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US4458017A
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Process for preparing fructose from starch
Assignee: Stabra AG
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Filing: 1982-06-30
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Granted: 1984-07-03
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Expires: 2002-06-30
Abstract
Abstract Process for preparing fructose by treating starch with alpha-amylase, contacting the resulting liquefied starch with glucoamylase to hydrolyze said starch to glucose, and isomerizing at least part of the resulting glucose to fructose by contacting said glucose with glucose isomerase. The three enzymes are obtained from an organism of the Basidiomycetes class of fungi.
Inventors
- 👤 Robert O. Horwath
- 👤 Robert M. Irbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:40
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/24; C12N9/2402; C12N9/2405; C12N9/2408; C12N9/2411; C12N9/2414; C12N9/2417; C12N9/242; C12N9/2428; C12N9/90; C12N9/92; C12P; C12P19/00; C12P19/14; C12P19/20; C12P19/24; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
The process for preparing fructose which comprises liquefying starch by contacting starch with alpha-amylase contacting the resulting liquefied starch with glucoamylase to hydrolyze said starch to glucose, and isomerising at least part of the resulting glucose to fructose by contacting said glucose with glucose isomerase, wherein all three enzymes are obtained from the same organism, Irpex mollis, A.T.C.C. No. 20634.
Claim 2
Dependent Claim
60 words
The process for preparing fructose which comprises liquefying starch by contacting starch with alpha-amylase contacting the resulting liquefied starch with glucoamylase to hydrolyze said starch to glucose, and isomerising at least part of the resulting glucose to fructose by contacting said glucose with glucose isomerase, wherein all three enzymes are obtained from the same organism, Irpex mollis, A.T.C.C. No. 20634.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the glucose isomerase activity is present in the mycelia of the said organism.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the glucose isomerase activity is extracted from the mycelia of the said organism.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the glucoamylase and alpha-amylase activities are present in the nutrient medium employed for growth of the said organism.
References Cited (Backward Citations)
US4308349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |