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NiO Nanoflowers for Non-Enzymatic Amperometric Detection of Glucose

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Published on: December 30, 2025

A glucose biosensor based on surface active maghemite nanoparticles.

Davide Baratella¹, Massimiliano Magro, Giulietta Sinigaglia

¹Department of Comparative Biomedicine and Food Science, University of Padua, Italy.

Biosensors & Bioelectronics

|March 5, 2013

Summary

This summary is machine-generated.

This study developed a novel maghemite nanoparticle-modified carbon paste electrode for detecting hydrogen peroxide and glucose. The biosensor demonstrates high sensitivity and stability, paving the way for reagentless biosensor devices.

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Area of Science:

Electrochemistry
Nanotechnology
Biosensors

Background:

Carbon paste electrodes modified with maghemite (γ-Fe2O3) nanoparticles (SAMNs) exhibit electrocatalytic activity for hydrogen peroxide reduction.
Ionic liquids can enhance the electrochemical properties of modified electrodes.

Purpose of the Study:

To develop a sensitive and stable biosensor for glucose detection.
To utilize maghemite nanoparticles as a platform for immobilizing enzymes and catalyzing electrochemical reactions.

Main Methods:

Fabrication of a carbon paste electrode modified with surface active maghemite nanoparticles (SAMNs) and ionic liquid (BMIM-PF6).
Immobilization of glucose oxidase onto maghemite nanoparticles using rhodamine B isothiocyanate as a linker.
Electrochemical characterization and performance evaluation of the developed biosensor for hydrogen peroxide and glucose detection.

Main Results:

The SAMN-BMIM-PF6-CP electrode showed high sensitivity (206.51 nA μM⁻¹cm⁻²) and a low detection limit (0.8 μM) for hydrogen peroxide.
The enzyme electrode exhibited a linear response to glucose (0-1.5 mM) with a sensitivity of 45.85 nA μM⁻¹cm⁻² and a detection limit of 0.9 μM.
The biosensor demonstrated good storage stability with a half-life of 2 months at 4°C.

Conclusions:

Surface active maghemite nanoparticles are effective electrocatalysts for hydrogen peroxide.
The developed maghemite nanoparticle-based biosensor is suitable for reagentless detection of glucose.
This approach offers a feasible route for constructing oxidase-based reagentless biosensor devices.