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Simultaneous saccharification: fermentation with Zymomonas mobilis

Journal Article · · Biotechnol. Bioeng.; (United States)
;
In recent years, an ethanol production process has been developed which utilizes Trichoderma reesei cellulase and Candida brassicae IFO 1664 in the simultaneous saccharification/fermentation (SSF) of cellulose to ethanol. The direct production of ethanol from cellulose in an SSF process alleviates the problem of end production inhibition. Glucose does not accumulate in this system, but rather is fermented to ethanol immediately following saccharification. The result is an increase in yield of 25% or greater as compared with separate processes of saccharification and fermentation. An alternative organisms which might be used in place of yeasts in ethanol production processes is Zymomonas mobilis. The optimum temperature for hydrolysis of cellulose by Trichoderma reesei cellulases is 50/sup 0/C. Since this hydrolysis is the rate limiting step in the SSF process, it is advantageous to utilize the most temperature tolerant ethanol producer available. Candida brassicae is currently the organism of choice due to its ability to produce ethanol efficiently at 40/sup 0/C. This investigation reports on the screening of Zymomonas strains and evaluating the feasibility of utilizing the most temperature tolerant strain in place of C. brassicae in SSF.
Research Organization:
Reparto Universidad, San German, Puerto Rico
OSTI ID:
6261979
Journal Information:
Biotechnol. Bioeng.; (United States), Journal Name: Biotechnol. Bioeng.; (United States) Vol. 28:1; ISSN BIBIA
Country of Publication:
United States
Language:
English

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Related Subjects

09 BIOMASS FUELS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALCOHOLS
ALDEHYDES
ANAEROBIC DIGESTION
BACTERIA
BIOCONVERSION
CANDIDA
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
DECOMPOSITION
DIGESTION
ETHANOL
FERMENTATION
FUNGI
GLUCOSE
GROWTH
HEXOSES
HYDROLYSIS
HYDROXY COMPOUNDS
LYSIS
MANAGEMENT
MICROORGANISMS
MONOSACCHARIDES
ORGANIC COMPOUNDS
PLANTS
POLYSACCHARIDES
PROCESSING
SACCHARIDES
SACCHARIFICATION
SOLVOLYSIS
TEMPERATURE DEPENDENCE
TOLERANCE
TRICHODERMA
TRICHODERMA VIRIDE
WASTE MANAGEMENT
WASTE PROCESSING
YEASTS
YIELDS
ZYMOMONAS MOBILIS