Methods for fine powder formation

A - Human Necessities – 61 – K

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A61K 9/19 (2006.01) A61K 9/16 (2006.01) F26B 5/06 (2006.01)

Patent

CA 2367131

Improved methods for forming fine particles of a material have been developed, wherein the method steps include dissolving the material in a solvent to form a dilute solution, immobilizing the dilution solution, and then removing the solvent to yield particles of the material. Methods of immobilizing the dilute solution include freezing, gelation, and chelation. In a preferred embodiment, the immobilized solvent is removed by lyophilization, i.e. reducing the ambient pressure while avoiding application of sufficient heat to power a phase transition. Essentially any material and solvent for the material can be used in the methods described herein. Proteins and peptides in an aqueous solvent are the preferred systems.

L'invention concerne des procédés améliorés de formation de particules fines à partir d'une matière. Lesdits procédés consistent à dissoudre la matière dans un solvant de manière à former une solution diluée; immobiliser ladite solution diluée; puis retirer le solvant afin de recueillir des particules de ladite matière. Les procédés d'immobilisation de la solution diluée comprennent la congélation, la gélification et la chélation. Dans un mode de réalisation préféré, le solvant immobilisé est retiré par lyophylisation, c'est à dire, par réduction de la pression ambiante en évitant l'application d'une chaleur suffisante pour déclencher une phase de transition. Toute matière et tout solvant destiné à ladite matière, peut être utilisé dans les procédés selon l'invention. Les systèmes préférés sont ceux constitués de protéines et de peptides placés dans un solvant aqueux.

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