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Influence of the construction of porous spargers on lovastatin production by Aspergillus terreus ATCC 20,542 in a laboratory bubble column

  • Shahin Ansari
  • Hasan JaliliEmail author
  • Marcin Bizukojc
  • Abdeltif Amrane
Research Paper
  • 33 Downloads

Abstract

In bubble column bioreactors, the hydrodynamic behavior like mixing time, bubble size and morphology of filamentous fungi are influenced by the construction of spargers. Sparger pore size is an important factor influencing formation of bubbles. In this study for the first time, a 5-L bubble column bioreactor with different porous spargers was used to investigate the effect of mean air bubble diameter (at 0.36, 0.18 and 0.09 cm) on fungal growth, broth viscosity, fungal pellet morphology and lovastatin production by the filamentous fungus Aspergillus terreus. All cultivations were carried out at air flow rate equal to 0.5 Lair L−1 min−1. The viscosity of the broth was influenced by both biomass concentration and size of the fungal pellets. The highest values of viscosity were observed at bubbles of 0.09 cm diameter after 192 h of cultivation. The largest fluffy pellets and the highest yield of lovastatin (443 mg/L) were obtained at air bubbles diameter of 0.18 cm. Lovastatin yield on biomass growth in this condition was, respectively, 1.7-fold and 3.5-fold higher than in the cultivations performed with air bubbles of 0.36 and 0.09 cm diameters. These laboratory scale experiment indicates that air bubble diameter has the impact on lovastatin production and A. terreus culture conditions.

Keywords

Aspergillus terreus Bubble column bioreactor Lovastatin sparger design 

Notes

Acknowledgements

The authors would like to thank the staff of life science engineering laboratory for their assistance.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

449_2019_2118_MOESM1_ESM.doc (2.1 mb)
Supplementary file1 (DOC 2173 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Shahin Ansari
    • 1
  • Hasan Jalili
    • 1
    Email author
  • Marcin Bizukojc
    • 2
  • Abdeltif Amrane
    • 3
  1. 1.Department of Life Science Engineering, Faculty of New Sciences and TechnologiesUniversity of TehranTehranIran
  2. 2.Department of Bioprocess Engineering, Faculty of Process and Environmental EngineeringLodz University of TechnologyLodzPoland
  3. 3.Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR 6226RennesFrance

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