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Related Experiment Videos

Fed-batch mode in shake flasks by slow-release technique.

M Jeude1, B Dittrich, H Niederschulte

  • 1Biochemical Engineering, RWTH Aachen University, Sammelbau Biologie, Worringer Weg 1, D-52074 Aachen, Germany.

Biotechnology and Bioengineering
|June 1, 2006
PubMed
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A novel silicone disc enables fed-batch fermentation in shake flasks for microbial strain screening. This method significantly improves biomass and protein yields, overcoming limitations of traditional batch cultures.

Area of Science:

  • Biotechnology
  • Microbial Fermentation
  • Bioprocess Engineering

Background:

  • Industrial microbial production typically uses fed-batch mode, but strain screening often employs batch mode, creating physiological discrepancies.
  • These differences in conditions during screening can lead to the selection of suboptimal microbial strains for industrial applications.
  • Existing methods for achieving fed-batch conditions in shake flasks are often complex or require specialized equipment.

Purpose of the Study:

  • To develop and evaluate a simple device for realizing fed-batch fermentation in shake flasks using controlled glucose diffusion.
  • To compare the performance of Hansenula polymorpha in fed-batch versus batch mode for biomass and recombinant protein production.
  • To assess the impact of the fed-batch strategy on overflow metabolism and overall yield.

Related Experiment Videos

Main Methods:

  • Development of silicone elastomer discs containing glucose crystals for slow-release feeding.
  • Cultivation of Hansenula polymorpha (wild-type and recombinant strains) in shake flasks using the developed feeding system.
  • Online monitoring of oxygen transfer rate (OTR) and respiratory quotient (RQ) using Respiration Activity Monitoring System (RAMOS).
  • Offline measurements of biomass, green fluorescent protein (GFP), pH, glucose, ethanol, and acetic acid.

Main Results:

  • The silicone disc system successfully enabled diffusion-controlled glucose feeding for H. polymorpha in shake flasks.
  • Fed-batch fermentation reduced overflow metabolism, increasing biomass yield by 85% to 0.38-0.47 g/g, comparable to lab-scale fermentors.
  • Recombinant GFP yield saw substantial improvements: a 35-fold increase in one medium (421 mg/L) and a 35-fold increase in another (88 mg/L) compared to batch mode.

Conclusions:

  • The developed silicone elastomer discs provide an effective and simple method for implementing fed-batch fermentation in shake flasks.
  • This approach mitigates physiological differences between screening and production conditions, enabling more accurate strain selection.
  • The improved yields in fed-batch mode demonstrate the potential for enhanced microbial production processes using this shake flask system.