» Articles » PMID: 19350298

Influence of Bioreactor Hydraulic Characteristics on a Saccharomyces Cerevisiae Fed-batch Culture: Hydrodynamic Modelling and Scale-down Investigations

Overview
Specialty Biotechnology
Date 2009 Apr 8
PMID 19350298
Citations 1
Authors
Affiliations
Soon will be listed here.
Abstract

Yeast is a widely used microorganism at the industrial level because of its biomass and metabolite production capabilities. However, due to its sensitivity to the glucose effect, problems occur during scale-up to the industrial scale. Hydrodynamic conditions are not ideal in large-scale bioreactors, and glucose concentration gradients can arise when these bioreactors are operating in fed-batch mode. We have studied the effects of such gradients in a scale-down reactor, which consists of a mixed part linked to a non-mixed part by a recirculation pump, in order to mimic the hydrodynamic conditions encountered at the large scale. During the fermentation tests in the scale-down reactor, there was a drop in both biomass yield (ratio between the biomass produced and the glucose added) and trehalose production and an increase in both fermentation time (time between inoculation and beginning of stationary phase) and ethanol production. We have developed a stochastic model which explains these effects as the result of an induction process determined mainly by the hydrodynamic conditions. The concentration profiles experienced by the microorganisms during the scale-down tests were expressed and linked to the biomass yields of the scale-down tests.

Citing Articles

The effect of growth rate on the production and vitality of non-Saccharomyces wine yeast in aerobic fed-batch culture.

Barkhuizen J, Coetzee G, van Rensburg E, Gorgens J Bioprocess Biosyst Eng. 2021; 44(12):2655-2665.

PMID: 34499236 DOI: 10.1007/s00449-021-02634-3.

References
1.
Sweere A, Mesters J, Janse L, Luyben K, Kossen N . Experimental simulation of oxygen profiles and their influence on baker's yeast production: I. One-fermentor system. Biotechnol Bioeng. 1988; 31(6):567-78. DOI: 10.1002/bit.260310609. View

2.
Hewitt C, Onyeaka H, Lewis G, Taylor I, Nienow A . A comparison of high cell density fed-batch fermentations involving both induced and non-induced recombinant Escherichia coli under well-mixed small-scale and simulated poorly mixed large-scale conditions. Biotechnol Bioeng. 2006; 96(3):495-505. DOI: 10.1002/bit.21127. View

3.
Neubauer P, Haggstrom L, Enfors S . Influence of substrate oscillations on acetate formation and growth yield in Escherichia coli glucose limited fed-batch cultivations. Biotechnol Bioeng. 1995; 47(2):139-46. DOI: 10.1002/bit.260470204. View

4.
Lara A, Leal L, Flores N, Gosset G, Bolivar F, Ramirez O . Transcriptional and metabolic response of recombinant Escherichia coli to spatial dissolved oxygen tension gradients simulated in a scale-down system. Biotechnol Bioeng. 2005; 93(2):372-85. DOI: 10.1002/bit.20704. View

5.
Sandoval-Basurto E, Gosset G, Bolivar F, Ramirez O . Culture of Escherichia coli under dissolved oxygen gradients simulated in a two-compartment scale-down system: metabolic response and production of recombinant protein. Biotechnol Bioeng. 2004; 89(4):453-63. DOI: 10.1002/bit.20383. View