Bilayer pellet containing immobilized xylose isomerase and ureas

Details Bilayer pellet containing immobilized xylose isomerase and ureas Bilayer pellet containing immobilized xylose isomerase and ureas

1991-10-31

1993-10-19

Naff, David M.

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing oxygen-containing organic compound

435 94, 435161, 435175, 435180, 435182, C12P 714, C12P 1924, C12N 1118, C12N 1104

Patent

active

052544680

ABSTRACT:
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.

REFERENCES:
patent: 4490468 (1984-12-01), Gong et al.
patent: 4506015 (1985-03-01), Ho et al.

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