Methionine – Au Nanoparticle Modified Glassy Carbon Electrode: a Novel Platform for Electrochemical Detection of Hydroquinone

Abstract

A high sensitive electrochemical sensor based on methionine/gold nanoparticles (MET/AuNPs) modified glassy carbon electrode (GCE) was fabricated for the quantitative detection of hydroquinone (HQ). The as-modified electrode was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The electrochemical performance of the sensor to HQ was investigated by using cyclic and differential pulse voltammetry, which revealed its excellent electrocatalytic activity and reversibility towards HQ. The separation of anodic and cathodic peak (∆E p) was decreased from 471 mV to 75 mV. The anodic peak current achieved under the optimum conditions was linear with the HQ concentration ranging from 8 μM to 400 μM with the detection limit 0.12 μM (3σ). The as-fabricated sensor also showed a good selectivity towards HQ without demonstrating interference from other coexisting species. Furthermore, the sensor showed a good performance for HQ detection in environmental water, which suggests its potential practical application.

Disposable Electrochemical Sensor for Food Colorants Detection by Reduced Graphene Oxide and Methionine Film Modified Screen Printed Carbon Electrode

“…Moreover, there is a cooperation between poly(amino acid) film and other nanomaterials to increase electrode’s sensitivity, for example, methionine/gold na-noparticles modified glassy carbon electrode (GCE) for hydroquinone determination. With high surface area and strong adsorptive ability of methionine/gold nanoparticles film, the accumulation of hydroquinone on the electrode was improved [ 19 ]. Poly( l -arginine)/graphene composite film modified GCE was proposed for simultaneous determination of uric acid, xanthine, and hypoxanthine.…”

Optical assays based on colloidal inorganic nanoparticles

“…The high light to heat conversion ability of AuNPs, which results from excited electron-electron collisions, is a useful property of AuNPs for applications in photothermal therapy [53]. AuNPs also can mediate redox and electrocatalytic reactions for electrochemical applications [58, 59]. Whereas electron transfer efficiency is more pronounced in smaller particles, particle size does not affect the optocatalytic activity [55].…”

Electrochemical Sensing Platforms of Dihydroxybenzene: Part 1 – Carbon Nanotubes, Graphene, and their Derivatives

“…This conversion dramatically increases phenol wastewater's toxicity, and HQ has lower biodegradability than the original phenol [13] . Both high‐ and low‐ level HQ concentrations can cause headaches, fatigue, dizziness, nausea, cancer, hypoesthesia, vomit, debility, oedema of internal organs, and kidney damage in humans [8,14,15] . The toxic nature of HQ and its persistency in the environment pose a major threat [10,16] …”

“…Due to their toxic nature and persistence in the environment, they are listed by the US Environmental Protection Agency (EPA) and European Union (EU) as prime organic environmental pollutants [36] . In China, the national standard (GB 8978–1996) states that dihydroxybenzene emission concentration should be less than 4.45×10 −3 mol L −1 [15] . Hence, analytical scientists worldwide have pursued the fabrication of sensitive devices for low‐level detection of this environmental pollutant.…”

“…Therefore, highly susceptible analytical methods for the simultaneous and selective detection of these three isomers are necessary. Different analytical techniques are applied for the selective, simultaneous detection of HQ, CT, and RS, such as high‐performance liquid chromatography (HPLC), [3,42,45,50,64] chemiluminescence, [37,43,47,52,65] spectrophotometry, [35,38,44,47,53] fluorescence, [17,33,39,51] gas chromatography/mass spectrometry (GC−MS), [15,22,46,51,63] pH‐based flow‐injection analysis, [29,40,57,71] capillary electrophoresis, [5,24,54,62] UV‐Vis spectroscopy, [56] colorimetry, [55,68] and electrochemical techniques [37–47,58–61,65–70] …”