US4921796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immobilized cyclodextrin glucosyltransferase composition for the production of cyclodextrins
Assignee: Genetics Institute LLC
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Filing: 1988-04-19
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Granted: 1990-05-01
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Expires: 2008-04-19
Abstract
Abstract This invention relates to a method for the production of a composition comprising the enzyme cyclodextrin glucosyltransferase bound by covalent means to a support material in the presence of a source of divalent calcium ion, said immobilized cyclodextrin glucosyltransferase having a higher activity and greater stability than heretofore reported. This invention further relates to the use of the immobilized cyclodextrin glucosyltransferase for the production of cyclodextrins.
Inventors
- 👤 J. David Rozzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:01
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/10; C12N9/1048; C12N9/1051; C12N9/1074; C12P; C12P19/00; C12P19/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A method for the production of cyclodextrins which comprises contacting (a) an immobilized cyclodextrin glucosyltransferase composition prepared by contacting a solution containing an enzyme having cyclodextrin glucosyltransferase (CGTase) activity with a support bearing pendant aldehyde groups in the presence of a source of divalent calcium ion at a concentration of at least 1 mM under conditions such that at least a portion of the enzyme is bound covalently to the support with (b) a solution containing starch, amylose, glycogen, degraded or partially degraded starch or starch derivatives, or maltodextrins.
Claim 2
Independent Claim
89 words
A method for the production of cyclodextrins which comprises contacting (a) an immobilized cyclodextrin glucosyltransferase composition prepared by contacting a solution containing an enzyme having cyclodextrin glucosyltransferase (CGTase) activity with a support bearing pendant aldehyde groups in the presence of a source of divalent calcium ion at a concentration of at least 1 mM under conditions such that at least a portion of the enzyme is bound covalently to the support with (b) a solution containing starch, amylose, glycogen, degraded or partially degraded starch or starch derivatives, or maltodextrins.
References Cited (Backward Citations)
US3988206A
Cited
US4317881A
Cited
US4384898A
Cited
US4418144A
Cited
US4477568A
Cited
US4593004A
Cited
US4835105A
Cited
US4746734A
Cited
US4781977A
Cited
US4859590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |