Methods for Making Compound Particles

Abstract

Compositions are provided that include having at least 95% by weight of a taxane, or a pharmaceutically acceptable salt thereof, where the particles have a mean bulk density between about 0.050 g/cm 3 and about 0.15 g/cm 3 , and/or a specific surface area (SSA) of at least 18 m 2 /g, 20 m 2 /g, 25 m 2 /g, 30 m 2 /g, 32 m 2 /g, 34 m 2 /g, or 35 m 2 /g. Methods for making and using such compositions are also provided.

We claim: 
     
         1 . A method for making compound particles, comprising:
 (a) introducing (i) a solution comprising at least one solvent and at least one solute comprising a compound of interest into a nozzle inlet, and (ii) a compressed fluid into an inlet of a vessel defining a pressurizable chamber;   (b) passing the solution out of a nozzle orifice and into the pressurizable chamber to produce an output stream of atomized droplets, wherein the nozzle orifice is located between 2 mm and 20 mm from a sonic energy source located within the output stream, wherein the sonic energy source produces sonic energy with an amplitude between 10% and 100% during the passing, and wherein the nozzle orifice has a diameter of between 20 μm and 125 μm; and   (c) contacting the atomized droplets with the compressed fluid, to cause depletion of the solvent from the atomized droplets, to produce compound particles,   wherein steps (a), (b), and (c) are carried out under supercritical temperature and pressure for the compressed fluid.   
     
     
         2 . The method of  claim 1 , further comprising:
 (d) contacting the atomized droplets produced in step (c) with an anti-solvent to cause further depletion of the solvent from the compound particles, wherein step (d) is carried out under supercritical temperature and pressure for the anti-solvent.   
     
     
         3 . The method of  claim 1 , wherein a flow rate of the solution through the nozzle has a range from about 0.5 mL/min to about 30 mL/min. 
     
     
         4 . The method of  claim 1 , wherein the sonic energy source comprises one of a sonic horn, a sonic probe, or a sonic plate. 
     
     
         5 . The method of  claim 1 , wherein the sonic energy source has a frequency of between about 18 kHz and about 22 kHz. 
     
     
         6 . The method of  claim 2 , further comprising:
 (e) receiving the plurality of particles through the outlet of the pressurizable chamber; and   (f) collecting the plurality of particles in a collection device.   
     
     
         7 . The method of  claim 1  wherein the compound is a taxane. 
     
     
         8 . The method of  claim 1 , wherein the compressed fluid is super critical carbon dioxide. 
     
     
         9 . The method of  claim 1 , wherein the anti-solvent is super critical carbon dioxide. 
     
     
         10 . The method of  claim 1 , wherein the compound is paclitaxel and the solvent comprises acetone. 
     
     
         11 . The method of  claim 1 , wherein the compound is docetaxel and the solvent comprises ethanol.