Residual solvent extraction method and microparticles produced thereby
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United States of America Patent
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app pub date -
Jul 13, 2007
filing date -
Aug 31, 2001
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Abstract
Methods for preparing microparticles having reduced residual solvent levels. Microparticles are contacted with a non-aqueous washing system to reduce the level of residual solvent in the microparticles. Preferred non-aqueous washing systems include 100% ethanol and a blend of ethanol and heptane. A solvent blend of a hardening solvent and a washing solvent can be used to harden and wash microparticles in a single step, thereby eliminating the need for a post-hardening wash step.
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