Nitric oxide permselectivity in electropolymerized films for sensing applications.

Area of Science:

• Electrochemistry
• Materials Science
• Biomedical Engineering

Background:

• Accurate electrochemical measurement of nitric oxide (NO) in physiological media is challenging due to biological interferents.
• Chemical modification of working electrodes is essential for enhancing NO selectivity and sensitivity.

Purpose of the Study:

• To evaluate self-terminating electropolymerized films for modifying platinum electrodes to improve nitric oxide (NO) detection.
• To compare the performance of modified electrodes in the presence of biological interferents.

Main Methods:

• Electropolymerization of phenylenediamine isomers, phenol, eugenol, and 5-amino-1-naphthol onto platinum electrodes.
• Optimization of electrodeposition parameters using cyclic voltammetry (CV) and constant potential amperometry (CPA).
• Fabrication and comparative analysis of nitric oxide sensors with modified electrodes.

Main Results:

• Slower film formation during cyclic voltammetry deposition generally improved selectivity for NO over nitrite and l-ascorbate.
• Poly-phenol and poly-5-amino-1-naphthol modified electrodes showed the most promising analytical performance.
• Poly-5-amino-1-naphthol films exhibited superior NO sensitivity and detection limits in simulated wound fluid.

Conclusions:

• Electropolymerized films, particularly poly-phenol and poly-5-amino-1-naphthol, effectively enhance the selectivity and sensitivity of platinum electrodes for nitric oxide (NO) detection.
• Modified electrodes show potential for accurate NO measurement in complex biological environments like wound fluid.