US3974033A
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Malto-dextrins of improved stability prepared by enzymatic hydrolysis of oxidized starch
Assignee: VARIED INVESTMENTS Inc
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Filing: 1975-09-12
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Granted: 1976-08-10
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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 a highly oxidized starch with an acid or an enzyme to a D.E. not substantially above about 7, 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
- 👤 Clarence F. Harjes
- 👤 Vilas L. Wermers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:53
CPC Classifications
C; C08; C08B; C08B30/00; C08B30/12; C08B30/18; C13; C13K; C13K1/00; C13K1/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
98 words
A process for the preparation of an oxidized maltodextrin comprising treating in a first step an aqueous slurry of oxidized starch having a minimum D.S. (carboxyl) value within the range of about 0.2 to about 1.5 with an acid or an enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above about 7 and to provide a liquefied hydrolysate substantially free of residual oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 2
Dependent Claim
98 words
A process for the preparation of an oxidized maltodextrin comprising treating in a first step an aqueous slurry of oxidized starch having a minimum D.S. (carboxyl) value within the range of about 0.2 to about 1.5 with an acid or an enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above about 7 and to provide a liquefied hydrolysate substantially free of residual oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 3
Dependent Claim
24 words
A process as defined in claim 1 wherein the oxidized starch is treated in the first step with an acid to liquefy the starch.
Claim 4
Dependent Claim
21 words
A process as defined in claim 1 wherein the oxidized starch is treated in the first step with a liquefying enzyme.
Claim 5
Dependent Claim
18 words
A process as defined in claim 2 wherein the liquefaction is carried out at a pH below 5.
Claim 6
Dependent Claim
23 words
A process as defined in claim 2 wherein the liquefaction is carried out at a temperature within the range of 60° to 100°C.
Claim 7
Dependent Claim
14 words
A process as defined in claim 3 wherein the enzyme is a bacterial alpha-amylase.
Claim 8
Dependent Claim
18 words
A process as defined in claim 3 wherein the liquefaction is carried out at a temperature above 80°C.
Claim 9
Dependent Claim
33 words
A process as defined in claim 3 wherein the liquefaction is carried out at a temperature within the range of 80° to 105°C. and a pH of from about 5.0 to about 9.0.
Claim 10
Dependent Claim
17 words
A process as defined in claim 1 wherein the saccharifying enzyme is derived from a bacterial alpha-amylase.
Claim 11
Dependent Claim
32 words
A process as defined in claim 1 wherein the oxidized starch is treated with the saccharifying enzyme to produce a hydrolysate having a final D.E. within the range of 8 to 20.
Claim 12
Dependent Claim
18 words
A process as defined in claim 1 wherein the temperature in the enzyme conversion step is below 85°C.
Claim 13
Dependent Claim
30 words
A process as defined in claim 11 wherein the temperature in the enzymatic conversion step is at least 60°C, and the pH is within the range of 6.0 to 8.0.
Claim 14
Dependent Claim
31 words
A process as defined in claim 1 which includes the step of concentrating the hydrolysate produced to form a syrup which has a solids content of greater than 50% by weight.
Claim 15
Dependent Claim
40 words
A process as defined in claim 3 which includes the step of heating the liquefied hydrolysate produced in the first step to a temperature in the range of from about 95° to about 180°C. to further liquefy the oxidized starch.
Claim 16
Dependent Claim
94 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a minimum carboxyl value within the range of about 0.2 to about 1.5 with an acid to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 17
Dependent Claim
94 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a minimum carboxyl value within the range of about 0.2 to about 1.5 with an acid to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 18
Dependent Claim
95 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a minimum carboxyl value within the range of about 0.2 to about 1.5 with a liquefying enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 19
Dependent Claim
95 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a minimum carboxyl value within the range of about 0.2 to about 1.5 with a liquefying enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of oxidized starch granules and thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20.
Claim 20
Dependent Claim
127 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a solids content less than about 50% by weight and having a minimum carboxyl value within the range of about 0.2 to about 1.5 with an acid or an enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of residual oxidized starch granules, thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20, and concentrating the resulting starch hydrolysate to a solids content greater than 50% by weight to obtain a syrup.
Claim 21
Dependent Claim
127 words
A process for the preparation of haze-free hydrolysates from oxidized starch comprising treating in a first step an aqueous slurry of oxidized starch having a solids content less than about 50% by weight and having a minimum carboxyl value within the range of about 0.2 to about 1.5 with an acid or an enzyme to liquefy and hydrolyze the oxidized starch to a D.E. not substantially above 7 and to provide a liquefied hydrolysate substantially free of residual oxidized starch granules, thereafter in an enzymatic conversion step, treating the liquefied hydrolysate with a saccharifying enzyme to produce an oxidized starch hydrolysate having a D.E. not substantially above 20, and concentrating the resulting starch hydrolysate to a solids content greater than 50% by weight to obtain a syrup.
References Cited (Backward Citations)
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 |