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Related Experiment Videos

Integrated microfluidic UV absorbance detector with attomol-level sensitivity for BSA.

L Zhu1, C S Lee, D L DeVoe

  • 1Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.

Lab on a Chip
|December 24, 2005
PubMed
Summary

A new silicon-in-plastic technology enables highly sensitive UV absorbance detection in microfluidic systems. This innovation achieves ultra-low detection limits for proteins, paving the way for advanced analytical tools.

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Area of Science:

  • Microfluidics
  • Optical Detection
  • Materials Science

Background:

  • Microfluidic devices offer miniaturized platforms for various analytical applications.
  • Integrating efficient detection systems into microfluidics remains a challenge.
  • UV absorbance detection is a common technique but requires sensitive instrumentation.

Purpose of the Study:

  • To develop an integrated UV absorbance detection system for polymer microfluidics.
  • To demonstrate the capability of silicon-in-plastic technology for seamless photodiode integration.
  • To characterize the performance of the developed detection system.

Main Methods:

  • Fabrication of polymer microfluidic systems with integrated bare UV photodiode chips using silicon-in-plastic technology.

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  • Utilizing bovine serum albumin (BSA) as a model protein for detection experiments.
  • Systematic measurement of detection limits, detection volume, dynamic range, and linearity.

    • Main Results:

    • Achieved exceptionally low concentration detection limits down to 15 nM for BSA.
    • Demonstrated mass detection limits as low as 9.8 amol for BSA.
    • Enabled sub-nanoliter detection volumes through direct photodiode integration.
    • Reported comprehensive system performance metrics including dynamic range and linearity.

    Conclusions:

    • The novel silicon-in-plastic technology successfully integrates UV photodiodes into microfluidic systems.
    • The developed system offers high sensitivity and low detection volumes for protein analysis.
    • This approach provides a robust platform for advanced microfluidic-based analytical devices.