Process for preparing microparticles having a low residual solvent volume
First Claim
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1. A process for preparing low residual solvent level microparticles, comprising:
- (a) providing a dispersed phase comprising a polymer excipient in a weight amount of a dispersed phase solvent, WDP solvent, wherein the polymer excipient comprises;
i) a non-water soluble block copolymer comprising a polyethylene glycol (PEG) hydrophilic block or blocks and a hydrophobic block or blocks;
orii) an admixture of non-water soluble block copolymers comprising a PEG hydrophilic block or blocks and a hydrophobic block or blocks;
oriii) an admixture of a PEG hydrophilic, water soluble biocompatible polymer; and
a non-water soluble, biocompatible and/or biodegradable polymer;
(b) combining the dispersed phase with a continuous phase processing medium to form an emulsion wherein the dispersed phase is a discontinuous phase in the continuous phase;
(c) combining the emulsion formed in (b) with a weight amount of an extraction phase solvent, WEP solvent, thereby forming microparticles;
wherein the WEP solvent comprises water or a mixture of water and a fully water-miscible solvent, and(d) isolating the microparticles;
wherein the amount of residual dispersed phase solvent present in the isolated microparticles is less than or equal to about 3 wt %, and is less than the amount of residual dispersed phase solvent present in microparticles produced by said process in the absence of PEG;
the total amount of extraction phase solvent is WEP solvent, total defined by the formula;
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Abstract
The disclosed processes for forming microparticles utilize low volumes of processing water while still providing microparticles having low residual solvent levels. The processes are adaptable to both continuous and batch processes using oil/water or water/oil or water/oil/water or oil/water/oil emulsions.
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49 Claims
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1. A process for preparing low residual solvent level microparticles, comprising:
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(a) providing a dispersed phase comprising a polymer excipient in a weight amount of a dispersed phase solvent, WDP solvent, wherein the polymer excipient comprises; i) a non-water soluble block copolymer comprising a polyethylene glycol (PEG) hydrophilic block or blocks and a hydrophobic block or blocks;
orii) an admixture of non-water soluble block copolymers comprising a PEG hydrophilic block or blocks and a hydrophobic block or blocks;
oriii) an admixture of a PEG hydrophilic, water soluble biocompatible polymer; and
a non-water soluble, biocompatible and/or biodegradable polymer;(b) combining the dispersed phase with a continuous phase processing medium to form an emulsion wherein the dispersed phase is a discontinuous phase in the continuous phase; (c) combining the emulsion formed in (b) with a weight amount of an extraction phase solvent, WEP solvent, thereby forming microparticles;
wherein the WEP solvent comprises water or a mixture of water and a fully water-miscible solvent, and(d) isolating the microparticles; wherein the amount of residual dispersed phase solvent present in the isolated microparticles is less than or equal to about 3 wt %, and is less than the amount of residual dispersed phase solvent present in microparticles produced by said process in the absence of PEG; the total amount of extraction phase solvent is WEP solvent, total defined by the formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification