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High-performance low-cost antibody microarrays using enzyme-mediated silver amplification.

Gina Zhou1,2, Sebastien Bergeron1,2, David Juncker1,2,3

  • 1†Department of Biomedical Engineering, McGill University, Room 316, Duff Medical Building, 3775, rue University, Montréal, QC H3A 2B4, Canada.

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|February 11, 2015
PubMed
Summary

A new silver-enhanced immunoassay (SENSIA) offers a low-cost, high-sensitivity alternative to fluorescence scanners for antibody microarrays. This method enables multiplex protein detection in clinical settings with excellent performance.

Keywords:
and flatbed scannerantibody microarrayenzyme-mediated silver precipitationhigh-sensitivity assaymultiplex assaysignal amplification

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Immunotechnology

Background:

  • Conventional fluorescence scanners for antibody microarrays are expensive and bulky, limiting clinical use.
  • Multiplex protein detection is crucial for various diagnostic and research applications.

Purpose of the Study:

  • To develop and validate a cost-effective, high-sensitivity multiplex immunoassay using silver enhancement for antibody microarrays.
  • To compare the performance of the novel assay with traditional fluorescence-based methods.

Main Methods:

  • Developed a 15-plex enzyme-mediated silver enhanced sandwich immunoassay (SENSIA) on a microarray.
  • Optimized HRP-mediated silver amplification and evaluated flatbed scanners for quantification.
  • Compared SENSIA with fluorescence assays for 15 proteins, analyzing limits of detection (LODs) and dynamic ranges (DRs).
  • Validated the assay using spiked proteins in diluted serum.

Main Results:

  • SENSIA achieved LODs in the pg/mL range for all 15 proteins, with 12 below 10 pg/mL.
  • LODs and DRs were comparable to fluorescence assays for most proteins.
  • Good agreement (R(2) > 0.9) was observed between SENSIA and fluorescence detection in a complex serum matrix.

Conclusions:

  • SENSIA provides a low-cost, high-sensitivity alternative for multiplex immunoassays.
  • The combination of silver enhancement and consumer electronics enables accessible clinical applications.
  • This technology has the potential to significantly advance point-of-care diagnostics.