Abstract
The ability of growing yeastCandida utilis to accumulate cadmium ions from the cultivation broth depends on the carbon source used; xylose and glucose were tested here. For the two substrates, the course of cadmium bioaccumulation and total uptake were quite different. With glucose the maximum of bioaccumulation was about ten times higher than with xylose. The data were consistent with a simple mathematical model of process dynamics which assumes a Freudlich isotherm to describe the biosorption equilibrium and first-order dynamics to simulated the transient state.
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Abbreviations
- c :
-
cadmium ion concentration in the solution, mg/L
- k F :
-
proportionality constant in Freudlich sorption isotherm, L/g dry matter
- K s :
-
constant characterizing the substrate limitation, g/L
- n :
-
exponent in Freundlich sorption isotherm
- q :
-
cadmium content in the biomass, mg Cd per g dry matter
- S :
-
substrate concentration, g/L
- t :
-
current time, h
- X :
-
biomass concentration, g dry matter per L
- Y x/s :
-
yield coefficient
- μ:
-
specific growth rate, 1/h
- τ:
-
time constant of bioaccumulation, h
- Indices :
-
e equilibrium, 0 initial, max maximum
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Kujan, P., Votruba, J. & Kameník, V. Substrate dependent bioaccumulation of cadmium by growing yeastCandida utilis . Folia Microbiol 40, 288–292 (1995). https://doi.org/10.1007/BF02814210
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DOI: https://doi.org/10.1007/BF02814210