Bilayer pellet containing immobilized xylose isomerase and urease for the simultaneous isomerization and fermentation of xylose to ethanol
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Abstract/Description: | A bilayered immobilized enzyme pellet and a process to manufacture this pellet are provided for use in a process involving the simultaneous isomerization of xylose to xylulose and fermentation of xylulose to ethanol. The bilayered pellet is able to maintain the environment where the isomerization reaction occurs within its optimum pH of 7.0 to 8.0 while the fermentation reaction occurs within its optimum pH range of 4.0 to 5.0. This process allows both xylose and glucose sugars to be effectively used as a feedstock for ethanol production by isomerizing the xylose to xylulose and then making the xylulose immediately available for the fermentation process. Because the xylose has been converted to its ketose isomer, xylulose, yeasts which can ferment glucose and xylulose can be used in this process. |
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Subject(s): | 435/162 435/94 435/161 435/175 435/180 435/182 |
Date Issued: | 1993-10-19 |
Title: | Bilayer pellet containing immobilized xylose isomerase and urease for the simultaneous isomerization and fermentation of xylose to ethanol. |
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Name(s): |
The University of Toledo, assignee Fournier, Ronald L., inventor Varanasi, Sasidhar, inventor Byers, James P., inventor |
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Type of Resource: | text | |
Genre: | patent | |
Publisher: | United States Patent and Trademark Office | |
Other Date: | Date Filed: 1991-10-31 | |
Date Issued: | 1993-10-19 | |
Physical Form: | application/pdf | |
Extent: | 8 p. | |
Abstract/Description: | A bilayered immobilized enzyme pellet and a process to manufacture this pellet are provided for use in a process involving the simultaneous isomerization of xylose to xylulose and fermentation of xylulose to ethanol. The bilayered pellet is able to maintain the environment where the isomerization reaction occurs within its optimum pH of 7.0 to 8.0 while the fermentation reaction occurs within its optimum pH range of 4.0 to 5.0. This process allows both xylose and glucose sugars to be effectively used as a feedstock for ethanol production by isomerizing the xylose to xylulose and then making the xylulose immediately available for the fermentation process. Because the xylose has been converted to its ketose isomer, xylulose, yeasts which can ferment glucose and xylulose can be used in this process. | |
Identifier(s): |
utpatents-US5254468 (IID) Patent No.: US5254468 (patno) Appl. No.: 07/785938 (appno) |
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Subject(s): |
435/162 435/94 435/161 435/175 435/180 435/182 |
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Held by: | United States Patent and Trademark Office (USPTO) Public Search Facility | |
Location: | University of Toledo Digital Repository | |
Rights Statement: | No Copyright - United States | |
In Collections: |