Theoretical and electrochemical analysis of L-serine modified graphite paste electrode for dopamine sensing applications in real samples
Original scientific paper
DOI:
https://doi.org/10.5599/jese.1390Keywords:
Amino acid, redox reaction, quantum chemical modelling, voltammetry, sensor, dopamine
Abstract
In this study, the carbon paste electrode (CPE) was modified by grinding L-serine in a pestle and mortar. L-serine (L-s) was shown to be an effective electrocatalyst at the modified CPE (MCPE) interface for detecting dopamine (DA). L-sMCPE showed excellent activity to detect DA in commercial injection samples with a recovery range of 98.9 to 100.5 %. Theoretical studies were used to understand the electrocatalysis of L-serine at the atomic level using frontier molecular orbitals (FMO) and analytical Fukui assay. According to theoretical findings, the amine group of L-serine works as an extra oxidation site (reason for enhanced reduction peak DA) and the carboxylic acid group acts as an additional reduction site (reason for enhanced oxidation peak DA) at the L-sMCPE interface.
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