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US4521252A
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Process for producing a high-purity isomaltose
Assignee: Hayashibara Seibutsu Kagaku Kenkyujo KK
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Filing: 1982-09-21
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Granted: 1985-06-04
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Expires: 2002-09-21
Abstract
Abstract The present invention relates to a process for producing a high-purity isomaltose by applying an aqueous solution, containing isomaltose, to a column packed with a strongly-acidic cation exchange resin of alkali metal- or alkaline earth metal-form; and fractionating by charging water to obtain a high-isomaltose fraction with an isomaltose content of at least 40%, thereby enabling industrial-scale production of a high-purity isomaltose much easier at lower cost.
Inventors
- 👤 Toshio Miyake
- 👤 Shuzo Sakai
- 👤 Takashi Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:31
CPC Classifications
C; C07; C07H; C07H3/00; C07H3/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
202 words
A process for the separation of isomaltose from a feed solution by the utilization of an ion exchange resin, comprising: (a) providing a feed solution containing at least 7% isomaltose based on the weight of the dry solid, the remainder consisting essentially of glucose and isomaltodextrins; (b) sequentially admitting predetermined volumes of the feed solution and water to a column of a strongly acidic cation exchange resin having sulphonyl groups of an alkali metal or alkaline earth metal form; (c) sequentially separating the effluents from the column into the following fractions: a first fraction rich in isomaltodextrins, a second fraction rich in isomaltodextrins, but highly contaminated with isomaltose, a third fraction rich in isomaltose, a fourth fraction rich in isomaltose, but highly contaminated with glucose, and a fifth fraction rich in glucose; (d) recovering the third fraction rich in isomaltose; (e) sequentially admitting into the column: the second fraction obtained in the step (c), a feed solution having an isomaltose content of at least 7% based on the weight dry solid, and the remainder consisting essentially of glucose and isomaltodextrins; the fourth fraction obtained in the step (c) and water; and (f) repeating steps (c), (d) and (e) in a cyclic manner.
Claim 2
Dependent Claim
202 words
A process for the separation of isomaltose from a feed solution by the utilization of an ion exchange resin, comprising: (a) providing a feed solution containing at least 7% isomaltose based on the weight of the dry solid, the remainder consisting essentially of glucose and isomaltodextrins; (b) sequentially admitting predetermined volumes of the feed solution and water to a column of a strongly acidic cation exchange resin having sulphonyl groups of an alkali metal or alkaline earth metal form; (c) sequentially separating the effluents from the column into the following fractions: a first fraction rich in isomaltodextrins, a second fraction rich in isomaltodextrins, but highly contaminated with isomaltose, a third fraction rich in isomaltose, a fourth fraction rich in isomaltose, but highly contaminated with glucose, and a fifth fraction rich in glucose; (d) recovering the third fraction rich in isomaltose; (e) sequentially admitting into the column: the second fraction obtained in the step (c), a feed solution having an isomaltose content of at least 7% based on the weight dry solid, and the remainder consisting essentially of glucose and isomaltodextrins; the fourth fraction obtained in the step (c) and water; and (f) repeating steps (c), (d) and (e) in a cyclic manner.
Claim 3
Dependent Claim
27 words
A process in accordance with claim 1, wherein the isomaltose content in the third fraction is 40% or higher, based on the weight of the dry solid.
Claim 4
Dependent Claim
19 words
A process in accordance with claim 1, wherein the bed depth of the column is at least 7 m.
Claim 5
Dependent Claim
21 words
A process in accordance with claim 1, wherein the temperature of the column of the resin is kept at 45°-85° C.
Claim 6
Dependent Claim
29 words
A process in accordance with claim 1, wherein the cation exchange resin is in the form of Na + , K + , Ca 2+ or Mg 2+ .
Claim 7
Dependent Claim
28 words
A process in accordance with claim 1, wherein the concentration of the feed solution is in the range of 10-70 w/w % on the basis of dry solid.
Claim 8
Dependent Claim
22 words
A process in accordance with claim 1, wherein the water is admitted to the column at a flow rate of SV 0.1-2.0.
Claim 9
Dependent Claim
24 words
A process in accordance with claim 1, wherein the nominal particle size of the cation exchange resin is in the range of 0.01-0.5 mm.
Claim 10
Dependent Claim
72 words
A process in accordance with claim 1, wherein the feed solution is an aqueous solution of a reversible-reaction product containing at least 7% isomaltose on the weight of the dry solid, which has been obtained by: providing a 40-80 w/w % aqueous solution of a member selected from the group consisting of glucose, maltose, maltodextrin, corn syrup, dextrin and mixtures thereof; and exposing the aqueous solution to an effective amount of glucoamylase.
Claim 11
Dependent Claim
68 words
A process in accordance with claim 1, wherein the feed solution is an aqueous solution of a glucose-transferred product containing at least 7% isomaltose on the weight of the dry solid, which has been obtained by: providing an aqueous solution of a member selected from the group consisting of maltose, maltodextrin, corn syrup, dextrin and mixture thereof; and exposing the aqueous solution to an effective amount of α-glucosidase.
Claim 12
Dependent Claim
48 words
A process in accordance with claim 1, wherein the feed solution is an aqueous solution of a partial dextran hydrolysate, which has been obtained by: providing an aqueous solution of dextran; exposing the aqueous solution to an effective amount of an acid catalyst; and neutralizing the reaction mixture.
Claim 13
Dependent Claim
44 words
A process in accordance with claim 1, wherein the feed solution is an aqueous solution of a partial dextran hydrolyzate, which has been obtained by: providing an aqueous solution of dextran; and exposing the aqueous solution to an effective amount of dextranase or isomaltodextranase.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |