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Simple Continuous Glucose Monitoring in Freely Moving Mice
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A self-powered glucose biosensing system.

Gymama Slaughter1, Tanmay Kulkarni1

  • 1Bioelectronics Laboratory, Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.

Biosensors & Bioelectronics
|November 24, 2015
PubMed
Summary

This study developed a self-powered glucose biosensor using biofuel cells. The device generates electricity from glucose and can sense its concentration, offering potential for wearable technology.

Keywords:
Biofuel cellsPQQ-GDHSelf-powered glucose biosensor

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Area of Science:

  • Biomedical Engineering
  • Electrochemistry
  • Biosensors

Background:

  • Developing self-powered biosensors is crucial for continuous monitoring and wearable devices.
  • Glucose biofuel cells offer a promising avenue for generating sustainable power from biological analytes.

Purpose of the Study:

  • To fabricate and characterize a self-powered glucose biosensor (SPGS) system.
  • To evaluate the power generation and glucose sensing capabilities of the developed biosensor.
  • To assess the stability and dynamic range of the SPGS.

Main Methods:

  • Fabrication of bioelectrodes using a 3D multi-walled carbon nanotube network with redox enzymes (PQQ-GDH and laccase).
  • In vitro characterization of biofuel cell performance, including open circuit voltage, power density, and current density at varying glucose concentrations.
  • Monitoring capacitor charging frequencies for glucose sensing and assessing operational stability over 63 days.

Main Results:

  • The biofuel cell demonstrated significant power generation, achieving 67.86 µW/cm² at 45 mM glucose and 15.98 µW/cm² at 5 mM glucose.
  • A linear dynamic range of 0.5–45 mM glucose was observed for the biofuel cell assembly.
  • Capacitor charging frequencies provided a linear dynamic range of 0.5–35 mM glucose, with stable performance over 63 days.

Conclusions:

  • The developed SPGS system can simultaneously generate bioelectricity and sense glucose concentration.
  • The findings support the further investigation of glucose biofuel cells for self-powered biosensing applications.
  • The SPGS shows potential for powering ultra-low powered devices and enabling continuous glucose monitoring.