US4416990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic clarification process for improving the injectivity and filtrabhility of xanthan gums
Assignee: IFP Energies nouvelles
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Filing: 1981-10-06
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Granted: 1983-11-22
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Expires: 2001-10-06
Abstract
Abstract Enzymatic treatment, in aqueous dispersion, of a xanthan gum containing bacteria cell residues and microgels, as impurities, by means of Basidiomycete cellulase, the aqueous dispersion having a pH from 3 to 7 and containing at least 0.1 equivalent/liter of at least one salt of alkali or alkaline-earth metal, said treatment being conducted at a temperature from 25 DEG to 65 DEG C., improved the injectivity and filtrability thereof.
Inventors
- 👤 Marguerite Rinaudo
- 👤 Michel Milas
- 👤 Norbert Kohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:03
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/04; C12P19/06; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A process for enzymatically purifying, an impure xanthan gum containing, as impurities, at least one of bacterial cell residues or microgels, which comprises contacting an aqueous dispersion of said impure xanthan gum with a polysaccharase enzyme preparation of Basidiomycetes Polyporaceae cellulose, said aqueous dispersion having a pH from 3 to 7 and a total concentration of alkali and/or alkaline-earth metal salts dissolved therein of at least 10 -1 equivalent/liter; wherein said contacting is effected at a temperature sufficient to allow the removal of said cell residues and microgels without substantially hydrolysing the xanthan gum; whereby the viscosity of said aqueous dispersion is not substantially decreased.
Claim 2
Dependent Claim
105 words
A process for enzymatically purifying, an impure xanthan gum containing, as impurities, at least one of bacterial cell residues or microgels, which comprises contacting an aqueous dispersion of said impure xanthan gum with a polysaccharase enzyme preparation of Basidiomycetes Polyporaceae cellulose, said aqueous dispersion having a pH from 3 to 7 and a total concentration of alkali and/or alkaline-earth metal salts dissolved therein of at least 10 -1 equivalent/liter; wherein said contacting is effected at a temperature sufficient to allow the removal of said cell residues and microgels without substantially hydrolysing the xanthan gum; whereby the viscosity of said aqueous dispersion is not substantially decreased.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein said contacting is effected at a pH from 3 to 6.
Claim 4
Dependent Claim
41 words
A process according to claim 1 wherein the impure xanthan gum dispersion is a fermentation broth of a xanthan gum-producing bacteria, said gum, containing bacterial cell residues, having not been subjected to a treatment for isolating it in a solid state.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein the impure xanthan gum is a xanthan gum in a solid state, containing bacterial cell residues.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the xanthan gum is an inactive xanthan gum.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the enzyme preparation is a Basidiomycetes Poria cellulose preparation.
Claim 8
Dependent Claim
19 words
A process according to claim 1, wherein said contacting is effected at a temperature from 25° to 65° C.
Claim 9
Dependent Claim
14 words
A process according to claim 3 wherein said temperature from 40° to 60° C.
Claim 10
Dependent Claim
34 words
A process according to claim 1, wherein the maximum temperature of said contacting is determined by the empirical formula: T.sup.x =125+43 log μ in the case of monovalent metals, μ being the ionic strength.
Claim 11
Dependent Claim
42 words
A process according to claim 1, wherein the aqueous dispersion of purified xanthan gum is subjected to a subsequent treatment for precipitating the gun, the precipitated gum is separated as a solid and dried, and the dry, solid purified gum is recovered.
Claim 12
Dependent Claim
16 words
A process according to claim 1, wherein the enzyme preparation is a Basidiomycetes Polyporaceae cellulose preparation.
Claim 13
Dependent Claim
16 words
A process according to claim 11, wherein the enzyme preparation is a Basiodiomycetes Polyporus cellulose preparation.
Claim 14
Dependent Claim
16 words
A process according to claim 11, wherein the enzyme preparation is a Basidiomycetes Trametes cellulose preparation.
Claim 15
Dependent Claim
25 words
A process according to claim 11, wherein the enzyme preparation is a Basidiomycetes cellulase preparation from the genus Collybia, Lentinus, Pleurotus, Schizophyllum, Fistulina or Fomes.
References Cited (Backward Citations)
US4032663A
Cited
US4010071A
Cited
US4094739A
Cited
US4119491A
Cited
US4326037A
Cited
GB2065688B
Cited
US4299825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |