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• W2000455148 abstract "Retinyl acetate (RA) was selected as a model compound to be entrapped in poly(lactic‐co‐glycolic)acid (PLGA) microspheres using supercritical emulsion extraction (SEE). Several oil‐in‐water emulsions prepared using acetone and aqueous glycerol (80% glycerol, 20% water) were processed using supercritical carbon dioxide (SC‐CO2) to extract the oily phase and to induce microspheres formation. The characteristics of the microspheres obtained by conventional liquid emulsion extraction and SEE were also compared: SEE produced spherical and free flowing microspheres, whereas the conventional liquid–liquid extraction showed large intraparticles aggregation. Emulsion extraction by SC‐CO2 technology was tested using two different operation layouts: batch (SEE‐B) and continuous (SEE‐C). SEE‐C was performed using a packed tower to produce emulsion/SC‐CO2 contact in countercurrent mode, allowing higher microsphere recovery and process efficiencies. Operating at 80 bar and 36°C, SEE‐C produced PLGA/RA microspheres with mean sizes between 3.3 and 4.5 μm with an excellent encapsulation efficiency of 80%–90%. Almost all the drug was released in about 6 days when charged at 2.7% (w/w), whereas only 40% and 10% of RA were released in the same period of time when the charge was 5.2% and 8.8% (w/w), respectively. Release kinetics constants calculated from the experimental data, using a mathematical model, were also proposed and discussed. © 2011 Wiley‐Liss, Inc. and the American Pharmacists Association J Pharm Sci 100:4357–4367, 2011" @default.
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• W2000455148 date "2011-10-01" @default.
• W2000455148 modified "2023-10-03" @default.
• W2000455148 title "PLGA microdevices for retinoids sustained release produced by supercritical emulsion extraction: Continuous versus batch operation layouts" @default.
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• W2000455148 doi "https://doi.org/10.1002/jps.22647" @default.
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