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Related Experiment Video

Updated: Jun 4, 2026

Simultaneous Detection of Different Antibody Classes in a Multiplexed Serological Test
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Published on: July 14, 2023

Development of a novel single sensor multiplexed marker assay.

Jeffrey T La Belle1, Ugur Korcan Demirok, Dharmendra R Patel

  • 1Harrington Bioengineering Program , School of Biological Health and Systems Engineering and the Biodesign Institute, Arizona State University, 550 East Orange St., Tempe, AZ 85287-9709, USA. JEFFREY.LABELLE@asu.edu

The Analyst
|February 4, 2011
PubMed
Summary

This study developed a novel biosensor using electrochemical impedance spectroscopy to rapidly detect inflammatory markers like interleukin-12 and tumor necrosis factor-α. The sensor achieves distinct frequency responses for multiplexed detection without compromising sensitivity.

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Electrochemical Analysis

Background:

  • Increasing demand for simultaneous measurement of multiple analytes for disease management.
  • Need for rapid, label-free detection from small samples, similar to self-monitoring blood glucose.
  • Limitations of current methods requiring additional steps, arrays, or reagents.

Purpose of the Study:

  • To develop a biosensor capable of rapid, simultaneous detection of multiple analytes.
  • To utilize electrochemical impedance spectroscopy (EIS) for label-free analyte detection.
  • To tune antibody-functionalized gold nanoparticles for distinct frequency responses of inflammatory markers.

Main Methods:

  • Functionalization of gold nanoparticles with antibodies against interleukin-12 (IL-12) and tumor necrosis factor-α (TNF-α).
  • Immobilization of functionalized nanoparticles onto an EIS-based biosensor platform.
  • Verification of antibody specificity and cross-reactivity using ELISA.
  • Quantification of impedance frequency shifts in response to varying analyte concentrations.

Main Results:

  • Successful tuning of the natural impedance frequency for IL-12 (5.00 Hz) and TNF-α to distinct, separated frequencies (4 Hz difference) for improved signal processing.
  • Maintained low limits of detection (<4 pg/mL for IL-12, ~60 pg/mL for TNF-α) without significant alteration.
  • Demonstrated no cross-reactivity and high specificity for the targeted analytes, confirmed by ELISA.

Conclusions:

  • The developed EIS biosensor effectively differentiates between IL-12 and TNF-α through distinct impedance frequency shifts.
  • This approach offers potential for label-free, rapid, and multiplexed detection of disease biomarkers.
  • Future modeling and development could enable enhanced tuning for more complex multiplexed sensing applications, potentially aiding in conditions like diabetes management.