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Batch fermentation kinetics of sugar beet molasses by Zymomonas mobilis
Author(s) -
Park S. C.,
Baratti J.
Publication year - 1991
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.260380312
Subject(s) - zymomonas mobilis , fermentation , chemistry , sugar beet , food science , ethanol fuel , ethanol , hydrolysis , yield (engineering) , biochemistry , yeast , biomass (ecology) , ethanol fermentation , sugar , anabolism , enzymatic hydrolysis , corn steep liquor , yeast extract , agronomy , biology , materials science , metallurgy
A new osmotolerant mutant strain of Zymomonas mobilis was successfully used for ethanol production from beet molasses. Addition of magnesium sulfate to hydrolyzed molasses allowed repeated growth without the need of yeast extract addition. The kinetics and yields parameters of fermentation on media with different molasses concentrations were calculated. The anabolic parameters (specific growth rate, μ, and biomass yield, Y X / S ) were inhibited at elevated molasses concentrations while the catabolic parameters (specific ethanol productivity, q p , and ethanol yield, Y p / s ) were not significantly affected. In addition to ethanol and substrate inhibition, osmotic pressure effects can explain the observed results.