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Gel pad array chip for high throughput and multi-analyte microbead-based immunoassays.

Qingdi Zhu1, Dieter Trau2

  • 1Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore.

Biosensors & Bioelectronics
|December 3, 2014
PubMed
Summary

A novel gel pad array chip enables high-throughput, multi-analyte microbead immunoassays for cancer markers. This cost-effective, reusable chip offers sensitive detection and simultaneous analysis, benefiting common biolabs.

Keywords:
Gel-based microstructure arrayHigh throughput analysisImmunoassayMicrobead arrayMultiple analytes

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Area of Science:

  • Biotechnology
  • Assay Development
  • Microfluidics

Background:

  • Microbead-based immunoassays are crucial for detecting biomarkers.
  • High-throughput and multi-analyte detection methods are needed for efficient diagnostics.

Purpose of the Study:

  • To develop and validate a novel gel pad array chip for high-throughput, multi-analyte microbead immunoassays.
  • To demonstrate the chip's capability for quantitative detection of cancer biomarkers.

Main Methods:

  • Fabrication of a gel pad array chip using photo-patterning of polyacrylamide and polyethylene glycol (PEG) gels on a glass slide.
  • Immobilization of microbeads onto polyacrylamide gel pads surrounded by PEG micropillar rings.
  • Quantitative immunoassays for human chorionic gonadotropin (hCG) and prostate specific antigen (PSA) in serum samples.
  • Simultaneous detection using spatially encoded microbeads and single-filter fluorescence imaging.

Main Results:

  • Achieved detection limits below physiological threshold levels for cancer diagnosis.
  • Demonstrated good inter- and intra-chip reproducibility.
  • Successfully performed simultaneous detection of hCG and PSA on each gel pad array.

Conclusions:

  • The developed gel pad array chip is a cost-effective, reusable, and user-friendly tool for multi-analyte immunoassays.
  • This technology can empower common biolabs to customize their own microbead arrays for various diagnostic applications.