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Batch fermentation kinetics of sugar beet molasses by Zymomonas mobilis

โœ Scribed by S. C. Park; J. Baratti

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
889 KB
Volume
38
Category
Article
ISSN
0006-3592

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โœฆ Synopsis

Abstract

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, ฮผ, 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.

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