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Agitation effects on submerged growth and product formation of Aspergillus niger

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Abstract

Product formation of mycelial organisms, like Aspergillus niger, is intimately connected with their morphology. Pellet morphology is often requested for product formation. Therefore, it is important to reveal the influence of the hydrodynamic conditions on the morphological development. In the present study, pellet morphology and glucoamylase formation were studied under different agitation intensities of A. niger AB1.13. For pellet formation inside the bioreactor, without the use of precultures, it is necessary to work at low energy dissipation rates. Biomass growth and glucoamylase activity were correlated with energy dissipation. Furthermore, product yield was analysed in dependence of pellet size and concentration. The present work shows that simple equations based on Monod-kinetics can describe growth and product formation, in general, also in mycelian organisms. All measured morphological data, like pellet concentration, as well as glucoamylase formation, strongly depend on the hydrodynamic conditions.

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Abbreviations

α :

Growth-associated product formation coefficient (μKat g−1)

β :

Non-growth-associated product formation coefficient (μKat g−1h−1)

ε :

Energy dissipation (W kg−1)

μ :

Specific growth rate (h−1)

μ max :

Maximum specific growth rate (h−1)

ρ P :

Density of wet pellet (kg m−3)

EA GAM :

Glucoamylase enzyme activity in the bulk phase (μKat l−1)

C Glu :

Glucose concentration (g l−1)

\( C_{{{\text{O}}_{2} }} \) :

Oxygen concentration (bulk) (g l−1)

\( C^{ * }_{{{\text{O}}_{2} }} \) :

Saturation concentration of oxygen (bulk) (g l−1)

C P :

Pellet concentration (l−1)

d P :

Pellet diameter (mm)

K Glu :

Saturation coefficient glucose (g l−1)

\( K_{{{\text{O}}_{2} }} \) :

Saturation coefficient oxygen (g l−1)

k L a :

Volumetric gas liquid mass transfer coefficient (h−1)

R GAM :

Glucoamylase production rate (μKat l−1h−1)

R Glu :

Glucose consumption rate (g l−1h−1)

\( R_{{{\text{O}}_{2} }} \) :

Oxygen consumption rate (g l−1h−1)

R X :

Biomass growth rate (g l−1h−1)

X :

Biomass concentration (g l−1)

Y OX :

Yield coefficient of biomass on oxygen (g g−1)

Y SX :

Yield coefficient of biomass on glucose (g g−1)

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Acknowledgements

The authors acknowledge financial support provided by the German Research Foundation. This project is part of the SFB 578 “Development of biotechnological processes by integrating genetic and engineering methods—from gene to product”.

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Correspondence to Sven Kelly.

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Kelly, S., Grimm, L.H., Hengstler, J. et al. Agitation effects on submerged growth and product formation of Aspergillus niger. Bioprocess Biosyst Eng 26, 315–323 (2004). https://doi.org/10.1007/s00449-004-0368-y

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