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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Published on: June 1, 2012

Microneedle array-based carbon paste amperometric sensors and biosensors.

Joshua Ray Windmiller¹, Nandi Zhou, Min-Chieh Chuang

¹Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0448, USA.

|March 18, 2011

Summary

This study introduces microneedle array electrodes for minimally invasive electrochemical sensing. These novel devices offer repeatable and stable detection of analytes like lactate, paving the way for in-body monitoring.

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Area of Science:

Electrochemistry
Materials Science
Biomedical Engineering

Background:

Microneedle arrays offer minimally invasive access for electrochemical sensing.
Carbon paste electrodes are versatile and renewable transducer platforms.

Purpose of the Study:

To design and characterize a microneedle array-based carbon paste electrode for electrochemical sensing.
To evaluate the performance of the microneedle array for detecting hydrogen peroxide and lactate.

Main Methods:

Fabrication of 3x3 microneedle arrays with metallized carbon paste transducers.
Surface characterization using optical and scanning electron microscopy.
In vitro electrochemical detection of hydrogen peroxide and lactate biosensing.

Main Results:

Achieved good microelectrode uniformity and repeatable sensing after repacking.
Demonstrated stable operation and interference-free detection of lactate in complex biological samples.
Successfully detected hydrogen peroxide at rhodium-dispersed carbon paste microneedles.

Conclusions:

The microneedle array carbon paste electrode is a promising platform for minimally invasive electrochemical sensing.
The renewable nature and stability of the electrodes support potential for subcutaneous analyte monitoring.
Further development to address biofouling could enhance its utility for continuous on-body sensing.