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NiO Nanoflowers for Non-Enzymatic Amperometric Detection of Glucose
Published on: December 30, 2025
Engineering the interface between glucose oxidase and nanoparticles.
Edurne Tellechea1, Kenneth J Wilson, Ernesto Bravo
1Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 25, 2012
Summary
Glucose oxidase (GOx) enzyme activity and structure are negatively affected by binding to gold nanoparticles (NPs). While surface chemistry and microenvironment can mitigate damage, stabilizing proteins worsen activity, and unfolding is often irreversible.
Area of Science:
- Biochemistry
- Nanotechnology
- Enzyme Kinetics
Background:
- Glucose oxidase (GOx) is crucial for biosensors.
- Understanding enzyme behavior on nanomaterials like gold nanoparticles (NPs) is vital for optimizing device performance.
- The impact of NP conjugation on enzyme structure and activity requires detailed investigation.
Purpose of the Study:
- To investigate how gold nanoparticle (NP) surface chemistry, stabilizing proteins, and microenvironment affect glucose oxidase (GOx) behavior.
- To assess the structural and activity changes of GOx upon conjugation to NPs and after displacement.
- To determine the reversibility of GOx-NP interactions.
Main Methods:
- Circular dichroism (CD) spectroscopy and fluorescence were used to probe GOx secondary structure and unfolding.
- Colorimetric assays measured GOx enzymatic activity.
- GOx activity and structure were examined after displacement from the NP surface.
Main Results:
- Conjugation to gold nanoparticles (NPs) generally impaired glucose oxidase (GOx) behavior.
- NP surface chemistry and protein microenvironment influenced the extent of this impairment.
- Stabilizing protein additives negatively affected GOx activity.
- GOx often remained unfolded after displacement from NPs, indicating irreversible interactions.
Conclusions:
- Gold nanoparticle (NP) conjugation can irreversibly alter glucose oxidase (GOx) structure and reduce its activity.
- Optimizing NP surface chemistry and microenvironment is key to preserving GOx function.
- Stabilizing proteins may not be beneficial and can even be detrimental to GOx activity on NPs.
