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Paper-Based Microfluidic Devices: Low-Cost Platforms for Rapid Biochemical Detection.

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Military Medicine
|January 27, 2021
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Summary

We developed low-cost, portable paper diagnostic devices for rapid detection of human immunoglobulin M (IgM) and immunoglobulin G (IgG) in serum. These devices offer sensitive, specific, and stable results, paving the way for widespread disease diagnosis.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Point-of-Care Diagnostics

Background:

  • Current diagnostic methods for immunoglobulin M (IgM) and immunoglobulin G (IgG) often require complex laboratory equipment and trained personnel.
  • There is a need for rapid, low-cost, and accessible diagnostic tools, especially for use in resource-limited settings.
  • Paper-based diagnostics offer a promising platform for portable and disposable medical devices.

Purpose of the Study:

  • To develop and validate a novel, low-cost, paper-based diagnostic device for the simultaneous detection of human IgM and IgG in serum.
  • To achieve rapid, sensitive, and specific detection of these biomarkers without the need for sample preparation.
  • To assess the device's performance, including its stability, ruggedness, and suitability for use by untrained personnel in diverse environments.

Main Methods:

  • Development of a microfluidic paper device utilizing a vertical flow immunoassay configuration.
  • Colorimetric detection of IgM and IgG using gold nanoparticle-conjugated antibodies.
  • Quantification of colorimetric signals via image analysis software, adaptable for smartphone applications.
  • Evaluation of device sensitivity, dynamic range, and stability under various temperature and time conditions.

Main Results:

  • Successful colorimetric detection of human IgG at concentrations as low as 100 fg/mL.
  • The platform demonstrated a wide dynamic range for both IgM and IgG (0.1 pg/mL to 100 μg/mL).
  • Results were obtained in under 5 minutes using only 20 µL of serum, with high stability at elevated temperatures (50°C for 14 days) and long shelf-life (up to 180 days).

Conclusions:

  • The developed paper-based diagnostic device offers a simple, sensitive, and reliable method for detecting human IgM and IgG.
  • Its low cost, portability, ease of use, and multiplexing capability make it suitable for widespread disease diagnosis, including in austere environments.
  • This technology has the potential to become a standard for disease diagnosis due to its high sensitivity, specificity, and overall robustness.