US4287214A
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Dithranol compositions stabilized with alpha hydroxyacids
Assignee: Individual
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Filing: 1979-09-24
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Granted: 1981-09-01
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Expires: 1999-09-24
Abstract
Abstract Chemically stable dithranol compositions useful as topical treatment for inflammatory disorders such as psoriasis, eczema and seborrheic dermatitis are disclosed. Incorporation of a certain alpha hydroxyacid as its free acid, lactone, amide or salt form in dithranol containing compositions has been found to chemically stabilize said compositions. The alpha hydroxyacids include glyceric acid, gluconic acid, galacturonic acid, glucuronic acid, glucoheptonic acid, galactonic acid, malic acid, mucic acid, citric acid, saccharic acid, tartaric acid, tartronic acid, isocitric acid and glucuronamide. A single member of the above alpha hydroxyacids may be present in a total amount of from 0.01 to 1 percent by weight of the total composition, or a plurality thereof may be present in a preferred concentration range of from 0.02 to 0.5 percent by weight of the total composition.
Inventors
- 👤 Eugene J. Van Scott
- 👤 Ruey J. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:21
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0014; A61K31/00; A61K31/045; A61K31/05; A61K47/00; A61K47/06; A61K47/08; A61K47/12; A61K47/16; A61K47/18; A61K47/26; A61K8/00; A61K8/02; A61K8/04; A61K8/06; A61K8/064; A61K8/18; A61K8/30; A61K8/33; A61K8/34; A61K8/347; A61K8/36; A61K8/365; A61Q; A61Q19/00; A61K2800/00; A61K2800/40; A61K2800/52
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
126 words
In a composition containing a anti-inflammatory effective amount of dithranol in a pharmaceutically acceptable vehicle for topical application, the improvement comprising: a stabilizing effective amount of at least one member selected from the group consisting of: a glyceric acid or a derivative thereof having the formula R(CR.sub.1 OH).sub.n COOH wherein n=2,3,4,5,6, or 7 and R,R 1 =H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone or amide thereof; and an alpha hydroxy polycarboxylic or a derivative thereof having the formula (CRX).sub.m (COOH).sub.n wherein m=1,2,3,4,5, or 6 n=2,3,4 and X=OH or H when m≧2 and with one or more than one OH group present. R=H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone, amide or salt thereof.
Claim 2
Dependent Claim
126 words
In a composition containing a anti-inflammatory effective amount of dithranol in a pharmaceutically acceptable vehicle for topical application, the improvement comprising: a stabilizing effective amount of at least one member selected from the group consisting of: a glyceric acid or a derivative thereof having the formula R(CR.sub.1 OH).sub.n COOH wherein n=2,3,4,5,6, or 7 and R,R 1 =H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone or amide thereof; and an alpha hydroxy polycarboxylic or a derivative thereof having the formula (CRX).sub.m (COOH).sub.n wherein m=1,2,3,4,5, or 6 n=2,3,4 and X=OH or H when m≧2 and with one or more than one OH group present. R=H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone, amide or salt thereof.
Claim 3
Dependent Claim
38 words
The composition of claim 1 wherein said member is a compound selected from the group consisting of: ______________________________________
Glyceric acid Galatonolactone
Gluconic acid Glucuronic acid
Glucoheptonic acid
Glucuronolactone
Glucoheptonolactone
Galacturonic acid
Galactonic acid Galacturonolactone, and
Gluconolactone Glucuronamide
______________________________________
Claim 4
Dependent Claim
65 words
The composition of claim 1 wherein said member is a compound selected from the group consisting of: ______________________________________
Tartronic acid Mucic acid lactone
Malic acid Saccharic acid monopotassium salt
Tartaric acid Saccharic acid monosodium salt
Citric acid Saccharic acid monoammonium salt
Isocitric acid Tartaric acid monoamide
Saccharic acid Citric acid diamide
Mucic acid Tartaric acid monoethyl ester, and
Saccharic acid lactone
Isocitric acid lactone
______________________________________
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein dithranol is present in a concentration of from 0.01 to 0.5 percent, by weight of the total composition.
Claim 6
Dependent Claim
18 words
The composition of claim 4 wherein the concentration of dithranol is no more than 0.1 percent, by weight.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein the member is present in a concentration of 0.01 to 1 percent by weight of the total composition.
Claim 8
Dependent Claim
19 words
The composition of claim 6 wherein said member is present in a concentration of from 0.02 to 0.5 percent.
Claim 9
Dependent Claim
10 words
The composition of claim 1 wherein said vehicle is anhydrous.
Claim 10
Dependent Claim
12 words
The composition of claim 1 wherein said vehicle is a water-in-oil emulsion.
