Patent US3990945A successfully refreshed from Google Patents.
US3990945A
Expired / Lapsed
US
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Enzymatic hydrolysis of cellulose
Assignee: Bio Research Center Co Ltd
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Filing: 1975-09-18
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Granted: 1976-11-09
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Expires: 1995-09-18
Abstract
Abstract In the enzymatic hydrolysis of cellulose to obtain water-soluble sugars, the enzyme source is the aqueous culture mass obtained in an enzyme preparation step by cultivating in an aqueous nutrient medium in the presence of a cellulosic material a cellulolytic microorganism capable of elaborating a cellulolytic enzyme complex which can degrade native cellulose. No separation is made of any component of the culture mass. Such use of the culture mass as the enzyme source not only eliminates processing steps to separate the enzyme, but also results in increased hydrolysis rates and yields of the desired water-soluble sugars in the hydrolysis of cellulose.
Inventors
- 👤 George F. Huff
- 👤 Naoki Yata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:00
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/24; C12N9/2402; C12N9/2405; C12N9/2434; C12P; C12P19/00; C12P19/14; C13; C13K; C13K1/00; C13K1/02; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/945
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
In a process for the enzymatic hydrolysis of cellulose to obtain water-soluble sugars, wherein a. an extracellular cellulolytic enzyme complex capable of degrading native celulose is prepared in an enzyme prparation step by cultivating in an aqueous nutrient medium in the presence of a cellulosic material a cellulolytic microorganism capable of elaborating said enzyme complex to obtain an aqueous culture mass, and b. a cellulosic substrate is thereafter hydrolyzed in the presence of said enzyme complex under enzymatic hydrolysis conditions to obtain said sugars; the improvement which comprises: performing said enzyme preparation step and said hydrolysis step separately and utilizing in said hydrolysis step the aqueous culture mass of said enzyme preparation step or an aliquot thereof without separating any component thereof, thereby increasing the hydrolysis rate and the yield of water-soluble sugars in said hydrolysis step, and obtaining said sugars from said process.
Claim 2
Dependent Claim
144 words
In a process for the enzymatic hydrolysis of cellulose to obtain water-soluble sugars, wherein a. an extracellular cellulolytic enzyme complex capable of degrading native celulose is prepared in an enzyme prparation step by cultivating in an aqueous nutrient medium in the presence of a cellulosic material a cellulolytic microorganism capable of elaborating said enzyme complex to obtain an aqueous culture mass, and b. a cellulosic substrate is thereafter hydrolyzed in the presence of said enzyme complex under enzymatic hydrolysis conditions to obtain said sugars; the improvement which comprises: performing said enzyme preparation step and said hydrolysis step separately and utilizing in said hydrolysis step the aqueous culture mass of said enzyme preparation step or an aliquot thereof without separating any component thereof, thereby increasing the hydrolysis rate and the yield of water-soluble sugars in said hydrolysis step, and obtaining said sugars from said process.
Claim 3
Dependent Claim
12 words
The process of claim 1, wherein the cellulolytic microorganism is Trichoderma viride.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein the cellulosic material of the enzyme preparation step and the cellulosic substrate of the hydrolysis step are derived from waste cellulose.
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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |