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Related Experiment Videos

High-sensitivity miniaturized immunoassays for tumor necrosis factor alpha using microfluidic systems.

Sandro Cesaro-Tadic1, Gregor Dernick, David Juncker

  • 1IBM Research GmbH, Zurich Research Laboratory, Saumerstrasse 4, CH-8803 Ruschlikon, Switzerland.

Lab on a Chip
|December 1, 2004
PubMed
Summary

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Microfluidic chips enable sensitive detection of tumor necrosis factor alpha (TNF-alpha) using minimal sample volumes. This novel assay achieves picomolar sensitivity through controlled evaporation and fluorescence immunoassay techniques.

Area of Science:

  • Biotechnology and Biomedical Engineering
  • Assay Development
  • Cytokine Detection

Background:

  • Tumor necrosis factor alpha (TNF-alpha) is a critical cytokine in biological processes.
  • Sensitive detection of TNF-alpha is essential for various diagnostic and research applications.
  • Existing methods often require larger sample volumes and complex procedures.

Purpose of the Study:

  • To develop a highly sensitive microfluidic chip-based assay for TNF-alpha detection.
  • To utilize sub-microliter sample volumes and achieve picomolar sensitivity.
  • To optimize assay conditions for enhanced sensitivity and reliability.

Main Methods:

  • Design and fabrication of microfluidic chips with independent capillary systems (CSs).
  • Utilizing capillary forces for spontaneous filling and self-regulating mechanisms to prevent drainage.

Related Experiment Videos

  • Employing a sandwich fluorescence immunoassay on poly(dimethylsiloxane) (PDMS) surfaces with optimized antibody concentrations and long incubation times facilitated by controlled evaporation.

    • Main Results:

    • Achieved picomolar sensitivity (approximately 1.14 pM or 20 pg/mL) for TNF-alpha detection.
    • Demonstrated the effectiveness of the microfluidic chip design with 170 assay sites in a small area (0.6 mm^2).
    • Confirmed PDMS compatibility for high-sensitivity fluorescence assays using fluorophores with excitation wavelengths >= 580 nm.

    Conclusions:

    • The developed microfluidic chip assay offers a sensitive and efficient method for detecting TNF-alpha.
    • The system's design, incorporating controlled evaporation for long incubation, is key to achieving high sensitivity.
    • This technology holds promise for low-volume, high-sensitivity cytokine analysis in biological samples.