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The first electrochemical MIP sensor for tamoxifen
Aysu Yarman1, Frieder W Scheller2
1Fraunhofer Institute for Biomedical Engineering IBMT, Am Mühlenberg 13, 14476 Potsdam, Germany. yarman@uni-potsdam.de.
Sensors (Basel, Switzerland)
|April 30, 2014
Summary
We developed a novel electrochemical sensor using molecularly imprinted polymers (MIPs) for sensitive tamoxifen detection. This MIP sensor offers selective and reliable quantification of tamoxifen, a crucial nonsteroidal anti-estrogen.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Tamoxifen (TAM) is a vital nonsteroidal anti-estrogen drug.
- Existing methods for TAM detection, primarily bulk MIPs for chromatography, have limitations.
- Development of selective and sensitive electrochemical sensors for TAM is needed.
Purpose of the Study:
- To develop a novel electrochemical sensor for tamoxifen detection.
- To utilize electropolymerization of O-phenylenediamine-resorcinol in the presence of TAM to create a molecularly imprinted polymer (MIP).
- To evaluate the sensor's performance, including sensitivity, selectivity, and potential interferences.
Main Methods:
- Electropolymerization of O-phenylenediamine-resorcinol on an electrode surface with TAM as the template molecule.
- Electrochemical detection using ferricyanide redox probe to assess MIP cavity binding.
- Linear sweep voltammetry to determine TAM concentration.
- Testing selectivity against TAM metabolite and doxorubicin.
Main Results:
- The MIP sensor effectively suppressed ferricyanide reduction, with signal recovery upon template removal and re-suppression upon rebinding.
- A linear relationship was observed between TAM concentration (1-100 nM) and the decrease in ferricyanide peak.
- The sensor exhibited 2.3 times higher recognition for TAM compared to 4-hydroxytamoxifen and no cross-reactivity with doxorubicin.
- A method to circumvent polymer formation and electrochemical interferences using TAM pre-treatment with peroxide and HRP was demonstrated.
Conclusions:
- An effective electrochemical MIP sensor for tamoxifen detection was successfully developed.
- The sensor demonstrates high sensitivity, selectivity, and potential for real-world applications.
- The developed method provides a promising alternative for tamoxifen monitoring.
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