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Picomolar Detection of Hydrogen Peroxide using Enzyme-free Inorganic Nanoparticle-based Sensor
Craig J Neal1, Ankur Gupta1, Swetha Barkam1
1Advanced Materials Processing and Analysis Center, Materials Science & Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA.
Scientific Reports
|May 4, 2017
Summary
This study introduces an enzyme-free biosensor using cerium oxide nanoparticles (CNPs) for ultra-low detection of disease markers. The novel CNP biosensor shows high sensitivity and robustness in various conditions, aiding early disease detection.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Electrochemistry
Background:
- Biomedical science is shifting towards early disease detection and prevention.
- Ceria nanoparticles (CNPs) possess redox properties (Ce3+ ↔ Ce4+) beneficial for neutralizing free radicals linked to diseases like cancer and neurodegenerative disorders.
Purpose of the Study:
- To investigate the electrochemical response of cerium oxide nanoparticles (CNPs) with varying Ce3+:Ce4+ ratios in the presence of hydrogen peroxide.
- To develop an enzyme-free CNP-based biosensor for ultra-low level detection of analytes.
Main Methods:
- Preparation and electrochemical analysis (cyclic voltammetry, chronoamperometry) of CNPs with different Ce3+:Ce4+ ratios.
- Design and testing of a CNP-based biosensor platform.
- Evaluation of sensor performance across various pH levels, temperatures, and in blood serum.
Main Results:
- An increasing Ce4+ to Ce3+ ratio in CNPs correlated with a greater electrochemical response.
- An enzyme-free CNP biosensor achieved ultra-low detection limits (limit of quantitation: 0.1 pM).
- The biosensor demonstrated consistent sensitivity and robustness across different pH, temperature, and in blood serum.
Conclusions:
- The developed CNP-based biosensor offers a sensitive, selective, and robust platform for early disease detection.
- Its ability to function in diverse conditions, including biological fluids, highlights its potential as an implantable biomedical device.
