Preparation of diagnostic agents
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United States of America Patent
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May 21, 1996
Grant Date -
N/A
app pub date -
Mar 15, 1993
filing date -
Apr 10, 1991
priority date (Note) -
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Abstract
Microcapsules are prepared by a process comprising the steps of (i) spray-drying a solution or dispersion of a wall-forming material in order to obtain intermediate microcapsules and (ii) reducing the water-solubility of at least the outside of the intermediate microcapsules. Suitable wall-forming materials include proteins such as albumin and gelatin. The microcapsules have walls of 40-500 nm thick and are useful in ultrasonic imaging. The control of median size, size distribution and degree of insolubilization and cross-linking of the wall-forming material allows novel microsphere preparations to be produced.
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