Patent US4402641A successfully refreshed from Google Patents.
US3974034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malto-dextrins of improved stability prepared by enzymatic hydrolysis of oxidized starch
Assignee: VARIED INVESTMENTS Inc
•
Filing: 1975-09-12
•
Granted: 1976-08-10
•
Expires: 1995-09-12
Abstract
Abstract There is disclosed malto-dextrins having a D.E. not substantially above about 20, prepared by the enzymatic hydrolysis of oxidized starch. Syrups of the malto-dextrins are capable of remaining haze-free for long periods of time at high solids concentrations. The malto-dextrins are prepared by first liquefying and oxidizing starch at elevated temperatures to provide an oxidized and liquefied starch substantially free of residual starch granules, and in a subsequent step, converting the oxidized and liquefied starch with a bacterial alpha-amylase enzyme preparation to achieve a malto-dextrin product having a D.E. not substantially above about 20.
Inventors
- 👤 Harold E. Horn
- 👤 Bruce A. Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:53
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/18; C08B30/00; C08B30/12; C08B30/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A process for the preparation of an oxidized malto-dextrin, comprising treating in a first step an aqueous slurry of starch with an oxidizing agent at a temperature of at least about 100°C to simultaneously oxidize and liquefy the starch to provide a oxidized and liquefied starch having a D.S. (carboxyl value) within the range of from about 0.2 to about 1.5 said slurry being substantially free to residual starch granules, and thereafter, in an enzymatic conversion step, treating the oxidized and liquefied starch with an alpha-amylase enzyme preparation to produce an oxidized starch hydrolysate having a D.E. not substantially above about 20.
Claim 2
Dependent Claim
102 words
A process for the preparation of an oxidized malto-dextrin, comprising treating in a first step an aqueous slurry of starch with an oxidizing agent at a temperature of at least about 100°C to simultaneously oxidize and liquefy the starch to provide a oxidized and liquefied starch having a D.S. (carboxyl value) within the range of from about 0.2 to about 1.5 said slurry being substantially free to residual starch granules, and thereafter, in an enzymatic conversion step, treating the oxidized and liquefied starch with an alpha-amylase enzyme preparation to produce an oxidized starch hydrolysate having a D.E. not substantially above about 20.
Claim 3
Dependent Claim
24 words
A process as defined in claim 1 wherein the starch slurry is pretreated with an oxidizing agent prior to the simultaneous oxidation and liquefaction.
Claim 4
Dependent Claim
27 words
A process as defined in claim 1 wherein the simultaneous oxidation and liquefaction is conducted at a temperature in the range from about 120° to about 175°C.
Claim 5
Dependent Claim
14 words
A process as defined in claim 1 wherein said oxidizing agent is sodium hypochlorite.
Claim 6
Dependent Claim
25 words
A process as defined in claim 1 wherein the pH during the oxidation and liquefaction step is in the range from about 5 to 8.
Claim 7
Dependent Claim
38 words
A process as defined in claim 1 wherein the temperature of the enzymatic conversion step is in the range from about 60° to about 85°C. and the pH is in the range from about 5 to about 9.
Claim 8
Dependent Claim
14 words
A process as defined in claim 1 wherein the starch is a waxy starch.
Claim 9
Dependent Claim
14 words
A process as defined in claim 1 wherein the starch is a nonwaxy starch.
Claim 10
Dependent Claim
33 words
A process as defined in claim 1 which includes the step of concentrating the oxidized malto-dextrin produced to form a haze-free syrup having a solids content greater than 70%, by weight, dry basis.
References Cited (Backward Citations)
US2916405A
Cited
US3354046A
Cited
US3663369A
Cited
US3539366A
Cited
US3634395A
Cited
US3616219A
Cited
US3709788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |