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Respective effects of sodium and chloride ions on filament formation and growth and ethanol production in Zymomonas mobilis fermentations
Author(s) -
Vriesekoop F.,
Rasmusson M.,
Pamment N.B.
Publication year - 2002
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1046/j.1472-765x.2002.01137.x
Subject(s) - zymomonas mobilis , chemistry , ammonium chloride , ethanol , fermentation , sodium , chloride , ammonium , hydrochloric acid , ethanol fuel , nuclear chemistry , inorganic ions , biochemistry , inorganic chemistry , ion , organic chemistry
Aims: To elucidate the separate effects of the cation and anion inZymomonas mobilis cultures inhibited by NaCl. Methods and Results: In batch cultures containing 0·175 mol l−1NaCl,Z. mobilisdeveloped filaments and growth and ethanol production were inhibited. Chloride ions (added as 0·175 mol l−1NH4Cl) produced similar filamentous growth, while sodium ions at the same concentration (as Na2 SO 4 ) did not. Growth and ethanol production were more strongly inhibited by Na 2 SO 4 than by NH 4 Cl. Ammonium and sulphate ions had no inhibitory effects at these concentrations. Conclusions: Filament formation in NaCl‐inhibitedZ. mobilis is due entirely to the chloride ion, while the sodium ion has the major effect on growth and ethanol production. Significance and Impact of the Study: To avoid filamentous growth, chloride ions should be excluded from ethanol fermentations employingZ. mobilis , e.g. sulphuric is preferable to hydrochloric acid when hydrolysing lignocellulosic substrates prior to fermentation.