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US4226937A
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Method using glucoamylase immobilized on porous alumina
Assignee: Unilever Bestfoods North America
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Filing: 1979-04-27
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Granted: 1980-10-07
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Expires: 1999-04-27
Abstract
Abstract A process for the production of dextrose-containing syrups wherein a deionized starch hydrolyzate is treated with glucoamylase immobilized on porous alumina.
Inventors
- 👤 Mukhtar Abdullah
- 👤 Frederick C. Armbruster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:18
CPC Classifications
C; C12; C12N; C12N11/00; C12N11/14; C12P; C12P19/00; C12P19/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A process for converting a starch hydrolyzate to a dextrose-containing syrup which comprises: a. treating the starch hydrolyzate with ion-exchange resin until its ash content is less than 0.1% on a dry basis; b. contacting the deionized starch hydrolyzate with an immobilized enzyme composite consisting essentially of glucoamylase sorbed on porous alumina; c. separating the treated hydrolyzate from said enzyme composite; and d. recovering the dextrose product from the treated hydrolyzate.
Claim 2
Dependent Claim
71 words
A process for converting a starch hydrolyzate to a dextrose-containing syrup which comprises: a. treating the starch hydrolyzate with ion-exchange resin until its ash content is less than 0.1% on a dry basis; b. contacting the deionized starch hydrolyzate with an immobilized enzyme composite consisting essentially of glucoamylase sorbed on porous alumina; c. separating the treated hydrolyzate from said enzyme composite; and d. recovering the dextrose product from the treated hydrolyzate.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the pH of the starch hydrolyzate is maintained between about 3.5 and 5.5.
Claim 4
Dependent Claim
20 words
The process of claim 1 when the pH of the starch hydrolyzate is maintained preferably between about 4.2 and 4.5.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the starch hydrolyzate has a D.E. of between about 10 and 80.
Claim 6
Dependent Claim
17 words
The process of claim 1 when the glucoamylase has been purified by precipitation with an organic solvent.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the alumina is substantially magnesium free.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the starch hydrolyzate is treated with the enzyme composite at a temperature of from about 50° C. to about 60° C.
References Cited (Backward Citations)
US4011137A
Cited
US4132595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |