Amperometric determination of L-cysteine using a glassy carbon electrode modified with palladium nanoparticles grown on reduced graphene oxide in a Nafion matrix

Yusoff, Norazriena and Rameshkumar, Perumal and Mohamed Noor, An’amt and Huang, Nay Ming (2018) Amperometric determination of L-cysteine using a glassy carbon electrode modified with palladium nanoparticles grown on reduced graphene oxide in a Nafion matrix. Microchimica Acta, 185 (4). ISSN 0026-3672

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Official URL: https://doi.org/10.1007/s00604-018-2782-x

Abstract

An amperometric sensor for L-Cys is described which consists of a glassy carbon electrode (GCE) that was modified with reduced graphene oxide placed in a Nafion film and decorated with palladium nanoparticles (PdNPs). The film was synthesized by a hydrothermal method. The PdNPs have an average diameter of about 10 nm and a spherical shape. The modified GCE gives a linear electro-oxidative response to L-Cys (typically at +0.6 V vs. SCE) within the 0.5 to 10 μM concentration range. Other figures of merit include a response time of less than 2 s, a 0.15 μM lower detection limit (at signal to noise ratio of 3), and an analytical sensitivity of 1.30 μA·μM−1·cm−2. The sensor displays selectivity over ascorbic acid, uric acid, dopamine, hydrogen peroxide, urea, and glucose. The modified GCE was applied to the determination of L-Cys in human urine samples and gave excellent recoveries.

Item Type: Article
Uncontrolled Keywords: Cyclic voltammetry; Electrochemical sensor; Graphene materials; Hydrothermal synthesis; Metal nanoparticles; Nanocomposites; Urine sample
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Jan 2019 03:15
Last Modified: 30 Jan 2019 03:15
URI: http://eprints.um.edu.my/id/eprint/20228

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