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Electrochemiluminescence detection in microfluidic cloth-based analytical devices.

Wenrong Guan1, Min Liu1, Chunsun Zhang1

  • 1MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.

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This study introduces novel microfluidic cloth-based analytical devices (μCADs) with electrochemiluminescence (ECL) detection. These disposable sensors offer a low-cost, portable solution for sensitive chemical analysis in various settings.

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Area of Science:

  • Analytical Chemistry
  • Biosensors
  • Materials Science

Background:

  • Microfluidic cloth-based analytical devices (μCADs) offer potential for low-cost diagnostics.
  • Electrochemical luminescence (ECL) provides sensitive detection methods.
  • Integrating μCADs with ECL can enhance portable sensing capabilities.

Purpose of the Study:

  • To develop and demonstrate the first microfluidic cloth-based analytical devices (μCADs) combined with electrochemiluminescence (ECL) detection.
  • To evaluate the performance of these μCADs for quantitative analysis of specific analytes.
  • To explore the potential of this integrated platform for point-of-care testing and remote monitoring.

Main Methods:

  • Fabrication of μCADs using wax screen-printing on cloth with integrated carbon screen-printed electrodes (SPEs).
  • Application of two common ECL systems: tris(2,2'-bipyridyl)ruthenium(II)/tri-n-propylamine (Ru(bpy)3(2+)/TPA) and 3-aminophthalhydrazide/hydrogen peroxide (luminol/H2O2).
  • Quantitative determination of TPA, H2O2, and glucose in buffer and artificial urine samples using a portable charge-coupled device (CCD) imaging system.

Main Results:

  • Successful quantitative determination of TPA with a linear range of 2.5–2500 μM and a detection limit of 1.265 μM.
  • Detection of H2O2 in the linear range of 0.05–2.0 mM with a detection limit of 0.027 mM.
  • Demonstrated acceptable sensitivity, stability, and reproducibility for ECL emission on the cloth device, with glucose detection limits of 0.032 mM in PBS and 0.038 mM in artificial urine.

Conclusions:

  • The developed ECL μCADs are disposable, simple, and inexpensive, suitable for portable detection.
  • The platform shows promise for sensitive and reliable quantitative analysis of various analytes.
  • ECL μCADs represent a new sensing platform for point-of-care testing, public health, food safety, and environmental monitoring.