Improvements in the stabilisation of biological materials

A - Human Necessities – 61 – K

Patent

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A61K 9/16 (2006.01)

Patent

CA 2618996

Biological materials such as vaccines can be stabilised in certain glassy materials, soluble in water. It has been proposed to form these glassy materials as a powder suspended in a non-aqueous liquid for injection into a patient. There is a problem in maintaining the suspension because the particles tend to sink to the bottom. The problem is solved by adding a blowing agent into a solution for which the glass is formed. The blowing agent decomposes as the solution evaporates thereby forming cavities in the resulting glass structure, reducing its density to match that of the liquid in which it is to be suspended. Other uses for the invention are in compositions intended for inhalation and for rapid dissolution in aqueous solutions immediately before use.

Il est possible de stabiliser des matériaux biologiques tels que des vaccins dans certains matériaux vitreux solubles dans l'eau. Des techniques antérieures consistaient à produire lesdits matériaux vitreux sous forme de poudre en suspension dans un liquide non aqueux destiné à être injecté dans l'organisme d'un patient. Il était toutefois difficile de maintenir la suspension, car les particules avaient tendance à tomber au fond. L'invention permet de régler ce problème, par l'ajout d'un gonflant dans une solution contenant le matériau vitreux. Ledit gonflant se décompose lors de l'évaporation de la solution, ce qui permet de former des cavités dans la structure vitreuse obtenue, et de réduire la densité du gonflant pour qu'elle coïncide avec celle du liquide dans lequel il est mis en suspension. L'invention peut également être utilisée dans des compositions destinées à être inhalées et à être rapidement dissoutes dans des solutions aqueuses immédiatement avant utilisation.

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