NDLI: A cysteine sensor based on a gold nanoparticle–iron phthalocyanine modified graphite paste electrode

Content Provider	Royal Society of Chemistry (RSC)
Author	Abbas, Mohammed Nooredeen Radowan, Abdellatef A. Dempsey, Eithne Saeed, Ayman Ali Singh, Baljit
Copyright Year	2015
Abstract	An electrochemical sensor for the sensitive and selective detection of cysteine is proposed based on a gold nanoparticle (AuNP)–iron(III) phthalocyanine (FePc) modified graphite paste electrode. The sensor was characterised using scanning electron microscopy (SEM/EDX), transmission electron microscopy (TEM), cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Cyclic voltammetry studies demonstrated that the electrochemical behaviour of cysteine at the AuNP–FePc modified graphite paste electrode is considerably improved compared to both the blank (unmodified) and FePc-modified graphite paste electrodes. The enhancement of the anodic redox signal for cysteine was due to a catalytic effect of gold nanoparticles which was investigated using three different graphite paste electrodes − 0.02, 0.055 and 0.11 wt% Au nanoparticles, each with a fixed quantity of FePc (5 wt%). The sensor fabricated using 0.055 wt% AuNPs exhibited optimum sensitivity as examined via differential pulse voltammetry measurements with an analytical range of 50–1000 μM and a LOD of 0.27 μM. The sensor was utilised for the determination of cysteine in pharmaceutical preparations.
Starting Page	2529
Ending Page	2536
Page Count	8
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	7
Issue Number	6
Journal	Analytical Methods
DOI	10.1039/c4ay02944e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Cysteine Electrode Nanoparticle Redox Scanning electron microscope Cyclic voltammetry Phthalocyanine Transmission electron microscopy Graphite Electrochemistry Differential pulse voltammetry Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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