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Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor
Published on: March 21, 2018
Conducting polymer-based impedimetric aptamer biosensor for in situ detection.
Wei Liao1, Brad A Randall, Nicolas A Alba
1Department of Bioengineering, University of Pittsburgh, 5063 Bioscience Tower 3, 3501 Fifth Ave, Pittsburgh, PA 15260, USA.
Analytical and Bioanalytical Chemistry
|September 12, 2008
Summary
Researchers created a novel electrochemical biosensor using polypyrrole and aptamers. This biosensor demonstrates high specificity and sensitivity for detecting protein targets like platelet-derived growth factor and immunoglobulin E.
Area of Science:
- Biotechnology
- Biosensor Technology
- Electrochemistry
Background:
- Protein biosensors are crucial for diagnostics.
- Developing sensitive and specific detection methods remains a challenge.
- Conducting polymers offer promising platforms for biosensor development.
Purpose of the Study:
- To develop the first prototype of an electrochemical protein biosensor.
- To utilize polypyrrole as a substrate and doped aptamer as a probe.
- To assess the sensor's sensitivity, specificity, and response to target concentration.
Main Methods:
- Fabrication of an electrochemical biosensor using polypyrrole substrate.
- Immobilization of doped aptamers as recognition elements.
- Testing the biosensor's performance with specific protein targets (platelet-derived growth factor and immunoglobulin E).
- Quantification of sensitivity and evaluation of specificity.
Main Results:
- The developed biosensor demonstrated a sensitivity of 10 ng/ml for a specific target.
- High specificity was observed for both platelet-derived growth factor and immunoglobulin E.
- A direct correlation was found between increased target concentration and signal output.
Conclusions:
- The polypyrrole-based aptasensor represents a successful prototype for electrochemical protein detection.
- The sensor exhibits excellent specificity and sensitivity, paving the way for advanced diagnostic tools.
- This technology holds potential for sensitive and specific quantification of various protein biomarkers.
