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Design considerations for reducing sample loss in microfluidic paper-based analytical devices.

Michael P Nguyen1, Nathan A Meredith2, Sydney P Kelly1

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States.

Analytica Chimica Acta
|March 15, 2018
PubMed
Summary
This summary is machine-generated.

Analyte loss in microfluidic paper-based analytical devices (microPADs) limits sensitivity. Simple modifications like adding waste zones and elution steps significantly improve Ni(II) and Mn(II) detection in these portable analytical tools.

Keywords:
Colorimetric detectionDevice fabricationMicrofluidic paper-based analytical device (μPAD)Sample lossWax printing

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Microfluidic paper-based analytical devices (microPADs) offer portable, low-cost analysis but often lack the sensitivity for environmental applications.
  • Analyte loss to the device material is a key limitation, reducing the effectiveness of microPADs.
  • Significant loss (≥50%) of Ni(II) was observed in standard 30 mm paper channels, highlighting the need for optimization.

Purpose of the Study:

  • To investigate and implement strategies to mitigate analyte loss and enhance the sensitivity of microPADs.
  • To improve the performance of microPADs for environmental monitoring applications.

Main Methods:

  • Investigated strategies including adding a waste zone, enlarging the detection zone, and incorporating an elution step.
  • Optimized microPAD design by combining the most effective performance-enhancing functionalities.
  • Tested the optimized microPAD with Ni(II) and Mn(II) samples to evaluate improvements.

Main Results:

  • A microPAD incorporating optimized functionalities demonstrated a 78% increase in maximum signal and a 28% increase in sensitivity for Ni(II) transport.
  • The optimized microPAD also achieved a 94% increase in maximum signal for Mn(II) samples.
  • These results indicate the general applicability of the developed strategies for improving microPAD performance.

Conclusions:

  • Simple modifications can overcome critical analyte loss issues in microPADs.
  • Optimized microPADs show enhanced sensitivity and signal, making them more suitable for demanding environmental analyses.
  • The developed strategies offer a pathway to broader adoption of microPAD technology in sensitive detection applications.