Document Type

Patent

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.

Patent Country

US

Patent Number

US5254468

Publication Date

10-19-1993

Assignee(s)

The University of Toledo

Application Number

07/785938

Filing Date

October 1991

Primary Class

435/162

Secondary Class

435/94; 435/161; 435/175; 435/180; 435/182

Rights

These materials are free of copyright restrictions and are in the public domain within the United States only. The USPTO reserves the right to assert copyright protection internationally.

Institution

The University of Toledo

Repository

University of Toledo Libraries

Digital Publisher

Digital Initiatives

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