Aerobic fermentation of D-xylose to ethanol by Clavispora sp
Eleven strains of an undescribed species of Clavispora fermented D-xylose directly to ethanol under aerobic conditions. Strain UWO(PS)83-877-1 was grown in a medium containing 2% D-xylose and 0.5% yeast extract and the following results were obtained: ethanol yield coefficient (ethanol/D-xylose), 0.29 g/g (57.4% of theoretical); cell yield coefficient (dry biomass/D-xylose), 0.25 g/g; maximum ethanol concentration, 5.9 g/liter; maximum volumetric ethanol productivity, 0.11 g/liter/hour. With initial D-xylose concentrations of 40, 60, and 80 g/liter, maximum ethanol concentrations of 8.8, 10.9, and 9.8 g/liter were obtained, respectively (57.2, 57.1 and 48.3% of theoretical). Ethanol was found to inhibit the fermentation of D-xylose (Kp = 0.58 g/liter) more than the fermentation of glucose (Kp = 6.5 g/liter). The performance of this yeast compared favourably with that reported for some other D-xylose-fermenting yeasts.
- Research Organization:
- Univ. of Western Ontario, London
- OSTI ID:
- 5597250
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 50:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ETHANOL
BIOSYNTHESIS
XYLOSE
FERMENTATION
YEASTS
PRODUCTIVITY
AEROBIC CONDITIONS
CHEMICAL REACTION YIELD
ALCOHOLS
ALDEHYDES
BIOCONVERSION
CARBOHYDRATES
FUNGI
HYDROXY COMPOUNDS
MICROORGANISMS
MONOSACCHARIDES
ORGANIC COMPOUNDS
PENTOSES
PLANTS
SACCHARIDES
SYNTHESIS
YIELDS
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