Production of ethanol from biopolymers by anaerobic, thermophilic, and extreme thermophilic bacteria. II. Thermoanaerobacter ethanolicus JW200 and its mutants in batch cultures and resting cell experiments
Several thermophilic and extreme thermophilic anaerobic bacteria can utilize hemicellulose (xylan polymer) from birch- and beechwood directly. Thermoanaerobacter ethanolicus JW200 exhibited the highest ethanol formation, although the extracellular xylanase and xylosidase activities were very low. All bacteria rapidly utilized xylose before the polymers were utilized at a lower rate. With resting cell suspensions of T. ethanolicus and its mutants, the ethanol formation rates were as high as 60 mmol (2.76 g) and 30 mmol (1.3 g) ethanol per L per h from glucose and xylose, respectively. After 1 hr the ethanol productions in the concentrated cell suspensions were linear for over 10 h from glucose of xylose; however, with soluble starch (DE 10) the rates were increasing with time.From these experiments it is concluded that the continuous culture experiments with hemicellulosic material and/or starch have to be performed with recycling of the cells and the extracellular enzymes.
- Research Organization:
- Univ. of Georgia, Athens
- OSTI ID:
- 6026948
- Journal Information:
- Biotechnol. Bioeng. Symp.; (United States), Journal Name: Biotechnol. Bioeng. Symp.; (United States) Vol. 13; ISSN BIBSB
- Country of Publication:
- United States
- Language:
- English
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ALCOHOLS
ALDEHYDES
ANAEROBIC DIGESTION
BACTERIA
BIOCONVERSION
BIOSYNTHESIS
CARBOHYDRATES
CELL RECYCLE
CONTINUOUS CULTURE
DIGESTION
ETHANOL
GLUCOSE
HEMICELLULOSE
HEXOSES
HYDROXY COMPOUNDS
MANAGEMENT
MICROORGANISMS
MONOSACCHARIDES
MUTANTS
ORGANIC COMPOUNDS
PENTOSES
POLYSACCHARIDES
PROCESSING
PRODUCTIVITY
SACCHARIDES
SYNTHESIS
THERMOPHILIC CONDITIONS
WASTE MANAGEMENT
WASTE PROCESSING
XYLOSE