The effects of potassium and chloride ions on the ethanolic fermentation of sucrose by Zymomonas mobilis 2716

Kirk L.A. and Doelle H.W. (1992) The effects of potassium and chloride ions on the ethanolic fermentation of sucrose by Zymomonas mobilis 2716. Applied Microbiology and Biotechnology, 37 1: 88-93. doi:10.1007/BF00174209


Author Kirk L.A.
Doelle H.W.
Title The effects of potassium and chloride ions on the ethanolic fermentation of sucrose by Zymomonas mobilis 2716
Journal name Applied Microbiology and Biotechnology   Check publisher's open access policy
ISSN 0175-7598
Publication date 1992-01-01
Sub-type Article (original research)
DOI 10.1007/BF00174209
Open Access Status Not yet assessed
Volume 37
Issue 1
Start page 88
End page 93
Total pages 6
Publisher Springer-Verlag
Subject 2726 Microbiology (medical)
2404 Microbiology
1502 Banking, Finance and Investment
1305 Biotechnology
Abstract The inclusion of specific salts in Zymomonas mobilis batch sucrose fermentations can limit by-product formation. Sorbitol and fructo-oligosaccharide formation can be reduced and ethanol production enhanced by manipulating mineral salt concentrations. Chloride salts reduced the production of biomass and sorbitol in favour of fructo-oligosaccharide formation at concentrations lower than 10 g NaCl/l or MgCl2. Higher concentrations led to the accumulation of glucose and fructose. Low concentrations of KH2PO4 (<20 g/l) enhanced biomass formation, and the concomitant reduction in sorbitol and fructo-oligosaccharides favoured enhanced ethanol formation. At concentrations above 20 g/l, its effects were similar to those obtained with the chloride salts. Invertase addition at the start of fermentation increased sorbitol formation, whereas addition after the completion of sucrose hydrolysis resulted in the conversion of fructo-oligosaccharides formed into fructose or ethanol. Fermentation with 250 g/l of sugar-cane syrup ( = 130 g sucrose/l) in the presence of 8 g KH2PO4/l, with 0.05 g invertase/l added on the completion of sucrose hydrolysis, resulted in a conversion efficiency of 94% with complete carbon accountability, and only 7 g sorbitol/l.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 14 Jun 2016, 10:34:29 EST by System User