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Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

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Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
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Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
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Fed-Batch Culture

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Fed-batch culture is a widely used bioprocessing strategy combining aspects of batch culture with controlled substrate feeding to optimize cell growth and product formation. In this semi-closed system, nutrients are strategically added during fermentation, while the accumulated products and biomass remain within the bioreactor until the end of the operation. This controlled addition of substrates allows for better management of growth kinetics, nutrient limitation, and metabolite...
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The scale-up of microbial fermentation processes is essential in industrial biotechnology, allowing the transition from laboratory-scale experiments to commercial-scale production while aiming to maintain product yield and quality. This process requires meticulous adjustment of equipment design, process parameters, and contamination control strategies to accommodate increasing culture volumes.At the laboratory scale, cultures are typically maintained in 1 to 10-liter glass or autoclavable...
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Diffusion-driven fed-batch fermentation in perforated ring flasks.

Clara Lüchtrath1, Felix Lamping1, Sven Hansen2

  • 1AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany.

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|May 17, 2024
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Summary

This study introduces a novel perforated ring flask system for rapid bioprocess development, enhancing oxygen transfer rates by 3.5 times compared to traditional flasks. This innovation facilitates efficient screening and process optimization in biotechnology.

Keywords:
Additive manufacturingFed-batchOxygen transfer rateRespiration activity monitoring systemRing flask

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Area of Science:

  • Biotechnology
  • Bioprocess Engineering
  • Chemical Engineering

Background:

  • Traditional Erlenmeyer flasks have limitations in monitoring and feeding during bioprocess development.
  • Rapid screening and optimization are crucial for efficient biotechnological advancements.

Purpose of the Study:

  • To introduce simultaneous membrane-based feeding and oxygen transfer rate monitoring in a perforated ring flask system.
  • To enable rapid bioprocess development and optimization.

Main Methods:

  • A 3D-printed adapter was developed for oxygen transfer rate monitoring in perforated ring flasks.
  • Batch and fed-batch experiments were conducted using Escherichia coli.
  • Different diffusion rates and feed solutions were tested.

Main Results:

  • Perforated ring flasks achieved 3.5 times higher oxygen transfer capacity (80 mmol L⁻¹ h⁻¹) than Erlenmeyer flasks in batch cultivations.
  • Successful fed-batch experiments demonstrated the system's capability with high glucose concentrations.
  • Ammonium limitation was identified via oxygen transfer rate monitoring and resolved by adjusting feed composition.

Conclusions:

  • The combination of membrane-based feeding, online monitoring, and the perforated ring flask is a promising tool for bioprocess development.
  • This integrated system enhances screening capabilities in biotechnology.
  • The system allows for precise control and optimization of bioprocesses.