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Bioreactor Controls-II01:18

Bioreactor Controls-II

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 fermentor via a sparger...

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Microfluidic Mixers for Studying Protein Folding
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A phaseguided passive batch microfluidic mixing chamber for isothermal amplification.

Sydney Hakenberg1, Matthias Hügle, Manfred Weidmann

  • 1Laboratory for Sensors, Department for Microsystem Engineering (IMTEK), Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany. hakenberg@imtek.de

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This study presents a novel microfluidic chip for rapid pathogen detection using isothermal nucleic acid amplification. It integrates passive mixing into the target chamber, reducing mixing time to one minute for faster results.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Molecular Diagnostics

Background:

  • Rapid pathogen detection is crucial for public health.
  • Isothermal nucleic acid amplification offers a promising approach for point-of-care diagnostics.
  • Microfluidic devices can enhance reaction kinetics and reduce sample volumes.

Purpose of the Study:

  • To develop a microfluidic chip for rapid, integrated pathogen detection.
  • To implement an efficient passive mixing strategy within a microfluidic chamber.
  • To demonstrate the feasibility of isothermal nucleic acid amplification with on-chip mixing.

Main Methods:

  • Design and fabrication of a novel microfluidic chip with integrated passive mixing using phaseguides.
  • Sequential filling of micro-chambers with different viscosity solutions.
  • Simulation of diffusive mixing times.
  • Fabrication using dry film resist technology and direct wafer bonding.
  • Implementation of an isothermal nucleic acid detection assay.

Main Results:

  • Successful demonstration of sequential filling and passive laminar flow mixing of 6.5 μl batches.
  • Novel phaseguide design enables complete integration of passive mixing into the target chamber.
  • Simulated reduction of mixing time from hours to one minute.
  • Simple and low-cost fabrication method.
  • Successful isothermal nucleic acid detection assay with fluorescence measurement after one-minute mixing.

Conclusions:

  • The developed microfluidic chip effectively integrates passive mixing for rapid sample preparation.
  • This technology significantly reduces reaction times, enabling faster pathogen detection.
  • The findings pave the way for fully integrated lab-on-a-chip systems for pathogen analysis.