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Multiplexed homogeneous digital immunoassay based on single-particle motion analysis.

Kenji Akama1, Hiroyuki Noji

  • 1Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. hnoji@appchem.t.u-tokyo.ac.jp.

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Summary

We developed a multiplexed digital immunoassay for sensitive protein detection. This novel method analyzes single-particle motion to simultaneously measure multiple biomarkers with high accuracy.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Immunology

Background:

  • Homogeneous digital immunoassays offer sensitive protein biomarker detection.
  • Current methods lack multiplexing capabilities, limiting simultaneous analysis.
  • Multiplexed immunoassays are crucial for complex diagnostics.

Purpose of the Study:

  • To develop a multiplexed homogeneous digital immunoassay.
  • To enable simultaneous detection of multiple protein biomarkers.
  • To enhance sensitivity and performance in biomarker analysis.

Main Methods:

  • Developed a digital homogeneous non-enzyme-linked immunosorbent assay (digital Ho-Non ELISA) using single-particle motion analysis.
  • Utilized magnetic nanobeads labeled with fluorescent dyes and capture antibodies.
  • Employed femtoliter-sized reactors with surface-anchored detection antibodies for antigen capture.
  • Analyzed Brownian motion of tethered beads for target identification and quantification.

Main Results:

  • Successfully multiplexed homogeneous digital immunoassay for simultaneous detection of PSA and IL6.
  • Achieved higher sensitivity compared to previous single-target digital Ho-Non ELISA.
  • Demonstrated simultaneous multi-target detection with performance equivalent to single-plex assays.
  • Confirmed target identification via bead color and concentration via tethered bead count.

Conclusions:

  • The developed digital Ho-Non ELISA enables sensitive, multiplexed protein biomarker detection.
  • This strategy enhances antigen-antibody binding efficiency through magnetic force and physical compartmentalization.
  • The method shows significant potential for next-generation in vitro diagnostics and biomarker discovery.