Patent US2616828A successfully refreshed from Google Patents.
US2616828A
Expired / Lapsed
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Method of enzymatic resolution of amino acids
Assignee: Individual
•
Filing: 1951-04-30
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Granted: 1952-11-04
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Expires: 1971-04-30
Abstract
No abstract record available.
Inventors
- 👤 Levintow Leon
- 👤 Jesse P Greenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:13
CPC Classifications
C; C12; C12P; C12P41/00; C12P41/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS FOR RESOLVING A RACEMIC AMINO ACID SELECTED FROM THE GROUP CONSISTING OF DLHISTIDINE AND S-BENZYL-DL-CYSTEINE WHICH COMPRISES FIRST FORMING THE AMIDE OF SUCH A RACEMIC ACID, THEN INCUBATING AN AQUEOUS SOLUTION OF SUCH AMIDE AT ABOUT 37* C. AND A PH BETWEEN ABOUT 9.0 AND 9.5 IN THE PRESENCE OF MANGANESE IONS THE HOND KIDNEY ENZYME SELECTIVELY TO HYDROLYZE THE LEVO ACID AMIDE WHILE NOT SUBSTANTIALLY AFFECTING THE DEXTO ACID AMIDE, AND REMOVING AND SEPARATING THE FREE LEVO ACID FROM THE UNCHANGED DESTRO ACID AMIDE SOLUTION.
Claim 2
Dependent Claim
88 words
A PROCESS FOR RESOLVING A RACEMIC AMINO ACID SELECTED FROM THE GROUP CONSISTING OF DLHISTIDINE AND S-BENZYL-DL-CYSTEINE WHICH COMPRISES FIRST FORMING THE AMIDE OF SUCH A RACEMIC ACID, THEN INCUBATING AN AQUEOUS SOLUTION OF SUCH AMIDE AT ABOUT 37* C. AND A PH BETWEEN ABOUT 9.0 AND 9.5 IN THE PRESENCE OF MANGANESE IONS THE HOND KIDNEY ENZYME SELECTIVELY TO HYDROLYZE THE LEVO ACID AMIDE WHILE NOT SUBSTANTIALLY AFFECTING THE DEXTO ACID AMIDE, AND REMOVING AND SEPARATING THE FREE LEVO ACID FROM THE UNCHANGED DESTRO ACID AMIDE SOLUTION.
References Cited (Backward Citations)
US2511867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |