Electrochemically treated glassy carbon electrode for amperometric detection in high-performance liquid...

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Biomedical Science

Background:

• Electrochemical sensors are crucial for detecting biomolecules.
• Glassy carbon electrodes (GCEs) are widely used but can suffer from fouling and limited sensitivity.
• Pre-treatment methods can improve electrode performance.

Purpose of the Study:

• To investigate the effectiveness of electrochemical pre-treatment on GCEs for detecting specific analytes.
• To demonstrate the utility of a pre-anodized electrode in high-performance liquid chromatography (HPLC).

Main Methods:

• Glassy carbon electrodes were electrochemically pre-treated in a phosphate buffer (0.2 M, pH 6.5) at 1900 mV vs. Ag/AgCl for 2 minutes.
• Amperometric detection was employed for analytes including tyrosine, oxipurinol, lactic acid, and pyruvic acid.
• The pre-treated electrodes were applied in a high-performance liquid chromatography setup.

Main Results:

• Electrochemical pre-treatment significantly enhanced the amperometric response of the GCE.
• The pre-anodized electrode exhibited stabilized responses for the oxidation of tyrosine and both lactic and pyruvic acids.
• Improved sensitivity and stability were observed for the detection of these electroactive compounds.

Conclusions:

• Electrochemical pre-treatment is a viable method to improve GCE performance for amperometric detection.
• Pre-anodized electrodes offer enhanced and stabilized detection of key biological and chemical species.
• This technique shows promise for applications in biological sample analysis using HPLC.