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Mediated amperometric immunosensing using single walled carbon nanotube forests
Máire O'Connor1, Sang Nyon Kim, Anthony J Killard
1National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland.
The Analyst
|November 27, 2004
Summary
This study introduces a novel amperometric immunosensor using single-wall carbon nanotube (SWNT) forests for sensitive biotin detection. The SWNT-based biosensor demonstrates high performance for nano-biosensing applications.
Area of Science:
- Nanotechnology
- Biosensors
- Electrochemistry
Background:
- Single-wall carbon nanotube (SWNT) forests offer high surface area and conductivity for biosensor development.
- Perpendicularly oriented SWNT assemblies can enhance antibody adsorption and sensor performance.
Purpose of the Study:
- To evaluate a prototype amperometric immunosensor based on SWNT forests for detecting biotin.
- To characterize the adsorption of antibodies onto SWNT forests and assess sensor sensitivity and specificity.
Main Methods:
- Self-assembly of oxidatively shortened SWNTs onto modified electrodes to create SWNT forests.
- Characterization of SWNT forests using atomic force microscopy and resonance Raman spectroscopy.
- Amperometric detection of biotin using an anti-biotin antibody immobilized on SWNT forests.
Main Results:
- Anti-biotin antibody strongly adsorbed to the SWNT forests.
- Detection limit of 2.5 nM for horseradish peroxidase (HRP)-labeled biotin in the presence of a mediator.
- Detection limit of 16 µM for unlabeled biotin in a competitive assay with 12% relative standard deviation.
- Low non-specific adsorption (approx. 0.1%) of biotin-HRP when blocked with bovine serum albumin.
Conclusions:
- The developed immunosensor demonstrates sensitive and specific biotin detection.
- SWNT forest assemblies provide a promising platform for nano-biosensing arrays.
- This approach may be valuable for developing advanced biosensing technologies.