Ethanol production by thermophilic bacteria: metabolic control of end product formation in Thermoanaerobium brockii

Journal Article · Wed Apr 01 04:00:00 EST 1981 · J. Bacteriol.; (United States)

OSTI ID:6461676

Ben-Bassat, A; Lamed, R; Zeikus, J G

Specific changes in the chemical and microbial composition fof Thermoanaerobium brockii fermentations were compared and related to alterations of process rates, end product yields, and growth parameters. Fermentation of starch as compared with glucose was associated with significant decreases in growth rate and intracellular fructose-1,6-bisphosphate concentration and with a dramatic increase in the ethanols/lactate product ratio. Glucose or pyruvate fermentation in the presence of acetone was correlated with increased substrate consumption, growth, acetate yield, and quantitative reduction of acetone to isopropanol in lieu of normal reduced fermentation products. Glucose fermentation in the presence of exogenous hydrogen was associated with inhibition of endogenous H/sub 2/ production. The effects of exogenous hydrogen on glucose fermentation were totally reversed by the addition of acetone. Glucose fermentation in coculture with Methanobacterium thermoautotrophicum correlated with increased growth, acetate yield, and the formation of methane in lieu of monoculture reduced products.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 6461676
• Journal Information: J. Bacteriol.; (United States), Journal Name: J. Bacteriol.; (United States) Vol. 146:1; ISSN JOBAA
• Country of Publication: United States
• Language: English

Related Subjects

550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ACETONE
ALCOHOLS
ALDEHYDES
BACTERIA
BIOCONVERSION
CARBOHYDRATES
CARBOXYLIC ACIDS
CATABOLISM
COMPARATIVE EVALUATIONS
ELEMENTS
ENZYME ACTIVITY
ETHANOL
FERMENTATION
GLUCOSE
HEXOSES
HYDROGEN
HYDROXY COMPOUNDS
KETO ACIDS
KETONES
METABOLISM
MICROORGANISMS
MONOSACCHARIDES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
POLYSACCHARIDES
PRODUCTION
PYRUVIC ACID
REAGENTS
SACCHARIDES
STARCH
SUBSTRATES
THERMOACTINOMYCES