Claim 11
Independent Claim
146 words
A method for stabilizing a dithranol containing composition wherein an anti-inflammatory effective amount of dithranol is admixed with a pharmaceutically acceptable vehicle for topical application to predetermined areas of the human body comprising: admixing in said composition a chemical stabilizing effective amount against oxidation in air and water of at least one member selected from the group consisting of: glyceric acid or a derivative thereof having the formula R(CR.sub.1 OH).sub.n COOH wherein n=2,3,4,5,6 or 7, and R,R 1 =H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone or amide thereof; and an alphahydroxy polycarboxylic acid or a derivative thereof having the formula (CRX).sub.m (COOH).sub.n wherein m=1,2,3,4,5, or 6 n=2,3,4, and X=OH or H when m≧2 and with at least one OH group present R=H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone amide or salt thereof.
Claim 12
Independent Claim
146 words
A method for stabilizing a dithranol containing composition wherein an anti-inflammatory effective amount of dithranol is admixed with a pharmaceutically acceptable vehicle for topical application to predetermined areas of the human body comprising: admixing in said composition a chemical stabilizing effective amount against oxidation in air and water of at least one member selected from the group consisting of: glyceric acid or a derivative thereof having the formula R(CR.sub.1 OH).sub.n COOH wherein n=2,3,4,5,6 or 7, and R,R 1 =H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone or amide thereof; and an alphahydroxy polycarboxylic acid or a derivative thereof having the formula (CRX).sub.m (COOH).sub.n wherein m=1,2,3,4,5, or 6 n=2,3,4, and X=OH or H when m≧2 and with at least one OH group present R=H, CHO, or alkyl having from 1 to 7 carbon atoms, or the lactone amide or salt thereof.
Claim 13
Dependent Claim
38 words
The method of claim 10 wherein said member is a compound selected from the group consisting of ______________________________________
Glyceric acid Glucuronic acid
Gluconic acid Glucuronolactone
Gluconolactone Galacturonic acid
Glucoheptonic acid
Galacturonolactone acid
Glucoheptonolactone
Glucuronamide
Galactonic acid
Galactonolactone
______________________________________
Claim 14
Dependent Claim
65 words
The method of claim 10 wherein said member is a compound selected from the group consisting of ______________________________________
Tartronic acid Mucic acid lactone
Malic acid Saccharic acid monopotassium salt
Tartaric acid Saccharic acid monosodium salt
Citric acid Saccharic acid monoammonium salt
Isocitric acid Tartaric acid monoamide
Saccharic acid Citric acid diamide
Mucic acid Tartaric acid monoethyl ester, and
Saccharic acid lactone
Isocitric acid lactone
______________________________________
Claim 15
Dependent Claim
25 words
The method of claim 10 wherein said member is present in a concentration of from 0.01 to 1 percent by weight of the total composition.
Claim 16
Dependent Claim
19 words
The method of claim 13 wherein said member is present in a concentration of from 0.02 to 0.5 percent.
Claim 17
Dependent Claim
35 words
The method of claim 10 wherein said member is initially dissolved in a solvent selected from the group consisting of water and alcohol and the solution admixed with said vehicle for incorporation into said composition.
Claim 18
Dependent Claim
38 words
The method of claim 10 wherein dithranol is dissolved in a solvent selected from the group consisting of acetone, ethanol, propylene glycol, 1-3 butanediol, isopropyl myristate, isopropyl palmitate and mineral oil and the solution admixed with said vehicle.
Claim 19
Dependent Claim
23 words
The method of claim 10 wherein dithranol is present in a concentration of 0.01 to 0.5 percent by weight of the total composition.
Claim 20
Dependent Claim
20 words
The method of claim 17 wherein dithranol is present in a concentration of from 0.01 to 0.1 percent by weight.
Claim 21
Dependent Claim
26 words
The method of claim 16 wherein said solvent is present in a concentration of from 0.5 to about 25 percent by volume of the total composition.
Claim 22
Dependent Claim
17 words
The method of claim 19 wherein said solvent is present in from 0.5 to about 5 percent.
Claim 23
Dependent Claim
23 words
The method of claim 15 wherein said solvent is water present in from 0.01 to 1 percent by volume of the total composition.
Claim 24
Dependent Claim
17 words
The method of claim 21 wherein water is present in a concentration of 0.02 to 0.2 percent.
Claim 25
Dependent Claim
10 words
The method of claim 10 wherein said vehicle is anhydrous.
Claim 26
Dependent Claim
12 words
The method of claim 10 wherein said vehicle is a water-in-oil emulsion.
References Cited (Backward Citations)
US3920835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |