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US4259477A
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Process for making cellulase-free xanthan gum
Assignee: Merck and Co Inc
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Filing: 1979-06-04
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Granted: 1981-03-31
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Expires: 1999-06-04
Abstract
Abstract Cellulase in xanthan gum can be completely destroyed by treating xanthan gum beer with about 0.08 to 0.1% alkali metal hypochlorite followed by heat treatment.
Inventors
- 👤 Kenneth S. Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:23
CPC Classifications
C; C08; C08B; C08B37/00; C12; C12N; C12N9/00; C12N9/99; A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/73; A61Q; A61Q11/00; C12P; C12P19/00; C12P19/04; C12P19/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A process for producing cellulase-free xanthan gum which comprises: a. reacting xanthan gum beer at a pH of about 6.0 to about 7.0 with an alkali metal hypochlorite, and b. heating the product of step a at 85°-95° C. for 2-10 minutes.
Claim 2
Dependent Claim
42 words
A process for producing cellulase-free xanthan gum which comprises: a. reacting xanthan gum beer at a pH of about 6.0 to about 7.0 with an alkali metal hypochlorite, and b. heating the product of step a at 85°-95° C. for 2-10 minutes.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the hypochlorite level of the product of step a is below 0.03%.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the hypochlorite level of the product of step a is below 0.02%.
Claim 5
Dependent Claim
55 words
A process for producing cellulase-free xanthan gum which comprises: a. reacting xanthan gum beer at pH 6.0 to 7.0 with 0.08-0.1 weight % sodium hypochlorite for 6-8 at about 30° C., and b. when the hypochlorite level of the product of step a is below 0.02% heating said product at 85°-95° C. for 2-10 minutes.
Claim 6
Dependent Claim
55 words
A process for producing cellulase-free xanthan gum which comprises: a. reacting xanthan gum beer at pH 6.0 to 7.0 with 0.08-0.1 weight % sodium hypochlorite for 6-8 at about 30° C., and b. when the hypochlorite level of the product of step a is below 0.02% heating said product at 85°-95° C. for 2-10 minutes.
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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |