Folia Microbiologica

, Volume 36, Issue 5, pp 478–484 | Cite as

Effect of external pH on ethanol oxidation byCandida utilis

  • J. Páca
  • J. Votruba
Papers
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Revised:

Abstract

The external pH affects both ethanol and oxygen uptake rates by nongrowing cells ofCandida utilis suspended either in distilled water or in phthalate buffer. The buffering properties of organic acids control the maximum rates of exogenous respiration and ethanol uptake. The substrate limitation of ethanol uptake rate and endogenous respiration rate increase proportionally with increasing hydrogen ion concentration in the medium.

Keywords

Phthalate Phthalic Acid Oxygen Uptake Rate Ethanol Uptake Ethanol Oxidation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Symbols

CE

concentration of ethanol, mmol/L

[H+]

concentration of hydrogen ions in the medium, mol/L

k1

parameter in Eq.4, mmol O2 per g dry matter per min

k2

parameter in Eq.4, mmol O2·mol[H+]2 per g dry matter per h per L2

KE

saturation constant for ethanol dissimilation, mmol/L

pK

negative logarithm of dissociation constant, —log(mol/L)

pH0

initial pH value of the medium, —log(mol/L)

qE,qEmax

actual and maximum specific rate of ethanol dissimilation, mmol per g dry matter per h

qO2,qO2

exogenous and endogenous respiration rate, mmol O2 per g dry matter per h

t

time after ethanol feeding, h

T

time constant, characterizing the duration of lag phase, h

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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic 1991

Authors and Affiliations

  • J. Páca
    • 1
  • J. Votruba
    • 2
  1. 1.Department of Fermentation Chemistry and BioengineeringInstitute of Chemical TechnologyPrague 6
  2. 2.Institute of MicrobiologyCzechoslovak Academy of SciencesPrague 4Czechoslovakia

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