Studies on the simultaneous enzymatic isomerization and yeast fermentation of D-xylose

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5149518

The addition of the enzyme D-xylose isomerase (glucose isomerase) to fermentation medium facilitates the conversion of D-xylose into ethanol by a two step process in which D-xylose is first isomerized to D-xylose, which is in turn converted to ethanol by yeast. Detailed kinetic studies were conducted independently for the isomerization reaction and for the fermentation of D-xylose by the yeast Schizosaccharomyces pombe. The kinetics of the isomerization reaction has been examined using a differential batch reactor at different temperatures and pH value. The kinetics of the utilization of D-xylose by the yeast Schizosaccharomyces pombe has been examined in presence of D-xylose and ethanol under anaerobic batch conditions. The effects of the concentration of each of the two sugars upon the production of ethanol were also examined. A combined model has been formulated that predicts the performance of the batch conversion of D-xylose to ethanol by the simultaneous isomerization/fermentation process. A reasonable agreement was found between experimental data and values calculated from the model.

• Research Organization: Purdue Univ., Lafayette, IN (USA)
• OSTI ID: 5149518
• Country of Publication: United States
• Language: English

Related Subjects

550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALCOHOLS
ALDEHYDES
BIOCHEMICAL REACTION KINETICS
BIOCONVERSION
BIOSYNTHESIS
CARBOHYDRATES
CHEMICAL REACTIONS
ENZYMES
ETHANOL
FERMENTATION
FUNGI
HYDROXY COMPOUNDS
ISOMERASES
ISOMERIZATION
KINETICS
MATHEMATICAL MODELS
MICROORGANISMS
MONOSACCHARIDES
ORGANIC COMPOUNDS
PENTOSES
PLANTS
REACTION KINETICS
SACCHARIDES
SACCHAROMYCES
SYNTHESIS
XYLOSE
YEASTS