US3879370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fish product prepared by decolorizing fish with alkaline hydroperoxide and then deodorizing by isopropanol extraction
Assignee: Astra Nutrition AB
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Filing: 1972-11-02
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Granted: 1975-04-22
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Expires: 1992-11-02
Abstract
Abstract Protein is isolated from raw fish by decolorising it under mild conditions using, for example, hydrogen peroxide and by deodorising it by extraction with isopropanol. The protein isolate so obtained can then be dried to an essentially white powder of high nutritional value.
Inventors
- 👤 Roland Paul Carpenter
- 👤 George Main
- 👤 Anthony Hubert Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
A; A23; A23J; A23J1/00; A23J1/04; A23L; A23L5/00; A23L5/20; A23L5/23; Y; Y10; Y10S; Y10S530/00; Y10S530/855; Y10S530/857
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
THE PROCESS FOR ISOLATING PROTEIN FROM FISH, WHICH COMPRISES THE STEPS OF: I. REMOVING BONE FROM RAW FISH BY A MECHANICAL OPERATION TO PROVIDE A SUBSTANTIALLY BONE-FREE RAW FISH HAVING A PROTEIN EFFICIENCY RATIO EQUIVALENT TO THAT OF THE RAW FISH STARTING MATERIAL, II. THEREAFTER DECOLORIZING THE BONE-FREE RAW FISH AT A PH VALUE OF FROM MILDLY ALKALINE TO ABOUT 9.5 BY MIXING IT WITH AN ALKALI AND WITH HYDROGEN PEROXIDE AT A TEMPERATURE OF FROM ABOUT 40* TO ABOUT 60*C. III. THEREAFTER DEODORIZING THE DECOLORIZED BONE-FREE FISH BY EXTRACTION WITH ISOPROPANOL TO PROVIDE A BONE-FREE ESSENTIALLY WHITE FISH PROTEIN ISOLATE, AND IV. SUBSEQUENTLY DRYING THE ISOLATE.
Claim 2
Dependent Claim
107 words
THE PROCESS FOR ISOLATING PROTEIN FROM FISH, WHICH COMPRISES THE STEPS OF: I. REMOVING BONE FROM RAW FISH BY A MECHANICAL OPERATION TO PROVIDE A SUBSTANTIALLY BONE-FREE RAW FISH HAVING A PROTEIN EFFICIENCY RATIO EQUIVALENT TO THAT OF THE RAW FISH STARTING MATERIAL, II. THEREAFTER DECOLORIZING THE BONE-FREE RAW FISH AT A PH VALUE OF FROM MILDLY ALKALINE TO ABOUT 9.5 BY MIXING IT WITH AN ALKALI AND WITH HYDROGEN PEROXIDE AT A TEMPERATURE OF FROM ABOUT 40* TO ABOUT 60*C. III. THEREAFTER DEODORIZING THE DECOLORIZED BONE-FREE FISH BY EXTRACTION WITH ISOPROPANOL TO PROVIDE A BONE-FREE ESSENTIALLY WHITE FISH PROTEIN ISOLATE, AND IV. SUBSEQUENTLY DRYING THE ISOLATE.
Claim 3
Dependent Claim
107 words
The process for isolating protein from fish, which comprises the steps of: i. removing bone from raw fish by a mechanical operation to provide a substantially bone-free raw fish having a protein efficiency ratio equivalent to that of the raw fish starting material, ii. thereafter decolorizing the bone-free raw fish at a pH value of from mildly alkaline to about 9.5 by mixing it with an alkali and with hydrogen peroxide at a temperature of from about 40* to about 60*C. iii. thereafter deodorizing the decolorized bone-free fish by extraction with isopropanol to provide a bone-free essentially white fish protein isolate, and iv. subsequently drying the isolate.
Claim 4
Dependent Claim
107 words
The process for isolating protein from fish, which comprises the steps of: i. removing bone from raw fish by a mechanical operation to provide a substantially bone-free raw fish having a protein efficiency ratio equivalent to that of the raw fish starting material, ii. thereafter decolorizing the bone-free raw fish at a pH value of from mildly alkaline to about 9.5 by mixing it with an alkali and with hydrogen peroxide at a temperature of from about 40* to about 60*C. iii. thereafter deodorizing the decolorized bone-free fish by extraction with isopropanol to provide a bone-free essentially white fish protein isolate, and iv. subsequently drying the isolate.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein said substantially bone-free raw fish contains less than one percent bone.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the decolorising of the protein is carried out at a pH between about 8.5 and about 9.5.
Claim 7
Dependent Claim
22 words
The process of claim 1, additionally comprising the step of removing excess decolorising agent from the decolorised fish by treatment with catalase.
Claim 8
Dependent Claim
34 words
The process of claim 1, additionally comprising the step of removing excess decolorising agent from the decolorised fish by treatment with a reducing agent selected from the group consisting of ascorbate, sulphite, and hypochlorite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |