US4312949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of a gamma globulin solution suitable for intravenous use
Assignee: AHRENS ULRICH E
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Filing: 1981-02-02
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Granted: 1982-01-26
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Expires: 2001-02-02
Abstract
Abstract A gamma globulin solution suitable for intravenous use is prepared by treating the gamma globulin fraction of plasma or serum obtained in known manner with a peptic enzyme at a pH value of about 4. The treatment is carried out with at most 20,000 A.E./100 g. protein at a temperature of about from 37°-40° C.
Inventors
- 👤 Ulrich E. Ahrens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:15
CPC Classifications
C; C07; C07K; C07K16/00; C07K16/06; C07K16/065; A; A61; A61K; A61K38/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A method of producing a gamma globulin solution suitable for intravenous use, comprising the following steps in the following sequence: treating a solution of gamma globulin fraction of plasma or serus with a DEAE cellulose-type ion-exchange substance, subjecting the solution to ultrafiltration to yield a concentrate, treating the concentrate with an activated charcoal-type absorbing substance and separating purified concentrate from the absorbing substance, treating the purified concentrate with a peptic enzyme at a pH value of about 4, treating the solution thus obtained with an activated charcoal-type absorbing substance and separating the absorbing substance from the solution.
Claim 2
Independent Claim
97 words
A method of producing a gamma globulin solution suitable for intravenous use, comprising the following steps in the following sequence: treating a solution of gamma globulin fraction of plasma or serus with a DEAE cellulose-type ion-exchange substance, subjecting the solution to ultrafiltration to yield a concentrate, treating the concentrate with an activated charcoal-type absorbing substance and separating purified concentrate from the absorbing substance, treating the purified concentrate with a peptic enzyme at a pH value of about 4, treating the solution thus obtained with an activated charcoal-type absorbing substance and separating the absorbing substance from the solution.
Claim 3
Dependent Claim
39 words
A method according to claim 1 in which said peptic enzyme is pepsin and the purified concentrate is treated with not more than 20,000 Anson units per 100 g protein at a temperature of from 37° to 40° C.
Claim 4
Dependent Claim
22 words
A method according to claim 1 in which the purified concentrate is treated with peptic enzyme for from 12 to 24 hours.
Claim 5
Dependent Claim
161 words
A method according to claim 1 in which the treatment of the solution of the gamma globulin fraction with an ion exchange substance is carried out using diethylaminoethyl cellulose as the ion exchange substance by phosphate buffering the solution at a pH of about 6.5 and treating the phosphate buffered solution with a first portion of diethylaminoethyl cellulose and filtering to produce a first filtrate, washing the diethylaminoethyl cellulose residue with a phosphate buffer solution at a pH of about 6.5 and filtering to produce a second filtrate, combining said first and second filtrates and treating the combined filtrates with a further portion of diethylamineothyl cellulose and filtering to produce a third filtrate, washing the residue of the further portion of diethylaminoethyl cellulose with a phosphate buffer solution at a pH of about 6.5 and filtering to produce a fourth filtrate, combining said third and fourth filtrates and subjecting said combined third and fourth filtrates to ultrafiltration to yield said concentrate.
Claim 6
Dependent Claim
37 words
A method according to claim 1 in which the absorbing substance used to treat said concentrate is activated charcoal and the pH value of the concentrate is adjusted to about 7 before treatment with said activated charcoal.
Claim 7
Dependent Claim
51 words
A method according to claim 1 in which the protein content and isotonicity of the solution obtained after separation of the absorbing substance is adjusted to a protein content of about 5 g/dl and a pH of about 7.0 and the solution is then filtered and put in containers for storage.
Claim 8
Dependent Claim
28 words
A method according to claim 6 in which the pH value of the solution is adjusted to about 7 before the protein content and isotonicity therefore is adjusted.
References Cited (Backward Citations)
US3966906A
Cited
US3903262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |