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Strategies for developing NADH detectors based on Meldola Blue and screen-printed electrodes: a comparative study
Alina Vasilescu1, Thierry Noguer, Silvana Andreescu
1Monitoring and Quality Control Laboratory, Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 1, Romania.
Talanta
|October 31, 2008
Summary
Screen-printed amperometric detectors for NADH were developed using three methods. Electropolymerized Meldola Blue (MB) offered the best stability and detection limit for NADH sensing.
Area of Science:
- Electrochemistry
- Biosensors
- Materials Science
Background:
- Screen-printed electrodes are widely used for electrochemical sensing.
- Meldola Blue (MB) is a known mediator for NADH detection.
- Optimizing mediator incorporation is crucial for sensor performance.
Purpose of the Study:
- To compare three strategies for producing screen-printed amperometric detectors for NADH.
- To evaluate the performance of detectors based on Meldola Blue (MB), MB-Reinecke salt (MBRS), and poly(MB).
- To highlight fabrication-induced characteristics of screen-printed electrodes.
Main Methods:
- Screen-printing of graphite electrodes.
- Incorporation of Meldola Blue (MB) directly into ink.
- Incorporation of MB-Reinecke salt (MBRS) into graphite ink.
- Electrodeposition of poly(MB) films on electrode surfaces.
- Electrochemical characterization using cyclic voltammetry and amperometry.
Main Results:
- Mediators exhibited formal potentials (E degrees ') between -0.129 to -0.160 V vs. Ag/AgCl and pK(a)s of 5.09-6.02.
- A secondary redox couple at E degrees '=-0.450 V vs. Ag/AgCl was observed for poly(MB) and aged electrodes.
- Electropolymerized MB (poly(MB)) yielded the best operational stability and a detection limit of 2 x 10(-6) M.
- MBRS-modified sensors showed the widest linear range from 1 x 10(-5) to 7.5 x 10(-4) M.
- Comparison with a commercial NADH detector was performed.
Conclusions:
- Electropolymerization of MB provides superior operational stability and detection limits for amperometric NADH detection.
- MBRS offers an extended linear range, suitable for applications requiring quantification over a wider concentration span.
- Screen-printing fabrication influences electrode characteristics, impacting sensor performance.
