Supercritical fluids processing: preparation of protein microparticles and their stablilisation
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United States of America Patent
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Jul 31, 2007
Grant Date -
Mar 24, 2005
app pub date -
Oct 21, 2002
filing date -
Oct 22, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the co-precipitation of a substance with a stabilizer therefor, by a gas anti solvent process comprising introducing into a particle formation vessel a supercritical fluid pure or mixed with a modifier; and a solution comprising said substance and said stabilizer dissolved in a solvent; so as said solvent is extracted from the solution by said supercritical fluid and co-precipitation of the substance and stabilizer occurs. The process may be carried out using an apparatus, for example, shown in FIG. 1, comprising a particle formation vessel (22) and a nozzle (27) having a central orifice (39) serving to introduce a solution of the substance and a plurality of outer orifices (41) serving to carry a flow of supercritical fluid into the particle formation vessel (22), such that the solvent is extracted from the solution by the supercritical fluid and precipitation of micron sized particles of the substance/stabilizer occurs.
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