Volume 34, Issue 12 p. 1913-1927
Research Article

Separation and Detection of Tyrosine and Phenylalanine-derived Oxidative Stress Biomarkers Using Microchip Electrophoresis with Electrochemical Detection

Dhanushka B. Weerasekara

Dhanushka B. Weerasekara

Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, Lawrence, KS, USA

Department of Chemistry, University of Kansas, Lawrence, KS, USA

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Susan M. Lunte

Corresponding Author

Susan M. Lunte

Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, Lawrence, KS, USA

Department of Chemistry, University of Kansas, Lawrence, KS, USA

Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, USA

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First published: 31 December 2021

Abstract

A method for the determination of selected aromatic amino acid biomarkers of oxidative stress using microchip electrophoresis with electrochemical detection is described. The separation of the major reaction products of phenylalanine and tyrosine with reactive nitrogen and oxygen species was accomplished using ligand exchange micellar electrokinetic chromatography with a PDMS/glass hybrid chip. Electrochemical detection was achieved using a pyrolyzed photoresist film working electrode. The system was evaluated for the analysis of the products of the Fenton reaction with tyrosine and phenylalanine, and the reaction of peroxynitrite with tyrosine.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.