US4164496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of albumin using PEG and EDTA
Assignee: American Red Cross
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Filing: 1978-08-23
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Granted: 1979-08-14
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Expires: 1998-08-23
Abstract
Abstract Methods for the large scale preparation of clinical albumin are disclosed. One method includes dilution of plasma with a NaCl solution containing disodium ethylene dinitrilo tetraacetate and a stabilizer such as sodium caprylate. The resulting solution is then subjected to heating and cooling steps, followed by the addition of polyethylene glycol to precipitate impurities, with albumin remaining in the supernatant. Isoelectric precipitation is then employed to recover the desired albumin product, which is devoid of the albumin dimer. In an alternative method, ethanol is employed as the precipitating agent rather than polyethylene glycol.
Inventors
- 👤 Yu L. Hao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:58
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/435; C07K14/76; C07K14/765; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/829; Y10S530/83
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A method for the preparation of albumin comprising: (a) diluting plasma in liquid form with an equal volume of a NaCl solution containing disodium ethylene dinitrilo tetraacetate and a stabilizer; (b) adjusting the pH of the plasma solution resulting from step (a) to about 6.2; (c) heating the plasma solution from step (b) at a temperature of approximately 60° C. for about 11/2 hours; (d) cooling the plasma solution to about 10° C.; (e) precipitating impurities from the solution with polyethylene glycol at a concentration of about 18-20% with the albumin remaining in the supernatant; (f) isoelectrically precipitating albumin from said supernatant at a pH of about 4.6; and (g) recovering the albumin product.
Claim 2
Independent Claim
114 words
A method for the preparation of albumin comprising: (a) diluting plasma in liquid form with an equal volume of a NaCl solution containing disodium ethylene dinitrilo tetraacetate and a stabilizer; (b) adjusting the pH of the plasma solution resulting from step (a) to about 6.2; (c) heating the plasma solution from step (b) at a temperature of approximately 60° C. for about 11/2 hours; (d) cooling the plasma solution to about 10° C.; (e) precipitating impurities from the solution with polyethylene glycol at a concentration of about 18-20% with the albumin remaining in the supernatant; (f) isoelectrically precipitating albumin from said supernatant at a pH of about 4.6; and (g) recovering the albumin product.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said stabilizer is sodium caprylate.
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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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |