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Continuous ethanol production from Jerusalem artichoke tubers. I. Use of free cells of Kluyveromyces marxianus
Author(s) -
Margaritis Argyrios,
Bajpai Pratima
Publication year - 1982
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260240702
Subject(s) - kluyveromyces marxianus , dilution , jerusalem artichoke , bioreactor , ethanol fuel , chemistry , ethanol , fermentation , sugar , biomass (ecology) , ethanol fermentation , food science , yeast , biochemistry , botany , chromatography , biology , saccharomyces cerevisiae , agronomy , organic chemistry , physics , thermodynamics
The Continuous fermentation of Jerusalem artichoke juice to ethanol by free cells of Kluyveromyces marxianus UCD (FST) 55–82 has been studied in a continuous‐stirred‐tank bioreactor at 35°C and pH 4.6. A maximum yield of 90% of the theoretical was obtained at a dilution rate of 0.05 h −1 . About 95% of the sugars were utilized at dilution rates lower than 0.15 h −1 . Volumetric ethanol productivity and volumetric biomass productivity reached maximum values of 7 g ETOH/L/h and 0.6 g dry wt/L/h, respectively, at a dilution rate of 0.2 h −1 . The maintenance energy coefficient for K. marxianus culture was found to be 0.46 g sugar/g biomass/h/ Oscillatory behavior was following a change in dilution rate from a previous steady state and from batch to continuous culture. Values of specific ethanol production rate and specific sugar uptake were found to increase almost linearly with the increase of the dilution rate. The maximum specific ethanol production rate and maximum specific sugar uptake rate were found to be 2.6 g ethanol/g/ cell/h and 7.9 sugars/g cell/h, respectively. Washout occurred at a dilution rate of 0.41 h −1 .