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Updated: May 22, 2026
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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
Published on: February 16, 2018
The biochemiresistor: an ultrasensitive biosensor for small organic molecules
Leo M H Lai1, Ian Y Goon, Kyloon Chuah
1School of Chemistry and the Australian Centre for NanoMedicine, University of New South Wales, Sydney, NSW 2052, Australia.
Angewandte Chemie (International Ed. in English)
|May 29, 2012
Summary
A novel biosensor detects antibiotic concentrations using magnetic nanoparticles functionalized with enrofloxacin. This resistance-based sensor offers a new method for quantifying specific analytes with high sensitivity.
Area of Science:
- Nanotechnology
- Biosensing
- Analytical Chemistry
Background:
- Antibiotic resistance necessitates sensitive detection methods.
- Magnetic nanoparticles offer unique properties for biosensing applications.
- Enrofloxacin is a widely used veterinary antibiotic.
Purpose of the Study:
- To develop a novel resistance-based biosensor for enrofloxacin detection.
- To functionalize gold-coated magnetic nanoparticles (Au@MNPs) with enrofloxacin.
- To investigate the magnetic assembly of Au@MNPs for signal transduction.
Main Methods:
- Fabrication of Au@MNPs functionalized with enrofloxacin.
- Magnetic assembly of functionalized Au@MNPs between electrodes.
- Measurement of electrical resistance as a function of analyte concentration.
Main Results:
- The developed biosensor demonstrated a measurable resistance change upon binding of anti-enrofloxacin analyte.
- The measured resistance (R) was found to be directly related to the analyte concentration.
- Successful magnetic assembly of Au@MNPs between electrodes was achieved.
Conclusions:
- A novel and sensitive resistance-based biosensor utilizing functionalized Au@MNPs has been successfully developed.
- The biosensor shows promise for the quantitative detection of enrofloxacin and potentially other analytes.
- Magnetic assembly offers an effective strategy for integrating nanoparticles into biosensing platforms.
