US4303787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering cyclodextrins
Assignee: Nihon Shokuhin Kako Co Ltd
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Filing: 1980-05-23
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Granted: 1981-12-01
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Expires: 2000-05-23
Abstract
Abstract The present invention relates to a novel process for recovering cyclodextrins, characterized in that a solution containing cyclodextrins as well as starches, dextrins, reducing sugars and the like is brought into contact with a hydrophobic, synthetic adsorption resin comprising a porous polymer to adsorb only cyclodextrins, the cyclodextrins thus adsorbed being eluted thereafter with water while being heated to separate and recover said cyclodextrins.
Inventors
- 👤 Koki Horikoshi
- 👤 Mikio Yamamoto
- 👤 Nobuyuki Nakamura
- 👤 Masanobu Kawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:54
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/18; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0012
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A process for recovering cyclodextrins wherein a solution containing cyclodextrins as well as starches, dextrins, reducing sugars is brought into contact with a hydrophobic, synthetic adsorption resin comprising a porous polymer to absorb only cyclodextrins, said polymer having no functional radical and having pores into which liquid water cannot enter, after which said adsorbed cyclodextrins are eluted.
Claim 2
Dependent Claim
57 words
A process for recovering cyclodextrins wherein a solution containing cyclodextrins as well as starches, dextrins, reducing sugars is brought into contact with a hydrophobic, synthetic adsorption resin comprising a porous polymer to absorb only cyclodextrins, said polymer having no functional radical and having pores into which liquid water cannot enter, after which said adsorbed cyclodextrins are eluted.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein said synthetic adsorption resin comprises a porous styrene-divinylbenzene copolymer having a specific surface of greater than 100 m 2 /g.
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein said elution step is carried out with water while heating.
Claim 5
Dependent Claim
25 words
A process according to claim 3 wherein said elution step is carried out with water while heating to obtain each of the cyclodextrins contained therein.
Claim 6
Dependent Claim
81 words
A process according to claim 1 wherein said solution is any one of the following: a solution containing starch hydrolyzates obtained by reaction some gelatinized or liquefied starches with cyclodextrin glycosyltransferase, a filtrate obtained by filtering said hydrolyzates to remove β-cyclodextrin, or, a solution containing saccharified products comprising cyclodextrins and reducing sugars, said products are obtained by reacting said hydrolyzates or said filtrate with a saccharified enzyme incapable or hardly capable of hydrolyzing cyclodextrins thereby to hydrolyze acyclic dextrins mixture therein.
Claim 7
Dependent Claim
23 words
A process according to claim 5 wherein said filtrate is obtained from starch hydrolyzates by crystallizing β-cyclodextrin therein without using any organic solvents.
Claim 8
Dependent Claim
61 words
A process according to claim 5 wherein said solution containing starch hydrolyzates and said filtrate are a solution containing saccharified products comprising mainly α-cyclodextrin and reducing sugars, said products are obtained by reacting said hydrolyzates or said filtrate with a sacchrified enzyme incapable or hardly capable of hydrolyzing α-cyclodextrin thereby the hydrolyze cyclodextrins other than α-cyclodextrin and acylic dextrins mixture therein.
Claim 9
Dependent Claim
23 words
The process according to claim 1, wherein said polymer has less than 1000 m 2 /g specific surface and the porosity is 40-90%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |