Zhao YP. Preparation of hydroxypropyl methyl cellulose phthalate nanoparticles with mixed solvent using supercritical antisolvent process and its application in co-precipitation of insulin. ADV POWDER TECHNOL 2012. [DOI: 10.1016/j.apt.2011.01.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Jin HY, Hemingway M, Xia F, Li SN, Zhao YP. Production of β-Carotene Nanoparticles by the Solution Enhanced Dispersion with Enhanced Mass Transfer by Ultrasound in Supercritical CO2 (SEDS-EM). Ind Eng Chem Res 2011. [DOI: 10.1021/ie2011565] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- He Yang Jin
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240
| | - Melinda Hemingway
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Fei Xia
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240
| | - Si Ning Li
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240
| | - Ya Ping Zhao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240
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11
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De Marco I, Reverchon E. Influence of pressure, temperature and concentration on the mechanisms of particle precipitation in supercritical antisolvent micronization. J Supercrit Fluids 2011. [DOI: 10.1016/j.supflu.2011.06.005] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12
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De Zordi N, Kikic I, Moneghini M, Solinas D. Piroxicam solid state studies after processing with SAS technique. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.06.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Torino E, De Marco I, Reverchon E. Organic nanoparticles recovery in supercritical antisolvent precipitation. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.06.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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14
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Precipitation and encapsulation of β-carotene in PHBV using carbon dioxide as anti-solvent. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.02.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Dalvi SV, Dave RN. Controlling Particle Size of a Poorly Water-Soluble Drug Using Ultrasound and Stabilizers in Antisolvent Precipitation. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900248f] [Citation(s) in RCA: 159] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sameer V. Dalvi
- Otto H. York Department of Chemical, Biological and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102
| | - Rajesh N. Dave
- Otto H. York Department of Chemical, Biological and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102
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16
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17
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Reverchon E, Adami R, Caputo G, De Marco I. Spherical microparticles production by supercritical antisolvent precipitation: Interpretation of results. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2008.06.002] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Franceschi E, Kunita MH, Tres MV, Rubira AF, Muniz EC, Corazza ML, Dariva C, Ferreira SR, Oliveira JV. Phase behavior and process parameters effects on the characteristics of precipitated theophylline using carbon dioxide as antisolvent. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2007.09.031] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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20
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Reverchon E, De Marco I, Adami R, Caputo G. Expanded micro-particles by supercritical antisolvent precipitation: Interpretation of results. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2007.08.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Nanoparticles production by supercritical antisolvent precipitation: A general interpretation. J Supercrit Fluids 2007. [DOI: 10.1016/j.supflu.2007.04.013] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Hong HL, Suo QL, He WZ, Li CP. Formation of Carotene/Proanthocyanidin Composite Microparticles via the Solution-Enhanced Dispersion by Supercritical Fluids (SEDS) Process through Prefilming Atomization. Ind Eng Chem Res 2007. [DOI: 10.1021/ie070590a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hai Long Hong
- Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China
| | - Quan Ling Suo
- Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China
| | - Wen Zhi He
- Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China
| | - Chun Ping Li
- Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China
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23
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Adami R, Osséo LS, Huopalahti R, Reverchon E. Supercritical AntiSolvent micronization of PVA by semi-continuous and batch processing. J Supercrit Fluids 2007. [DOI: 10.1016/j.supflu.2007.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Preparation of biodegradable microspheres by anionic dispersion polymerization with PLA copolymeric dispersion stabilizer. Colloid Polym Sci 2007. [DOI: 10.1007/s00396-007-1701-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Micronization of the officinal component baicalin by SEDS-PA process. CRYSTAL RESEARCH AND TECHNOLOGY 2007. [DOI: 10.1002/crat.200610876] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Feng X, Zhang J, Chen J, Han B, Shen D. Enhanced Solubilization of Bovine Serum Albumin in Reverse Micelles by Compressed CO2. Chemistry 2006; 12:2087-93. [PMID: 16358346 DOI: 10.1002/chem.200500812] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The effect of compressed CO2 on the solubilization of bovine serum albumin (BSA) in water/sodium bis-(2-ethylhexyl) sulfosuccinate (AOT)/isooctane reverse micelles was studied by observing phase behavior and recording UV-visible spectra under different conditions. The pH values within the water cores of reverse micelles at different CO2 pressures were also determined. The solubilization capacity of the reverse micelles for the protein increased considerably as CO2 pressure increased within the low-pressure range, but decreased at higher CO2 pressures, so that the micelles eventually lost their ability to solubilize the protein. The effect of CO2 on the stability of the reverse micelles played an important role in the relationship between pressure and protein solubility. A "multicomplex" model was proposed to explain these effects. The different solublization capacities within different pressure ranges demonstrates the unique advantage of using compressed CO2 in the extraction of proteins with reverse micelles.
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Affiliation(s)
- Xiaoying Feng
- The Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080 (China)
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27
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He WZ, Suo QL, Hong HL, Li GM, Zhao XH, Li CP, A S. Supercritical Antisolvent Micronization of Natural Carotene by the SEDS Process through Prefilming Atomization. Ind Eng Chem Res 2006. [DOI: 10.1021/ie050993f] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wen Zhi He
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Quan Ling Suo
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Hai Long Hong
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Guang Ming Li
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Xiu Hua Zhao
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Chun Ping Li
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Shan A
- College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China, and School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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28
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Zhang J, Liu Z, Han B, Li Z, Yang G, Li J, Chen J. Preparation of silica and TiO2–SiO2 core–shell nanoparticles in water-in-oil microemulsion using compressed CO2 as reactant and antisolvent. J Supercrit Fluids 2006. [DOI: 10.1016/j.supflu.2005.06.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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29
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Jarmer DJ, Lengsfeld CS, Anseth KS, Randolph TW. Supercritical fluid crystallization of griseofulvin: crystal habit modification with a selective growth inhibitor. J Pharm Sci 2005; 94:2688-702. [PMID: 16258994 DOI: 10.1002/jps.20463] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Poly (sebacic anhydride) (PSA) was used as a growth inhibitor to selectively modify habit of griseofulvin crystals formed via the Precipitation with a compressed-fluid antisolvent (PCA) process. PSA and griseofulvin were coprecipitated within a PCA injector, which provided efficient mixing between the solution and compressed antisolvent process streams. Griseofulvin crystal habit was modified from acicular to bipyramidal when the mass ratio of PSA/griseofulvin in the solution feed stream was <or=1:1. The habit modification was attributed to the preferential adsorption of PSA to the fastest growing crystal face of the acicular crystal form, which inhibited growth. Scanning electron microscopy (SEM) was used to characterize the griseofulvin and PSA particles, and gave results consistent with a selective growth inhibition mechanism. SEM micrographs showed regions on griseofulvin crystals where PSA microparticles had preferentially adsorbed. X-ray powder diffraction (XRPD) and differential scanning calorimetry (DSC) analysis of the griseofulvin crystals indicated no changes in the crystalline form after the habit modification. Powder compressibility decreased from 49 +/- 3% to 28 +/- 7% with the modification in crystal habit. No change in the physical stability of the processed powder was observed after being stored at 25 degrees C/60% RH and 40 degrees C/70% RH for 23 days. Despite the change in crystal habit, griseofulvin crystals achieved 100% dissolution within 60 min in a simulated gastric fluid.
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Affiliation(s)
- Daniel J Jarmer
- Department of Chemical and Biological Engineering, University of Colorado at Boulder, Center for Pharmaceutical Biotechnology, Boulder, Colorado, USA
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31
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de Diego YP, Pellikaan H, Wubbolts F, Witkamp G, Jansens P. Operating regimes and mechanism of particle formation during the precipitation of polymers using the PCA process. J Supercrit Fluids 2005. [DOI: 10.1016/j.supflu.2004.12.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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33
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Suo QL, He WZ, Huang YC, Li CP, Hong HL, Li YX, Zhu MD. Micronization of the natural pigment-bixin by the SEDS process through prefilming atomization. POWDER TECHNOL 2005. [DOI: 10.1016/j.powtec.2005.05.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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Measurement and correlation of vapor-liquid equilibria of the binary carbon dioxide-chloroform mixture system. KOREAN J CHEM ENG 2005. [DOI: 10.1007/bf02719428] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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35
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Li J, Zhang J, Han B, Wang Y, Gao L. Compressed CO2-enhanced solubilization of 1-butyl-3-methylimidazolium tetrafluoroborate in reverse micelles of Triton X-100. J Chem Phys 2004; 121:7408-12. [PMID: 15473812 DOI: 10.1063/1.1798031] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We carried out the first study about the effect of a compressed gas on the properties of reverse micellar solutions with ionic liquid (IL) polar cores. And the properties of compressed CO2/cyclohexane/1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4])/Triton X-100 (TX-100) system were investigated at 288.2, 293.2, 298.2, 308.2 K and different pressures by using phase behavior measurement, small-angle x-ray scattering, and UV-Vis techniques. The concentration of the surfactant in the solution was 0.3 mol/l (M). It was found that compressed CO2 could enhance solubilization of the IL in the reverse micelles considerably at suitable pressures, and formation of the reverse micelles could be controlled easily by pressure. Increase of CO2 pressure resulted in decrease of the micellar sizes at fixed [bmim][BF4]-to-surfactant molar ratios (w), and the size of the reverse micelles increased with the increase of w values. The polarity of the IL cores increased continuously with increasing w value.
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Affiliation(s)
- Junchun Li
- Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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36
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Pérez Y, Wubbolts FE, Witkamp GJ, Jansens PJ, de Loos T. Improved PCA process for the production of nano- and microparticles of polymers. AIChE J 2004. [DOI: 10.1002/aic.10210] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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He WZ, Suo QL, Jiang ZH, A S, Hong HL. Precipitation of ephedrine by SEDS process using a specially designed prefilming atomizer. J Supercrit Fluids 2004. [DOI: 10.1016/j.supflu.2004.01.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Zhang J, Xiao M, Liu Z, Han B, Jiang T, He J, Yang G. Preparation of ZnS/CdS composite nanoparticles by coprecipitation from reverse micelles using CO2 as antisolvent. J Colloid Interface Sci 2004; 273:160-4. [PMID: 15051446 DOI: 10.1016/j.jcis.2004.02.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2003] [Accepted: 02/06/2004] [Indexed: 11/16/2022]
Abstract
The possibility of simultaneously recovering ZnS and CdS particles from reverse micelles by dissolving antisolvent CO2 into the micellar solution was investigated by high-pressure UV-Vis spectra. It was found that all the ZnS and CdS particles in the reverse micelles could be precipitated by compressed CO2 at suitable pressures. The phase structures and morphologies of the obtained composites were characterized by X-ray diffraction and transmission electronic micrographs. The results illustrate that the smaller molar ratio of water to surfactant of the reverse micelles and higher pressure of CO2 are favorable for producing smaller particles. This method has many potential advantages for the production of composite nanoparticles.
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Affiliation(s)
- Jianling Zhang
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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Li Z, Mu T, Jiang T, Du J, Zhao G, Zhang J, Han B, Huang Y. Tautomeric equilibrium of ethyl acetoacetate in compressed CO2 + ethanol and CO2 + methanol mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:1055-1059. [PMID: 15084322 DOI: 10.1016/s1386-1425(03)00336-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2003] [Accepted: 07/23/2003] [Indexed: 05/24/2023]
Abstract
Tautomerism equilibrium of ethyl acetoacetate (EAA) in compressed CO2 + methanol and CO2 + ethanol mixtures was studied by UV-Vis spectroscopy at 308.15 K and different pressures. The volume expansion coefficient (alpha) of the solvents at different pressures was also determined. The relative permittivity (epsilon) of CO2 + methanol and CO2 + ethanol mixtures at different conditions was calculated using the Kc and Onsager solvent parameter. The equilibrium constant (Kc) of EAA in the binary mixtures increases considerably with increasing pressure or volume expansion coefficient. The relative permittivity or the polarity of the binary mixtures decreases sharply with increasing volume expansion coefficient in the range of 0 < alpha < 1.5. However, as the volume expansion coefficient exceeds 1.5, the relative permittivity decreases slowly. In other words, the dissolution of CO2 in the polar solvents can reduce the polarity of the solvents significantly in the low volume expansion coefficient range, and the polarity of the solution is not sensitive to the volume expansion coefficient as its value is large enough. The difference in polarity of the two solvents reduces with increasing pressure and becomes negligible after volume expansion coefficient exceeds about 2.5.
