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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Related Experiment Video

Updated: Feb 6, 2026

Multiplex Cytokine Profiling of Stimulated Mouse Splenocytes Using a Cytometric Bead-based Immunoassay Platform
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Microfluidic implementation of functional cytometric microbeads for improved multiplexed cytokine quantification.

Ya Liu1, Jiyu Li1, Dinglong Hu1

  • 1Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China.

Biomicrofluidics
|August 28, 2018
PubMed
Summary

This study optimized a microfluidic device for microbead-based cytokine detection, significantly reducing sample volume and reaction time. The enhanced system achieves a lower detection limit for molecular profiling in biomedical applications.

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Area of Science:

  • Biomedical Engineering
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Functional microbeads are widely used for molecular identification, compatible with flow cytometry.
  • Current limitations include large sample volume requirements, limited detection sensitivity, complex handling, and long reaction times.

Purpose of the Study:

  • To optimize an automated microfluidic device for reagent mixing and dynamic cytokine detection.
  • To overcome the technical hurdles associated with conventional microbead assays.

Main Methods:

  • Developed an automated microbead-based microfluidic device.
  • Utilized fluorescence microscopy for microbead quantification, replacing flow cytometry.
  • Optimized operation parameters including mixing duration, sample volume, and image analysis.

Main Results:

  • Achieved a significantly reduced sample volume (<5 μl).
  • Lowered the cytokine detection limit to approximately 5 pg/ml.
  • Shortened the overall process time to approximately 30 minutes.

Conclusions:

  • The optimized microfluidic device offers improved performance for microbead-based assays.
  • This strategy enables sensitive and rapid molecular profiling with reduced sample input.
  • The microfluidic approach is adaptable for various functional microbeads and broad biomedical applications.