Freeze-dried composition of active substances
The invention relates to freeze-dried molded articles, containing ≧50% by wt. of one or more active substances, and ≦15% by wt. of one or more scaffold-forming agents, with proteins being excepted, as well as optionally one or more auxiliary substances, in each case based on the total composition of the freeze-dried molded article, whose 1% by wt. solution or suspension in water, at 20° C., has a pH value <7. Furthermore, the invention relates to methods for manufacturing these freeze-dried molded articles, the combination of such freeze-dried molded articles in kit-of-parts arrangements together with aqueous solutions, as well as the use of the freeze-dried molded articles and the kit-of-parts combinations for pharmaceutical and cosmetic application.
1. Freeze-dried molded article, comprising <50% by wt. of one or more active substances selected from the group of acid active substances having a pKa value < or equal to 7 at 25° C, and
≦15% by wt. of one or more scaffold-forming agents, with proteins being excepted,
as well as optionally one or more auxiliary substances,
in each case based on the total composition of the freeze-dried molded article, and whose 1% by wt. solution or suspension in water, at 20° C., has a pH value <7.
2. Freeze-dried molded article according to claim 1 , comprising a content of acid active substances of ≧75% by wt., based on the total composition of the freeze-dried molded article.
3. Freeze-dried molded article according to claim 1 , which, based on the total composition of the freeze-dried molded article, contains >50% by wt. of an active substance from the group of ascorbic acid and its derivatives or the group of salicylic acid and its derivatives.
4. Freeze-dried molded article according to claim 1 , with a content of scaffold-forming agents of <10% by wt. based on the total composition of the freeze-dried molded article.
5. Freeze-dried molded article according to claim 1 , wherein the scaffold-forming agents are selected from the group of the polysaccharides, polyaminosaccharides, glucosaminoglycanes and/or synthetic polymers or mixtures thereof.
6. Freeze-dried molded article according to claim 1 , whose 1% by wt. solution or suspension in water, at 20° C, has a pH value <pH 4.0.
7. Freeze-dried molded article according to claim 1 , which decomposes completely within ≦30 seconds when liquid is added.
8. Method for producing a freeze-dried molded article according to claim 1 , comprising the following steps:
(a) preparing an aqueous solution or suspension comprising one or more scaffold-forming agents, with proteins being excepted, one or more active substances, as well as one or more auxiliary substances,
(b) optionally adjusting the pH value of this aqueous solution or suspension to pH <7,
(c) pouring the mixture into a mold,
(d) freezing the mixture in the mold, and
(e) freeze drying the frozen mixture while forming the molded article.
9. Freeze-dried molded article that can be obtained in accordance with the method according to claim 8 .
10. Freeze-dried molded article according to claim 9 , which, based on the total composition of the freeze-dried molded article, contains >50 % by wt. of an active substance from the group of ascorbic acid and its derivatives or the group of salicylic acid and its derivatives.
11. Freeze-dried molded article according to claim 2 , which, based on the total composition of the freeze-dried molded article, contains >50% by wt. of an active substance from the group of ascorbic acid and its derivatives or the group of salicylic acid and its derivatives.
12. Freeze-dried molded article according to claim 10 , with a content of scaffold-forming agents of <10% by wt. based on the total composition of the freeze-dried molded article.