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Microchip electrophoretic immunoassay for serum cortisol

L B Koutny1, D Schmalzing, T A Taylor

  • 1PerSeptive Biosystems, Framingham, Massachusetts 01701, USA.

Analytical Chemistry
|January 1, 1996
PubMed
Summary
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This study introduces a microchip electrophoretic system for rapid cortisol analysis in blood serum. The novel immunoassay enables quick, automated, and high-throughput clinical sample testing without prior sample preparation.

Area of Science:

  • Analytical Chemistry
  • Biomedical Engineering
  • Clinical Diagnostics

Background:

  • Microchip electrophoretic systems offer advantages in size, ruggedness, and automation for immunoassays.
  • Traditional immunoassays can be time-consuming and require extensive sample preparation.

Purpose of the Study:

  • To develop and validate a microchip electrophoretic immunoassay for cortisol determination.
  • To assess the feasibility of rapid, automated clinical sample analysis using this technology.

Main Methods:

  • Competitive immunoassay performed on a microchip electrophoretic system with micromachined fused silica channels.
  • Separation and quantitation of free and bound labeled antigen.
  • Direct analysis of cortisol in blood serum without extraction.

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Main Results:

  • Accurate determination of cortisol in blood serum within the clinical range (1-60 µg/dL).
  • Separation achieved in under 30 seconds.
  • Demonstrated potential for high-throughput analysis via parallel multi-channel operation.

Conclusions:

  • Microchip electrophoretic immunoassays are a promising technology for rapid clinical diagnostics.
  • The developed system offers efficient, automated, and sensitive cortisol analysis.
  • This approach minimizes sample preparation, enhancing workflow efficiency in clinical laboratories.