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The inhibition of the maximum specific growth and fermentation rate of Zymomonas mobilis by ethanol
Author(s) -
Jöbses I. M. L.,
Roels J. A.
Publication year - 1986
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.260280412
Subject(s) - zymomonas mobilis , fermentation , ethanol , ethanol fermentation , chemistry , ethanol fuel , food science , biochemistry , microbiology and biotechnology , biochemical engineering , biology , engineering
The inhibition of the maximum specific growth and fermentation rate of Zymomonas mobilis by ethanol was studied in turbidostat cultures at constant and stepwise changed ethanol concentrations. Up to 50 g/L ethanol, the inhibition kinetics can be approximated by a linear relationship between the specific growth rate and the ethanol concentration. Above this level, deviations from this linearity are observed. The specific fermentation rates were less inhibited by ethanol than was the specific growth rate. The maximum ethanol concentration achieved was 72 g/L. The response time for the adaptation of a turbidstat culture to step changes in the ethanol concentration was markedly dependent on the concentration level, the response time being large at high ethanol concentrations.