Living with heterogeneities in bioreactors
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Abstract
The presence of spatial gradients in fundamental culture parameters, such as dissolved gases, pH, concentration of substrates, and shear rate, among others, is an important problem that frequently occurs in large-scale bioreactors. This problem is caused by a deficient mixing that results from limitations inherent to traditional scale-up methods and practical constraints during large-scale bioreactor design and operation. When cultured in a heterogeneous environment, cells are continuously exposed to fluctuating conditions as they travel through the various zones of a bioreactor. Such fluctuations can affect cell metabolism, yields, and quality of the products of interest. In this review, the theoretical analyses that predict the existence of environmental gradients in bioreactors and their experimental confirmation are reviewed. The origins of gradients in common culture parameters and their effects on various organisms of biotechnological importance are discussed. In particular, studies based on the scale-down methodology, a convenient tool for assessing the effect of environmental heterogene ities, are surveyed.
Index Entries
Scale up scale down gradients bioreactors transientNomenclature
- C*
Dissolved oxygen concentration at saturation with air
- CFD
Computational fluid dynamics
- CHO
Chinese hamster ovary
- dCO2
Dissolved carbon dioxide
- dH2
Dissolved hydrogen
- Di
Impeller diameter
- DO
Dissolved oxygen concentration
- dw
Dry weight
- GFP
Green fluorescent protein
- HGH
Human growth hormone
- kLa
Volumetric oxygen transfer coefficient
- N
Impeller rotation speed
- PFR
Plug-flow reactor
- Po
Power input
- Q
Pump rate
- SD
Scale-down
- SDS
Scale-down system
- STR
Stirred-tank reactor
- tc
Circulation time
- TCA
Tricarboxylic acid
- tm
Mixing time
- tMT
Characteristic time for mass transfer
- tO2u
Characteristic time for oxygen uptake
- V
Volume
- ’
Density
- μ
Viscosity
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