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Detection of multiple toxic agents using a planar array immunosensor

R M Wadkins1, J P Golden, L M Pritsiolas

  • 1Naval Research Laboratory, Center for Bio/Molecular Science & Engineering, Washington, DC 20375-5348, USA.

Biosensors & Bioelectronics
|June 27, 1998
PubMed
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This study presents a novel planar array immunosensor for simultaneous detection of staphylococcal enterotoxin B (SEB), ricin, and Yersinia pestis. The device achieves sensitive and quantitative toxin measurement using a charge-coupled device (CCD) detector.

Area of Science:

  • Biosensing and Immunoassay Development
  • Analytical Chemistry
  • Biotechnology

Background:

  • Simultaneous detection of multiple toxic analytes is crucial for biodefense and public health.
  • Existing immunosensor technologies face challenges in sensitivity, specificity, and multiplexing capabilities.

Purpose of the Study:

  • To develop and validate a planar array immunosensor for the simultaneous detection of three key toxic analytes.
  • To establish a sensitive and quantitative method for toxin identification and quantification.

Main Methods:

  • Fabrication of a planar array immunosensor on glass slides with antibody-functionalized wells.
  • Utilized a charge-coupled device (CCD) detector for quantitative image analysis.
  • Employed Cy5-labeled antibodies for toxin detection and a graded index of refraction lens array for focusing.

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Main Results:

  • Successfully detected staphylococcal enterotoxin B (SEB), ricin, and Yersinia pestis simultaneously.
  • Achieved low detection limits: 5 ng/mL for SEB, 25 ng/mL for ricin, and 15 ng/mL for pestis F1 antigen.
  • Demonstrated quantitative measurement of toxin concentrations through image analysis.

Conclusions:

  • The developed planar array immunosensor offers a sensitive and multiplexed platform for detecting multiple toxins.
  • This technology has potential applications in rapid diagnostics and threat detection.