Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Matrices
Patent
1991-01-02
1996-01-16
Webman, Edward J.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Matrices
424482, 424463, 424487, 526263, 526265, 5263031, 5263076, 526291, 52629295, 526916, 5147726, 5147725, A61K 914, A61K 932, A61K 958, A61K 4732, C08F22006, C08F22052
Patent
active
054846102
ABSTRACT:
Terpolymers which are sensitive to pH and temperature are useful carriers for conducting bioactive agents through the gastric juices of the stomach in protected form. Such terpolymers swell at the higher physiologic pH of the intestinal tract causing release of the bioactive agents into the intestine. The terpolymers are linear and are made up of 35 to 99 wt % of a temperature sensitive component, which imparts to the terpolymer LCST (lower critical solution temperature) properties below body temperatures, 1 to 30 wt % of a pH sensitive component having a pK.sub.a in the range of from 2 to 8 which functions through ionization or deionization of carboxylic acid groups to prevent the bioactive agent from being lost at low pH but allows bioactive agent release at physiological pH of about 7.4 and a hydrophobic component which stabilizes the LCST below body temperatures and compensates for bioactive agent effects on the terpolymers. Such terpolymers provide for safe bioactive agent loading, a simple procedure for dosage form fabrication and the terpolymer functions as a protective carrier in the acidic environment of the stomach and also protects the bioactive agents from digestive enzymes until the bioactive agent is released in the intestinal tract.
REFERENCES:
patent: 3927199 (1975-12-01), Micchelli et al.
patent: 4395524 (1983-07-01), Emmons et al.
patent: 4795436 (1989-01-01), Robinson
patent: 4842852 (1989-06-01), Nowak, Jr. et al.
patent: 5037863 (1991-08-01), Kozakiewicz et al.
patent: 5047244 (1991-09-01), Sanvordeker et al.
patent: 5053228 (1991-10-01), Mori et al.
patent: 5057560 (1991-10-01), Mueller
Macromed, Inc.
Webman Edward J.
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