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Affiliation(s)
- Zhonghao Li
- Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, PR China
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40
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Preparation of polyacrylamide/CdS nanocomposites by a combination of reverse microemulsion and CO2 antisolvent techniques. Colloid Polym Sci 2004. [DOI: 10.1007/s00396-004-1058-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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41
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Zhang J, Liu Z, Han B, Jiang T, Wu W, Chen J, Li Z, Liu D. Preparation of Polystyrene-Encapsulated Silver Nanorods and Nanofibers by Combination of Reverse Micelles, Gas Antisolvent, and Ultrasound Techniques. J Phys Chem B 2004. [DOI: 10.1021/jp036408a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jianling Zhang
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Zhimin Liu
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Buxing Han
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Tao Jiang
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Weize Wu
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Jing Chen
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Zhonghao Li
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Dongxia Liu
- Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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42
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Li Z, Zhang J, Du J, Mu T, Liu Z, Chen J, Han B. Preparation of cadmium sulfide/poly(methyl methacrylate) composites by precipitation with compressed CO2. J Appl Polym Sci 2004. [DOI: 10.1002/app.21042] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Vega-González A, Domingo C, Elvira C, Subra P. Precipitation of PMMA/PCL blends using supercritical carbon dioxide. J Appl Polym Sci 2003. [DOI: 10.1002/app.13402] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Zhang J, Han B, Liu J, Zhang X, Yang G, He J, Liu Z, Jiang T, Wang J, Dong B. Effect of compressed CO2 on the size and stability of reverse micelles: Small-angle x-ray scattering and phase behavior study. J Chem Phys 2003. [DOI: 10.1063/1.1534581] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Liu J, Han B, Zhang R, Liu Z, Jiang T, Yang G. Effect of antisolvent carbon dioxide on the polymerization of methyl methacrylate in different solvents. J Supercrit Fluids 2003. [DOI: 10.1016/s0896-8446(02)00039-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hsu RY, Tan CS, Chen JM. Formation of micron-sized cycloolefin copolymer from toluene solution using compressed HFC-134a as antisolvent. J Appl Polym Sci 2002. [DOI: 10.1002/app.10543] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rogers TL, Johnston KP, Williams RO. Solution-based particle formation of pharmaceutical powders by supercritical or compressed fluid CO2 and cryogenic spray-freezing technologies. Drug Dev Ind Pharm 2001; 27:1003-15. [PMID: 11794803 DOI: 10.1081/ddc-100108363] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Micronization is an important procedure used in the pharmaceutical industry to reduce the particle size of active pharmaceutical ingredients (APIs). The spray-drying and milling techniques presently used to micronize drug substances cannot be used to process thermolabile or physically unstable drug substances. Therefore, new micronization techniques, including particle precipitation with supercritical or compressed fluid CO2 and spray-freezing of drug solutions and suspensions into cryogenic gas to produce solid frozen microparticles, are currently being perfected for future use in the pharmaceutical industry. This review highlights the compressed gas and cryogenic liquid technologies being developed as potential solution-based particle formation technologies for drugs that cannot be processed by conventional micronization techniques.
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Affiliation(s)
- T L Rogers
- College of Pharmacy, University of Texas at Austin, 78712-1074, USA
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Moneghini M, Kikic I, Voinovich D, Perissutti B, Filipović-Grcić J. Processing of carbamazepine-PEG 4000 solid dispersions with supercritical carbon dioxide: preparation, characterisation, and in vitro dissolution. Int J Pharm 2001; 222:129-38. [PMID: 11404039 DOI: 10.1016/s0378-5173(01)00711-6] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The purpose of this study was to apply the attractive technique of the supercritical fluid to the preparation of solvent-free solid dispersions. In particular, the gas antisolvent crystallisation technique (GAS), using supercritical carbon dioxide as processing medium, has been considered to prepare an enhanced release dosage form for of the poorly soluble carbamazepine, employing PEG 4000 as a hydrophilic carrier. The physical characterisation of the systems using laser granulometer, powder X-ray diffraction, thermal analyses, and scanning electron microscopy was carried out in order to understand the influence of this technological process on the physical status of the drug. The results of the physical characterisation attested a substantial correspondence of the solid state of the drug before and after treatment with GAS technique, whereas a pronounced change in size and morphology of the drug crystals was noticed. The dramatic reduction of the dimensions and the better crystal shape, together with the presence of the hydrophilic polymer determined a remarkable enhancement of the in vitro drug dissolution rate.
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Affiliation(s)
- M Moneghini
- Department of Pharmaceutical Sciences, University of Trieste, Piazzale Europa 1, 34127, Trieste, Italy.
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