US3663369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolysis of starch
Assignee: Grain Processing Corp
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Filing: 1968-02-23
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Granted: 1972-05-16
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Expires: 1988-02-23
Abstract
Abstract Low conversion starch hydrolyzate products having dextrose equivalent values not substantially above 18 and characterized by a unique saccharide composition, good clarity and little tendency of retrogradation in solution. Methods for preparing low conversion starch hydrolyzates by a two-stage hydrolysis; hydrolysis in the first stage being carried out with acids or enzymes at elevated temperatures for short periods to achieve liquefaction of the starch with very little dextrinization or saccharification and the second stage of the hydrolysis being carried out at an alkaline pH with bacterial alpha-amylase to achieve a desired dextrose equivalent value.
Inventors
- 👤 Alpha L Morehouse
- 👤 Ronald C Malzahn
- 👤 John T Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:43
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A process in accordance with claim 1 wherein dextrinization is carried out using a bacterial alpha-amylase at a temperature from about 65* to 85* C. and a pH of from 7 to 9.
Claim 2
Dependent Claim
34 words
A process in accordance with claim 1 wherein dextrinization is carried out using a bacterial alpha-amylase at a temperature from about 74* to 80* C. and at a pH from about 7.5 to 8.5.
Claim 3
Dependent Claim
29 words
A process in accordance with claim 1 wherein dextrinization is carried out under conditions to produce a hydrolyzate product having a dextrose equivalent value from about 8 to 18.
Claim 4
Dependent Claim
91 words
A process for producing a starch hydrolyzate which comprises treating an aqueous slurry of starch with an acid or enzyme at a temperature above 90* C. to liquefy the starch and to provide an aqueous dispersion substantially free of residual starch granules with a measurable dextrose equivalent value not substantially above 3, then treating the said dispersion with a dextrinizing enzyme at a temperature below 85* C. to achieve a hydrolyzate product having a dextrose equivalent value not substantially above 18, stopping the dextrinization reaction and recovering the hydrolyzate so produced.
Claim 5
Dependent Claim
29 words
A process in accordance with claim 5 wherein liquefaction is carried out using alpha-amylase at a temperature above 90* and at a pH of from about 6 to 8.
Claim 6
Dependent Claim
33 words
A process in accordance with claim 5 wherein liquefaction is carried out using alpha-amylase at a temperature from about 92* to 95* C. and at a pH of from about 6.5 to 7.5.
Claim 7
Dependent Claim
24 words
A process in accordance with claim 5 wherein liquefaction is carried out using an acid at a temperature from about 100* to 160* C.
Claim 8
Dependent Claim
105 words
A starch hydrolyzate having a dextrose equivalent value between 8 and 18 and a saccharide composition wherein the amount of glucose present is less than 1 percent by weight and the amount of maltose is less than 6 percent by weight, said hydrolyzate being further characterized as producing a fluid solution free of opacity (transmittance of light rays through the solution maintained at 10* C. over a period of 48 hours is at least 70percent) when the hydrolyzate is added to water at solids concentrations specified below: Dextrose equivalent of Hydrolyzate Solids Concentration 8 10 10 20 12 35 14 50 16 65 18 80
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |