Evaluation of the effects and interactions of mixing and oxygen transfer on the production of Fab’ antibody fragments in Escherichia coli fermentation with gas blending

  • Roeb García-Arrazola
  • Pierre Dawson
  • Ian Buchanan
  • Billy Doyle
  • Tom Fearn
  • Nigel Titchener-Hooker
  • Frank Baganz
Original papers


Fermentations carried out at 450-L and 20-L scale to produce Fab’ antibody fragments indicated a serious problem to control levels of dissolved oxygen in the broth due to the large oxygen demand at high cell densities. Dissolved oxygen tension (DOT) dropped to zero during the induction phase and it was hypothesised that this could limit product formation due to inadequate oxygen supply. A gas blending system at 20-L scale was employed to address this problem and a factorial 22 experimental design was executed to evaluate independently the effects and interaction of two main engineering factors: agitation rate and DOT level (both related to mixing and oxygen transfer in the broth) on Fab’ yields. By comparison to the non-gas blending system, results in the gas blending system at same scale showed an increase in the production of Fab’ by 77% independent of the DOT level when using an agitation rate of 500 rpm level and by 50% at an agitation rate of 1,000 rpm with 30% DOT. Product localisation in the cell periplasm of >90% was obtained in all fermentations. Results obtained encourage further studies at 450-L scale initially, to evaluate the potential of gas blending for the industrial production of Fab’ antibody fragments.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Roeb García-Arrazola
    • 1
  • Pierre Dawson
    • 1
  • Ian Buchanan
    • 1
  • Billy Doyle
    • 1
  • Tom Fearn
    • 2
  • Nigel Titchener-Hooker
    • 1
  • Frank Baganz
    • 1
  1. 1.The Advanced Centre for Biochemical Engineering, Department of Biochemical EngineeringUniversity College LondonLondonUK
  2. 2.Department of Statistical ScienceUniversity College LondonLondonUK

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