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US4138212A
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Process for producing water and oil soluble curcumin coloring agents
Assignee: Individual
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Filing: 1977-08-10
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Granted: 1979-02-06
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Expires: 1997-08-10
Abstract
Abstract Water soluble curcumin coloring agent is produced from ground turmeric root by washing the root with a soap solution in which the curcumin dissolves. A subsequent treatment of the solution with acid precipitates the curcumin and produces a paste or putty which is dispersible in fatty based substances.
Inventors
- 👤 Charles E. Stransky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:25
CPC Classifications
C; C09; C09B; C09B61/00; A; A23; A23L; A23L5/00; A23L5/40; A23L5/42; A23L5/43
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
78 words
A method of making a water soluble liquid curcumin - containing coloring agent from turmeric root, which agent is suitable for coloring food, comprising the steps of: mixing ground turmeric root and aqueous soap solution consisting essentially of the reaction product of a vegetable oil and an alkali metal hydroxide to dissolve the curcumin in the root into the liquid, and separating the root and liquid so the liquid may be used as the coloring agent in food.
Claim 2
Independent Claim
78 words
A method of making a water soluble liquid curcumin - containing coloring agent from turmeric root, which agent is suitable for coloring food, comprising the steps of: mixing ground turmeric root and aqueous soap solution consisting essentially of the reaction product of a vegetable oil and an alkali metal hydroxide to dissolve the curcumin in the root into the liquid, and separating the root and liquid so the liquid may be used as the coloring agent in food.
Claim 3
Dependent Claim
23 words
The method as in claim 1 wherein: the soap in said solution comprises the reaction product of castor oil and alkali metal hydroxide.
Claim 4
Dependent Claim
26 words
The method as in claim 1 including heating the mixture of turmeric root and soap solution to a temperature of up to 60° C. during mixing.
Claim 5
Dependent Claim
29 words
The method as in claim 1 including heating the mixture of turmeric root and soap solution to a temperature of about 90° C. before separating said root and liquid.
Claim 6
Dependent Claim
77 words
The method as in claim 1 including the additional steps for using said separated liquid to produce a form of curcumin coloring agent that is soluble in fatty based products, said additional steps comprising: adding sufficient acid to said liquid to effect precipitation of a material which contains the curcumin and is bright yellow in color, and separating the liquid and the material so the material may be used in fatty based products as a coloring agent.
Claim 7
Independent Claim
145 words
A method of making a water soluble liquid curcumin - containing coloring agent from turmeric root, which agent is suitable for coloring food, comprising the steps of: placing a quantity of ground turmeric root in a vessel, washing said ground root in said vessel with a first solution for removing at least some of the camphor and other undesirable constituents from said root, separating the washing solution from said root to obtain the residual washed root, then mixing said residual root and an aqueous soap solution consisting essentially of the reaction product of a vegetable oil and an alkali metal hydroxide for dissolving the curcumin in the root into the soap solution and heating the mixture during mixing, and then separating the ground spent root from the liquid containing the soap and curcumin so the liquid may be used as the coloring agent in food.
Claim 8
Independent Claim
145 words
A method of making a water soluble liquid curcumin - containing coloring agent from turmeric root, which agent is suitable for coloring food, comprising the steps of: placing a quantity of ground turmeric root in a vessel, washing said ground root in said vessel with a first solution for removing at least some of the camphor and other undesirable constituents from said root, separating the washing solution from said root to obtain the residual washed root, then mixing said residual root and an aqueous soap solution consisting essentially of the reaction product of a vegetable oil and an alkali metal hydroxide for dissolving the curcumin in the root into the soap solution and heating the mixture during mixing, and then separating the ground spent root from the liquid containing the soap and curcumin so the liquid may be used as the coloring agent in food.
Claim 9
Dependent Claim
21 words
The method as in claim 6 wherein said soap is the reaction product of castor oil and an alkali metal hydroxide.
Claim 10
Dependent Claim
38 words
The method as in claim 6 wherein the reactants forming said soap in said aqueous solution are about 1 part by volume of an alkali metal hydroxide having 45° liquid gravity and about 2.25 parts of castor oil.
Claim 11
Dependent Claim
16 words
The method as in claim 8 wherein said acid is glacial acetic acid dissolved in water.
Claim 12
Dependent Claim
26 words
The method as in claim 6 wherein the mixture of root and soap solution is heated to a temperature of about 60° C. during said mixing.
Claim 13
Dependent Claim
23 words
The method as in claim 6 including heating the mixture of turmeric root and soap solution to a temperature of about 90° C.
Claim 14
Dependent Claim
82 words
The method as in claim 6 including the additional steps for using said separated liquid to produce a form of curcumin coloring agent that is soluble in fatty based food products, said additional steps comprising: adding sufficient acid to said liquid which contains the curcumin to effect precipitation of a material which contains the curcumin and is bright yellow in color, and separating the liquid and material so the material may be used in fatty based food products as a coloring agent.
Claim 15
Dependent Claim
20 words
The method as in claim 12 wherein addition of said acid is terminated when said liquid is still slightly alkaline.
Claim 16
Dependent Claim
12 words
The method as in claim 12 wherein said acid is muriatic acid.
References Cited (Backward Citations)
US306434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |