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Microchip-based electrochemical detection using a 3-D printed wall-jet electrode device.

Akash S Munshi1, R Scott Martin

  • 1Department of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, MO 63103, USA. martinrs@slu.edu.

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|December 10, 2015
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Summary
This summary is machine-generated.

Three-dimensional (3-D) printing enables novel wall-jet electrode (WJE) microfluidic devices. These 3-D printed devices offer enhanced sensitivity and lower detection limits compared to traditional thin-layer electrodes (TLEs) for electrochemical analysis.

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Area of Science:

  • Electrochemistry
  • Microfluidics
  • 3D Printing Technology

Background:

  • Three-dimensional (3-D) printing offers advantages for fabricating microfluidic devices, including ease of production, reproducibility, and potential for integrated electrochemical detection.
  • Traditional microfluidic fabrication methods can be complex and limit electrode integration and reusability.

Purpose of the Study:

  • To introduce and evaluate a novel wall-jet electrode (WJE) configuration for microfluidic devices fabricated using 3-D printing.
  • To compare the analytical performance of the 3-D printed WJE design against the conventional thin-layer electrode (TLE) design.

Main Methods:

  • Fabrication of microfluidic devices with an integrated wall-jet electrode (WJE) configuration using 3-D printing technology.
  • Comparative analysis using microchip-based flow injection analysis, evaluating sensitivity and limit of detection with platinum and glassy carbon electrodes.
  • Demonstration of the 3-D printed WJE as an inexpensive electrochemical detector for High-Performance Liquid Chromatography (HPLC).

Main Results:

  • The optimized 3-D printed WJE design demonstrated significantly enhanced analytical performance compared to the TLE design.
  • Using a 500 μm platinum electrode, the WJE exhibited 16 times higher calibration sensitivity than the TLE.
  • A limit of detection of 500 nM for catechol was achieved with the WJE using a 1 mm glassy carbon electrode, a substantial improvement over the TLE's 6 μM.

Conclusions:

  • 3-D printing is a powerful tool for creating reusable, integrated microfluidic electrochemical detectors with novel configurations.
  • The WJE approach fabricated via 3-D printing offers superior sensitivity and detection limits for microfluidic electrochemical analyses.
  • The 3-D printed WJE serves as an effective and inexpensive electrochemical detector for HPLC, comparable to commercial detectors.