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Folia Microbiologica

, Volume 36, Issue 5, pp 485–492 | Cite as

Effect of external pH on acidification and excretion of ethanol intermediates byCandida utilis

  • J. Páca
  • J. Votruba
Papers

Abstract

External pH affects the acidification induced by ethanol. The apparent specific rate of acidification depends on the dissociation properties and production of carbon dioxide, acetic and lactic acid which are intermediates of ethanol oxidation. The organic acids are transported by Nernst — Einstein diffusion. We designed and identified a new and simple mathematical model that allows us to describe the effect of external pH on nonstationary transport of dissociated intermediates of ethanol oxidation.

Keywords

Ethanol Oxidation Candida Utilis Ethanol Addition Secondary Active Transport Maximum Specific Rate 
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

C

concentration of intermediate, mg/L

D

diffusion coefficient

dC/dl, dE/dl

gradients of concentration and electrical potential across the cell wall

F

Faraday constant

[H+]

concentration of hydrogen ions, mol/L

N

total flux of ionizable species across the cell wall

P, K

parameters (in Eq. 4)

pH0

initial pH value, -log(mol/L)

rH+

acidification power, mmol H+ per g dry mass per h

R

universal gas constant

T

absolute temperature

t

time, h

X

dry mass of biomass, g/L

z

charge of ionized molecule

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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 4

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