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3D-Printed Microelectrodes for Biological Measurement.

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3D printing enables precise fabrication of novel microelectrodes using conductive thermoplastics like carbon black/polylactic acid and multiwall carbon nanotube/polylactic acid for biological monitoring.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Microelectrodes are crucial for spatial biological monitoring.
  • Carbon fiber is a common microelectrode material, but alternatives are sought.
  • 3D printing offers high precision for microelectrode fabrication.

Purpose of the Study:

  • To develop and evaluate 3D-printed microelectrodes using conductive thermoplastic materials.
  • To assess the performance of carbon black/polylactic acid (CB/PLA) and multiwall carbon nanotube/polylactic acid (MWCNT/PLA) microelectrodes.
  • To demonstrate the application of these microelectrodes in monitoring biological analytes.

Main Methods:

  • Fused filament fabrication was used to 3D print CB/PLA and MWCNT/PLA filaments into microelectrodes.
  • Microelectrodes with diameters ranging from 70 μm to 400 μm were fabricated.
  • Electrochemical performance was assessed using standard redox probes and serotonin (5-HT) detection.

Main Results:

  • MWCNT/PLA microelectrodes showed superior sensitivity, lower detection limits, and enhanced stability for 5-HT measurement.
  • Both CB/PLA and MWCNT/PLA microelectrodes successfully monitored 5-HT overflow from ex vivo ileum tissue.
  • Differences in 5-HT overflow from ileum and colon tissues were detected after spice odorant exposure using MWCNT/PLA microelectrodes.

Conclusions:

  • 3D printing provides a versatile platform for creating microelectrodes from various conductive thermoplastic materials.
  • This approach simplifies the manufacturing of custom microelectrodes for diverse electrochemical sensing applications.
  • MWCNT/PLA microelectrodes demonstrate significant potential for in situ biological monitoring, particularly for neurotransmitters like serotonin.