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Related Experiment Video

Updated: Oct 17, 2025

Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays
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Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays

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Sink/Float Magnetic Immunoassays for In-Field Bioassays.

Parthena Chorti1, Dionysios C Christodouleas1

  • 1Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, MA, 01854, USA.

Angewandte Chemie (International Ed. in English)
|October 14, 2021
PubMed
Summary

This study introduces sink/float magnetic immunoassays, a simple, instrument-free method for detecting biomarkers in biological samples. These rapid tests offer a potential solution for field diagnostics, meeting regulatory requirements for ease of use.

Keywords:
density-based assaysmagnetic immunoassayssink/float magnetic immunoassayssink/float tests

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Last Updated: Oct 17, 2025

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Area of Science:

  • Biomarker detection
  • Immunodiagnostics
  • Point-of-care testing

Background:

  • Regulatory bodies require simple analytical protocols for non-laboratory diagnostic devices.
  • Field-deployable diagnostic tests need to be user-friendly and instrument-free.

Purpose of the Study:

  • To describe the theory and proof-of-concept for sink/float magnetic immunoassays.
  • To evaluate the potential of these assays for detecting biomarkers in untreated biological samples.

Main Methods:

  • Development of sink/float magnetic immunoassays utilizing superparamagnetic nanoparticles and reporter antibodies.
  • Demonstration of a mix-and-observe, instrument-free assay protocol.
  • Application of the assay for detecting C-Reactive Protein, anti-Treponema pallidum antibodies, and E. coli bacteria.

Main Results:

  • Sink/float magnetic immunoassays provide results within 25-45 minutes.
  • Assay performance is based on the sinking or floating of a magnetic nanoparticle-functionalized sphere.
  • Proof-of-concept demonstrated for detecting various analytes, including proteins, antibodies, and bacteria.

Conclusions:

  • Sink/float magnetic immunoassays are a novel, rapid, and instrument-free method for biomarker detection.
  • The simplicity of the assay protocol may meet regulatory criteria for field use.
  • These assays show promise for point-of-care diagnostics in diverse applications.