Process for producing small particles of biologically active molecules
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United States of America Patent
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May 27, 2003
Issued Date -
N/A
app pub date -
Jan 21, 1993
filing date -
May 1, 1989
priority date (Note) -
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Abstract
Small diameter particles of biologically active molecules are produced by atomizing solutions of the molecules through a nozzle into very cold liquified gases, which immediately freeze the atomized droplets. The resulting frozen particles having diameters of approximately 10 to 90 micrometers are lyophilized to produce porous particles, suspended in a non-solvent for the molecules, and exposed to ultrasonic energy or homogenization to produce particles having diameters of 0.1 to 10 micrometers with greater than 70 to 95% of the initial biological activity of the molecules in solution.
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