Microprecipitation of nanoparticulate pharmaceutical agents
First Claim
1. A process of forming nanoparticulate dispersions of pharmaceutical agents comprising:
- first step of dissolution of the pharmaceutical agent in aqueous base,a second step of adding to it an aqueous solution of one or more surface modifiers anda third step of neutralizing the formed alkaline solution with an acid to form a dispersion.
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Abstract
This invention describes the preparation of nanoparticulate pharmaceutical agent dispersion via a process that comprises the dissolution of the said pharmaceutical agent in an alkaline solution and then neutralizing the said solution with an acid in the presence of a suitable surface-modifying, surface-active agent to form a fine particle dispersion of the said pharmaceutical agent. This can be preferably followed by steps of diafiltration clean-up of the dispersion and then concentration of it to a desired level. This process of dispersion preparation leads to microcrystalline particles of Z-average diameters smaller than 400 nm as measured by photon correlation spectroscopy. Various modification of precipitation schemes are described, many of which are suitable for large-scale manufacture of these agent dispersions.
304 Citations
55 Claims
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1. A process of forming nanoparticulate dispersions of pharmaceutical agents comprising:
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first step of dissolution of the pharmaceutical agent in aqueous base, a second step of adding to it an aqueous solution of one or more surface modifiers and a third step of neutralizing the formed alkaline solution with an acid to form a dispersion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27)
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13. A process of preparing an aqueous dispersion of a pharmaceutical agent comprising:
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continuously providing a first solution comprising water and surface modifier or a mixture thereof, continuously providing a second solution comprising a pharmaceutical agent in aqueous base to mix with the first flow, and immediately neutralizing with an acid solution to precipitate nanoparticulate dispersion of said pharmaceutical agent as fine particle colloidal dispersions of said pharmaceutical agent, followed by a salt removal step by diafiltration or dialysis and then a step of concentrating the dispersion. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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28. A process of preparing an aqueous dispersions of a pharmaceutical agent comprising:
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continuously providing a first flow of a solution comprising water and surface modifier or a mixture thereof, continuously providing a second flow of a second solution comprising a pharmaceutical agent in aqueous base, and continuously providing third flow of a neutralizing acid solution, and mixing the three flows continuously to precipitate a nanoparticulate dispersion of said pharmaceutical agent to form a fine particle dispersion of the said pharmaceutical agent, followed by a salt removal step by diafiltration or dialysis and then a step of concentrating the said dispersion. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 54, 55)
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41. A process of preparing an aqueous dispersions of a pharmaceutical agent comprising:
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continuously providing a first solution comprising water and surface modifier or a mixture thereof into a solution comprising a pharmaceutical agent in aqueous base to form a first flow, and then neutralizing the first flow with a second flow of an acid solution at a desired pH to form a fine particle dispersion of a pharmaceutical agent, followed by a step of salt removal by diafiltration or dialysis and then a step of concentrating the said dispersion.
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53. A process of preparing aqueous dispersions of a pharmaceutical agent comprising:
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continuously providing a first solution comprising water and surface modifier or a mixture thereof into a solution comprising a pharmaceutical agent in aqueous base to form a first flow, and then neutralizing the first flow with a second flow of an acid solution at a desired pH to form a fine particle dispersion of a pharmaceutical agent, followed by a step of salt removal by diafiltration or dialysis and then a step of concentrating the said dispersion.
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Specification