US5270446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decolorized crosslinked products and method for decolorization of crosslinked products
Assignee: Suntory Ltd
•
Filing: 1992-05-18
•
Granted: 1993-12-14
•
Expires: 2012-05-18
Abstract
Abstract A crosslinked product of a primary amino group-containing compound such as proteins, chitosan or a mixture thereof is disclosed. The product has a crosslinked structure formed by crosslinking with an iridoid compound, and the blue color developed by the crosslinking is decolorized. Also, a method for decolorization of the above crosslinked product is disclosed. The method comprises reacting a crosslinked product obtained by crosslinking a primary amino group-containing compound with an iridoid compound, with at least one decolorizing agent selected from the group consisting of an oxidizing agent, a reducing agent and a reductone. The decolorized product and the method for decolorization according to the present invention can be broadly applied in the fields of foodstuffs, cosmetics, pharmaceuticals and the like where blue tone coloration is undesirable.
Inventors
- 👤 Nobuo Kyogoku
- 👤 Keiko Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:41
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; C07; C07K; C07K1/00; C07K1/107; C07K1/1072; C07K1/1077; C07K14/00; C07K14/435; C07K14/46; C07K14/47; C07K14/4701; C07K14/4717; C07K14/78; C08H; C08H1/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A crosslinked product decolorized of blue color formed during crosslinking of a primary amino group-containing compound with an iridoid compound; said primary amino group-containing compound being selected from the group consisting of proteins isolated from oil seeds, proteins isolated from soybean, milk protein, egg protein, collagen, gelatin, chitosan and a mixture thereof; and said iridoid compound being a substance selected from the group consisting of genipin, geniposide, gardenoside, geniposidic acid and a mixture thereof.
Claim 2
Dependent Claim
74 words
A crosslinked product decolorized of blue color formed during crosslinking of a primary amino group-containing compound with an iridoid compound; said primary amino group-containing compound being selected from the group consisting of proteins isolated from oil seeds, proteins isolated from soybean, milk protein, egg protein, collagen, gelatin, chitosan and a mixture thereof; and said iridoid compound being a substance selected from the group consisting of genipin, geniposide, gardenoside, geniposidic acid and a mixture thereof.
Claim 3
Dependent Claim
47 words
A crosslinked product of a primary amino group-containing compound as claimed in claim 1, wherein said crosslinked structure is formed by crosslinking with said iridoid compound at a proportion of from 0.001 to 1.0 part by weight per part by weight of the primary amino group-containing compound.
Claim 4
Dependent Claim
20 words
A crosslinked product of a primary amino group-containing compound as claimed in claim 1, wherein said iridoid compound is genipine.
Claim 5
Dependent Claim
42 words
A crosslinked product of a primary amino group-containing compound as claimed in claim 3, wherein said genipine is used for crosslinking at a proportion of from 0.001 to 0.1 part by weight per part by weight of the primary amino group-containing compound.
Claim 6
Independent Claim
116 words
A method for decolorization of a crosslinked product which comprises the steps of: a) contacting a crosslinked product obtained by crosslinking a primary amino group-containing compound with an iridoid compound, with a decolorizing agent, wherein said decolorizing agent is a material selected from the group consisting of an oxidizing agent, a reducing agent and a reductone, and b) recovering a decolorized product, said primary amino group-containing compound being selected from the group consisting of proteins isolated from oil seeds, proteins isolated from soybean, milk protein, egg protein, collagen, gelatin, chitosan and a mixture thereof; and said iridoid compound being a substance selected from the group consisting of genipin, geniposide gardenoside, geniposidic acid and a mixture thereof.
Claim 7
Independent Claim
116 words
A method for decolorization of a crosslinked product which comprises the steps of: a) contacting a crosslinked product obtained by crosslinking a primary amino group-containing compound with an iridoid compound, with a decolorizing agent, wherein said decolorizing agent is a material selected from the group consisting of an oxidizing agent, a reducing agent and a reductone, and b) recovering a decolorized product, said primary amino group-containing compound being selected from the group consisting of proteins isolated from oil seeds, proteins isolated from soybean, milk protein, egg protein, collagen, gelatin, chitosan and a mixture thereof; and said iridoid compound being a substance selected from the group consisting of genipin, geniposide gardenoside, geniposidic acid and a mixture thereof.
Claim 8
Dependent Claim
46 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said crosslinked structure is formed by crosslinking with said iridoid compound at a proportion of from 0.001 to 1.0 part by weight per part by weight of the primary amino group-containing compound.
Claim 9
Dependent Claim
34 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said decolorizing agent is used at a proportion of from 0.01 to 3 parts by weight of the crosslinked product.
Claim 10
Dependent Claim
46 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said oxidizing agent is a material selected from the group consisting of hydrogen peroxide, oxyacids, sodium chlorite, potassium bromate, ammonium persulfate, sodium hypochlorite, bleaching powder, chlorine dioxide, halogen, dehydroascorbic acid, and ozone.
Claim 11
Dependent Claim
35 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said reducing agent is a material selected from the group consisting of hydrosulfite, sodium hydrogen pyrosulfite, sodium sulfite, and potassium pyrosulfite.
Claim 12
Dependent Claim
34 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said reductone is a material selected from the group consisting of ascorbic acid, isoascorbic acid, triosereductone, enaminol, thiolenol, and endiamine.
Claim 13
Dependent Claim
45 words
A method for decolorization of a crosslinked product as claimed in claim 5, wherein said decolorizing agent is a material selected from the group consisting of a mixture of an oxidizing agent and a reductone and a mixture of a reducing agent and a reductone.
References Cited (Backward Citations)
US4247698A
Cited
US4232159A
Cited
US4347356A
Cited
US4401825A
Cited
US4762918A
Cited
US4878921A
Cited
US4983524A
Cited
EP0306651A1
Cited
EP0306650A1
Cited
US5037664A
Cited
US5098733A
Cited
CA2013706A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |