US4212799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a proteinic isolate from sunflowerseed meal using aluminum salts
Assignee: SnamProgetti SpA
•
Filing: 1979-05-22
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Granted: 1980-07-15
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Expires: 1999-05-22
Abstract
Abstract A method for preparing nontoxic, edible proteinic concentrates adapted also for human nutrition, is disclosed according to which undesirable compounds such as polyphenols (e.g. chlorogenic and caffeic acids) are complexed by aluminum salts to prevent oxidizing these polyphenols to quinones. It is important that aluminum be constantly kept in soluble form to prevent it from being precipitated together with the proteins when protein-precipitating acidification is carried out. Citric acid has been found to be the best complexing agent.
Inventors
- 👤 Carlo Nuzzolo
- 👤 Rodolfo Vignola
- 👤 Antonio Groggia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:00
CPC Classifications
A; A23; A23J; A23J1/00; A23J1/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A method for the preparation of proteinic isolates from vegetable meals which contain undesirable compounds, comprising the steps of directly extracting the proteins with alkaline aqueous solutions while concurrently complexing such undesirable compounds with an Al salt, and subsequently precipitating the proteins by acidification to the isoelectric point in the presence of a compound capable of maintaining aluminum in solution, redissolving the proteins and precipitating them again still in the presence of the compound capable of maintaining aluminum in solution.
Claim 2
Independent Claim
80 words
A method for the preparation of proteinic isolates from vegetable meals which contain undesirable compounds, comprising the steps of directly extracting the proteins with alkaline aqueous solutions while concurrently complexing such undesirable compounds with an Al salt, and subsequently precipitating the proteins by acidification to the isoelectric point in the presence of a compound capable of maintaining aluminum in solution, redissolving the proteins and precipitating them again still in the presence of the compound capable of maintaining aluminum in solution.
Claim 3
Dependent Claim
26 words
Method for the preparation of proteinic isolates according to claim 1, characterized in that the vegetable meal is sunflowerseed meal and the undesirable compounds are polyphenols.
Claim 4
Dependent Claim
27 words
Method for the preparation of proteinic isolates according to claims 1 or 2, characterized in that the extraction is carried out with a solution of sodium hydroxide.
Claim 5
Dependent Claim
31 words
Method for the preparation of proteinic isolates according to any one of claims 1, 2 or 3, characterized in that the compound capable of maintaining aluminium in solution is citric acid.
Claim 6
Dependent Claim
35 words
Method for the preparation of proteinic isolates according to any one of claims 1, 2, 3, or 4 characterized in that the acidification to pH 5 is obtained by means of the same citric acid.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein the Al salt is AlCl3 or Al2(SO4)3.
Claim 8
Dependent Claim
15 words
A method according to claim 2 wherein the polyphenol is chlorogenic acid or caffeic acid.
References Cited (Backward Citations)
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Cited
US2377853A
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US2549526A
Cited
US2607768A
Cited
US3361574A
Cited
US3459555A
Cited
US4131607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |