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Capillary Electrophoresis: Instrumentation01:20

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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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Selective electrochemical detection using a split disk array electrode in a thin-layer radial flow system.

Y Iwasaki1, O Niwa, M Morita

  • 1NTT Basic Research Laboratories, 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-01, Japan, NTT Advance Technology, Tokai, Ibaraki 319-11, Japan, and Bioanalytical Systems Inc., 2701 Kent Avenue, West Lafayette, Indiana 47906.

Analytical Chemistry
|May 31, 2011
PubMed
Summary
This summary is machine-generated.

A novel eight-sector array electrode enables precise amperometric detection at low flow rates. This electrochemical detector accurately determines redox species ratios, crucial for sensitive analytical applications.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Amperometric detectors require precise electrode design for accurate low flow rate analysis.
  • Existing systems face challenges with electrochemical interference and reproducibility at low flow rates.

Purpose of the Study:

  • To design and fabricate a novel eight-sector array (split disk) electrode for low flow rate amperometric detection.
  • To evaluate the performance of this electrode in a thin-layer radial flow cell for electrochemical analysis.
  • To demonstrate its capability in determining the ratio of redox species with high accuracy.

Main Methods:

  • Photolithographic fabrication of an eight-sector pie-shaped electrode array.
  • Integration with a thin-layer radial flow cell for electrochemical measurements.
  • Performance evaluation using coulometric hydrodynamic voltammetry of reversible redox species.

Main Results:

  • Achieved 94% conversion efficiency at a flow rate of 0.01 mL/min.
  • Demonstrated independence of electrode sectors from cross-electrochemical reactions.
  • Obtained Nernstian curves for reversible redox species, enabling accurate ratio determination.
  • Successfully determined redox species ratios with a small injection volume (5 μL).

Conclusions:

  • The designed eight-sector array electrode offers high dimensional accuracy and reproducibility.
  • The system effectively minimizes electrochemical interference, enhancing detection sensitivity.
  • This electrochemical detector is suitable for precise quantitative analysis of redox species ratios at low flow rates.