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Fed-Batch Culture01:23

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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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Microfluidic Picoliter Bioreactor for Microbial Single-cell Analysis: Fabrication, System Setup, and Operation
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Flow-batch miniaturization.

Severino S Monte-Filho1, Marcelo B Lima, Stéfani I E Andrade

  • 1Universidade Federal da Paraíba, CCEN, Departamento de Química, Caixa Postal 5093, 58051-970, João Pessoa, Paraíba, Brazil.

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|November 9, 2011
PubMed
Summary
This summary is machine-generated.

This study presents the first micro-flow-batch analyzer (μFBA), a low-cost device for rapid chemical analysis. The μFBA offers high throughput and reduced reagent use, aligning with green chemistry principles.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Instrumentation Engineering

Background:

  • Traditional flow-batch analyzers can be costly and reagent-intensive.
  • There is a need for miniaturized analytical systems with improved efficiency and sustainability.
  • Microfabrication techniques offer potential for developing novel analytical platforms.

Purpose of the Study:

  • To develop and characterize the first micro-flow-batch analyzer (μFBA).
  • To demonstrate the μFBA's capability for photometric determination of Fe(II) in iron supplements.
  • To evaluate the system's performance in terms of cost, throughput, precision, and reagent consumption.

Main Methods:

  • Fabrication of the μFBA using urethane-acrylate photo-resist and UV-lithography.
  • Integration of a photometric detection system (LED/phototransistor) and a novel micro-mixing system.
  • In-line, in-chamber preparation of calibration solutions for Fe(II) determination using the 1,10-phenanthroline method.

Main Results:

  • The μFBA achieved high sample throughput (approx. 120 h⁻¹) with low relative standard deviations (approx. 1.1%).
  • Reagent consumption was significantly reduced (30 times less than the reference method).
  • Analytical results for Fe(II) were comparable to established reference methods and normal flow-batch systems.

Conclusions:

  • The developed μFBA is a low-cost, versatile, and robust analytical instrument.
  • The system demonstrates the feasibility of microfluidic approaches for efficient and sustainable chemical analysis.
  • The μFBA represents an advancement in micro-analytical instrumentation, adhering to Green Chemistry principles.