Solubilization of pharmaceutical substances in an organic solvent and preparation of pharmaceutical powders using the same
First Claim
1. A method for making particles including a pharmaceutical material, which particles may be recovered in a powder form desirable for use in some pharmaceutical delivery methods such as inhalation for direct pulmonary delivery and injection in a slurry form, the method comprising the steps of:
- forming solid particles comprising a pharmaceutical substance from a liquid solution, which particles could be recovered in powder form;
said liquid solution comprising said pharmaceutical substance and an amphiphilic material in solution in a carrier liquidwherein, said pharmaceutical substance, alone, is substantially not soluble in said carrier liquid and said amphiphilic material is capable of interacting with said pharmaceutical substance such that said pharmaceutical substance, in combination with said amphiphilic material as a hydrophobic ion pair complex, is present in a true, homogeneous solution in said carrier liquid prior to said step of forming said solid particles.
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Accused Products
Abstract
Provided is a method for preparing a true, homogeneous solution of a pharmaceutical substance dissolved in an organic solvent in which the pharmaceutical substance is not normally soluble. Solubilization is obtained by forming a hydrophobic ion pair complex involving the pharmaceutical substance and an amphiphilic material. The resulting organic solution may be further processed to prepare pharmaceutical powders. A biodegradable polymer may be co-dissolved with the pharmaceutical substance and the amphiphilic material and may be incorporated into a pharmaceutical powder. A preferred method for preparing pharmaceutical powders is to subject the organic solution to gas antisolvent precipitation using a supercritical gas antisolvent such as carbon dioxide. Also provided is a method for making hollow particles having a fiber-like shape which would provide enhanced retention time in the stomach if ingested by a human or animal host.
186 Citations
31 Claims
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1. A method for making particles including a pharmaceutical material, which particles may be recovered in a powder form desirable for use in some pharmaceutical delivery methods such as inhalation for direct pulmonary delivery and injection in a slurry form, the method comprising the steps of:
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forming solid particles comprising a pharmaceutical substance from a liquid solution, which particles could be recovered in powder form; said liquid solution comprising said pharmaceutical substance and an amphiphilic material in solution in a carrier liquid wherein, said pharmaceutical substance, alone, is substantially not soluble in said carrier liquid and said amphiphilic material is capable of interacting with said pharmaceutical substance such that said pharmaceutical substance, in combination with said amphiphilic material as a hydrophobic ion pair complex, is present in a true, homogeneous solution in said carrier liquid prior to said step of forming said solid particles. - 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)
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Specification