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Electrochemical Microfluidic Multiplexed Bioanalysis by a Highly Active Bottlebrush-like Nanocarbon Microelectrode.

Yun Xu1, Wei Huang1, Yan Zhang2

  • 1Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

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|February 24, 2022
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Summary

This study introduces a novel nanocarbon microelectrode for highly sensitive, multichannel detection of multiple biomarkers in biological samples. This breakthrough enables precise point-of-care diagnostics using minimal bodily fluids.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Developing sensitive and selective biosensors is crucial for early disease diagnosis.
  • Existing methods often require large sample volumes and complex procedures.
  • Microfluidic devices offer miniaturization and high throughput for biological analysis.

Purpose of the Study:

  • To develop a highly efficient multichannel microfluidic electrochemical sensor.
  • To engineer a novel nanocarbon microelectrode for sensitive and selective multi-biomarker detection.
  • To demonstrate the sensor's application in analyzing biological samples for clinical diagnosis.

Main Methods:

  • Ionic liquid-assisted wet spinning and metal-organic framework growth for nanocarbon microfibers.
  • Pyrolysis treatment for structural and molecular engineering of the microelectrodes.
  • Fabrication of a flexible, bottlebrush-like nanocarbon microelectrode with N, B-codoped graphene and Co, N-codoped carbon nanotube arrays.

Main Results:

  • The nanocarbon microelectrode exhibited excellent electrochemical activity and mechanical robustness.
  • Density functional theory calculations confirmed a promoted electrocatalytic mechanism.
  • The sensor successfully detected hydrogen sulfide (H2S), dopamine (DA), uric acid (UA), and ascorbic acid (AA) in various biological samples, including live cells and body fluids.

Conclusions:

  • The developed bottlebrush nanocarbon electrodes are suitable for multichannel, microfluidic detection of redox-active biomolecules.
  • The sensor system shows significant potential for on-chip monitoring and point-of-care testing (POCT) in clinical diagnosis.
  • This technology offers a promising platform for sensitive and selective detection of multiple biomarkers in trace amounts of biological samples.