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A Single-Use, Self-Powered, Paper-Based Sensor Patch for Detection of Exercise-Induced Hypoglycemia.

Eunyoung Cho1, Maedeh Mohammadifar2, Seokheun Choi3

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Summary

This study presents a novel, self-powered wearable sensor patch for monitoring glucose in sweat, aiding in the prevention and management of exercise-induced hypoglycemia. The innovative biosensor requires no external power, offering a convenient solution for athletes.

Keywords:
enzymatic fuel cellexercise-induced hypoglycemiapaper-based deviceself-powered glucose sensorsweat sensor patch

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Biosensors

Background:

  • Exercise-induced hypoglycemia poses risks for athletes.
  • Current glucose monitoring methods can be invasive or inconvenient during exercise.
  • Need for non-invasive, self-powered monitoring solutions for sweat glucose.

Purpose of the Study:

  • To develop and characterize a paper-based, self-powered sensor patch for continuous glucose monitoring in human sweat.
  • To enable non-invasive management of exercise-induced hypoglycemia.
  • To demonstrate the feasibility of using enzymatic fuel cells for wearable biosensing.

Main Methods:

  • Fabrication of a vertically stacked, paper-based glucose/oxygen enzymatic fuel cell integrated into an adhesive patch.
  • Utilizing capillary forces to wick sweat to a microfluidic reservoir for energy conversion.
  • Employing direct electron transfer between glucose oxidase and anodes for enhanced performance.

Main Results:

  • The sensor patch demonstrated effective glucose monitoring in human sweat.
  • Achieved high linearity of current response across a clinically relevant glucose concentration range (0.02–1.0 mg/mL, R² = 0.989).
  • Exhibited high sensitivity (1.35 µA/mM) for glucose detection.

Conclusions:

  • The developed paper-based sensor patch is a viable, self-powered, non-invasive tool for sweat glucose monitoring.
  • This technology offers a promising approach for the prevention and management of exercise-induced hypoglycemia.
  • The wearable biosensor eliminates the need for external power sources and complex readout instruments.