L- Cysteine Based Polymer Matrix Decorated with Au-Nanoparticles: As a Sensing Platform for Simultaneous Determination of Hydroquinone and Catechol

Abstract

In the present study reported, fully electrochemical methodology was used to prepare a new nanocomposite on a glassy carbon electrode. Cysteic acid was formed by electrochemical oxidation of L-cysteine on the surface of a glassy carbon electrode (GCE) and used as a proper polymeric framework for deposition of Au nanoparticles (AuNPs). Field emission scanning electron microscopy (FESEM) was used for the surface characterization. It was shown that this composite electrode not only separates the voltammetric signals of hydroquinone (HQ) and catechol (CC), but also shows higher oxidation current for these molecules. Under the optimized condition, a linear dynamic range of 0.09 μmol dm−3 to 39.2 μmol dm−3 range for hydroquinone with the detection limit of 20 nM and from 0.09 μmol dm−3 to 39.2 μmol dm−3 for catechol with the detection limit of 60 nM were obtained. The proposed method was evaluated by determination of HQ and CC in rain and tap water samples with satisfactory results (recovery > 96%).

A Sensitive and Green Method for Determination of Catechol Using Multi-Walled Carbon Nanotubes/Poly(1,5-diaminonaphthalene) Composite Film Modified Glassy Carbon Electrode

“…For instance, the following electrodes were reported for the electrochemical detection of catechol: Cu-MOF-199/single-walled carbon nanotubes modified GCE, 14 multi-walled carbon nanotubes modified GCE, 15 carbon nanotubes modified-pencil electrode, 16 copper-polypyrrole modified GCE, 17 gold nanoparticles decorated onto graphene oxide@polydopamine modified GCE, 18 palygorskite-modified carbon paste electrode, 19 graphene oxide-polymelamine modified GCE, 20 multi-walled carbon nanotubes/polydopamine/gold nanoparticles modified GCE, 21 gold nanoparticle-graphene nanohybrid bridged 3-amino-5-mercapto modified GCE, 22 graphene-TiO 2 nanocomposite modified GCE, 23 Co 3 O 4 @carbon composites modified GCE, 24 fulvic acid reduced graphene oxide and Co-phthalocyanine nanorods modified GCE, 25 multi-walled carbon nanotubes@reduced graphene oxide nanoribbon modified GCE, 26 hollow nitrogen-doped mesoporous carbon spheres decorated graphene modified GCE, 27 activated screen printed carbon z E-mail: ibadr1@gmail.com electrode, 28 multi-walled carbon nanotubes and TiO 2 nanoparticles in a chitosan matrix modified GCE, 29 tyrosinase immobilized on chitosan microspheres modified GCE, 30 chitosan-stabilized multi-walled carbon nanotubes modified GCE, 31 gold nanoparticle-cysteic acid modified GCE. 32 Exploring new modified electrodes and new chemistry is a worthwhile venture and could lead to sensors with improved response characteristics or simpler routes for preparation of membrane electrodes.…”

Simultaneous Determination of Hydroquinone and Catechol by Differential Alternative Pulses Voltammetry

“…The detection limit of the determinations, evaluated on the basis of S/N=3 was found to be 0.2 μmol L −1 for HQ and 0.5 μmol L −1 for CC. It is acceptable, compared with data reported in the literature, which show that the detection limits reached by applying DPV and modified electrodes vary in the range from 0.007 μmol L −1 to 50 μmol L −1 for HQ and from 0.009 μmol L −1 to 50 μmol L −1 for CC . Costly materials and complicated techniques for electrode modification were required to achieve lower limits of detection by DPV.…”

Electrochemical Sensing Platforms of Dihydroxybenzene: Part 2 – Nanomaterials Excluding Carbon Nanotubes and Graphene

“…The prepared biosensor showed good repeatability, stability, and anti‐interference stability. In addition to this study, a cube‐shaped gold/Prussian blue analogue (Au/PBA) nanocomposite modified gold disk electrode, [122] AuNP‐deposited L‐cysteine‐modified GCE, [123] platinum nanoparticles (Pt‐NPs), fullerene (C 60 )‐composite‐modified pyrolytic graphite electrode (PGE), [124] and a modified GCE containing a composite of AuNPs and carbon nanocages (CNCs) (AuNPs@CNCs) [125] were reported for the selective and simultaneous detection of HQ and CT. Table 3 presents some important parameters of RS detection based on nanomaterials reported in the selected literature, and a summary of parameters used in nanomaterial‐based simultaneous detection of HQ and CT is tabulated in Table 4.…”