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Boron Doped Diamond Paste Electrodes for Microfluidic Paper-Based Analytical Devices.

Siriwan Nantaphol1, Robert B Channon2, Takeshi Kondo3

  • 1Department of Chemistry, Faculty of Science, Chulalongkorn University , Patumwan, Bangkok 10330, Thailand.

Analytical Chemistry
|March 7, 2017
PubMed
Summary

Boron doped diamond paste electrodes (BDDPEs) integrated with microfluidic paper-based analytical devices (μPADs) offer a low-cost, high-performance electrochemical sensor. This novel BDDPE-μPAD system effectively detects biological species and heavy metals, showing promise for point-of-care diagnostics.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • High-quality Boron doped diamond (BDD) electrodes possess excellent electrochemical properties but face limitations in cost and availability.
  • Traditional carbon paste electrodes (CPEs) are widely used but can suffer from fouling and limited performance.
  • Microfluidic paper-based analytical devices (μPADs) offer a low-cost platform for portable sensing applications.

Purpose of the Study:

  • To develop a low-cost, high-performance electrochemical sensor by combining Boron doped diamond paste electrodes (BDDPEs) with microfluidic paper-based analytical devices (μPADs).
  • To demonstrate the effectiveness of BDDPEs for detecting biological species and heavy metals in a μPAD format.
  • To compare the performance of BDDPEs with traditional carbon paste electrodes (CPEs).

Main Methods:

  • Preparation of Boron doped diamond paste electrodes (BDDPEs) using a mixture of BDD powder and mineral oil.
  • Stencil-printing of BDDPEs into various electrode geometries on μPADs.
  • Electrochemical detection of biological species (norepinephrine, serotonin) and heavy metals (Pb, Cd) using the BDDPE-μPAD system.
  • Performance comparison between BDDPEs and conventional carbon paste electrodes (CPEs).

Main Results:

  • BDDPEs were successfully fabricated and integrated with μPADs, creating an easily prepared, stencil-printable electrochemical sensor.
  • The BDDPE-μPAD system demonstrated effective detection of norepinephrine, serotonin, lead (Pb), and cadmium (Cd).
  • Compared to CPEs, BDDPEs exhibited a wider potential window, reduced capacitive current, and prevented serotonin fouling.

Conclusions:

  • Boron doped diamond paste electrodes (BDDPEs) coupled with microfluidic paper-based analytical devices (μPADs) provide a viable low-cost, high-performance electrochemical sensing platform.
  • The BDDPE-μPAD system shows significant potential for sensitive and reliable detection of various analytes.
  • This approach is well-suited for developing portable, point-of-care diagnostic sensors.