scholarly journals A Highly Sensitive Electrochemical Sensor Based on Electrocatalytic Reduction Effect of Cu2+ on Trace Determination of Malathion in Soil and Other Complex Matrices

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
F. M. Alshareef ◽  
M. I. Orif ◽  
E. A. Al-Harbi ◽  
M. S. El-Shahawi
Keyword(s):  
Environmental Samples ◽  
Dynamic Range ◽  
Superior Performance ◽  
Electrocatalytic Reduction ◽  
Adsorbed Species ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
The Matrix ◽  
Reduction Effect

The current strategy reports a highly sensitive and selective square wave-cathodic stripping voltammetric protocol for malathion determination. The established method was based on the controlled adsorptive accumulation of malathion in the presence of Cu2+ ions in an aqueous solution of pH 2 onto the hanging mercury dropping electrode (HMDE) and measuring the resulting cathodic peak current of the adsorbed species at −0.42 V versus Ag/AgCl electrode. The low limits of detection (LOD) and quantification (LOQ) of malathion of the assay were estimated to be 3.1 × 10−10 and 1.03 × 10−9 M with a linear dynamic range of 1.03×10−9 – 2.0 × 10−7 M, respectively. The method was satisfactorily applied and validated for malathion determination in environmental samples. The experimental Student texp and Fexp values did not exceed the tabulated ttab (2.78) and Ftab (6.39) at 95% (P = 0.05) confidence (n = 5), confirming the precision and independence on the matrix. The developed sensing platform for the detection of malathion shows superior performance to conventional electrochemical methods. The proposed sensor offered simple, economical, reproducible, and applicable approach for the determination of malathion in environmental samples.

scholarly journals Paper-based aptamer-antibody biosensor for gluten detection in a deep eutectic solvent (DES)

2021 ◽  
Author(s):  
Rossella Svigelj ◽  
Nicolò Dossi ◽  
Cristian Grazioli ◽  
Rosanna Toniolo
Keyword(s):  
Dynamic Range ◽  
Limit Of Detection ◽  
Low Cost ◽  
Deep Eutectic Solvent ◽  
Electrochemical Sensing ◽  
Sensing Platform ◽  
Screen Printed Carbon Electrode ◽  
Highly Sensitive ◽  
Rapid Tests

AbstractPaper has been widely employed as cheap material for the development of a great number of sensors such as pregnancy tests, strips to measure blood sugar, and COVID-19 rapid tests. The need for new low-cost analytical devices is growing, and consequently the use of these platforms will be extended to different assays, both for the final consumer and within laboratories. This work describes a paper-based electrochemical sensing platform that uses a paper disc conveniently modified with recognition molecules and a screen-printed carbon electrode (SPCE) to achieve the detection of gluten in a deep eutectic solvent (DES). This is the first method coupling a paper biosensor based on aptamers and antibodies with the DES ethaline. Ethaline proved to be an excellent extraction medium allowing the determination of very low gluten concentrations. The biosensor is appropriate for the determination of gluten with a limit of detection (LOD) of 0.2 mg L−1 of sample; it can detect gluten extracted in DES with a dynamic range between 0.2 and 20 mg L−1 and an intra-assay coefficient of 10.69%. This approach can be of great interest for highly gluten-sensitive people, who suffer from ingestion of gluten quantities well below the legal limit, which is 20 parts per million in foods labeled gluten-free and for which highly sensitive devices are essential. Graphical abstract

An electrochemical sensing platform amplified with a Au@Ag nanoparticle-decorated three-dimensional N-doped graphene aerogel for ultrasensitive determination of baicalein

2020 ◽  
Vol 44 (37) ◽  
pp. 15975-15982
Author(s):  
Xueliang Niu ◽  
Weili Zhang ◽  
Yan Huang ◽  
Likai Wang ◽  
Zhongfang Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Electrochemical Sensing ◽  
Ag Nanoparticle ◽  
Graphene Aerogel ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Signal Amplifier ◽  
Doped Graphene ◽  
Sensitive Determination

A novel electrochemical method for highly sensitive determination of baicalein was developed with Au@Ag/3DNGA as signal amplifier.

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

2017 ◽  
Vol 29 (10) ◽  
pp. 2316-2322 ◽  
Author(s):  
Darío Xavier Orellana Jaramillo ◽  
Anandhakumar Sukeri ◽  
Lucas P.H. Saravia ◽  
Patricio Javier Espinoza-Montero ◽  
Mauro Bertotti
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Nanoporous Gold ◽  
Selective Determination ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Anodic Stripping ◽  
Gold Microelectrode

scholarly journals Enhancement of stripping technique for Copper(II) detection in water sample using N,N’-bis(2-hydroxy-4-methoxyacetophenone)ethylenediamine (BME)

2014 ◽  
Vol 10 (3) ◽  
Author(s):  
Syaza Azhari ◽  
Rahmalan Ahamad ◽  
Farediah Ahmad
Keyword(s):  
Tap Water ◽  
Optimal Conditions ◽  
Adsorbed Species ◽  
Accumulation Time ◽  
Highly Sensitive ◽  
Experimental Parameters ◽  
Scan Rate ◽  
Interfering Ions ◽  
Determination Of Copper

A highly sensitive, rapid, simple and selective stripping assay for the determination of trace copper(II) is proposed.  The selectivity and sensitivity of the electroanalytical process on a glassy carbon (GC) electrode were enhanced using the newly synthesized Schiff base N,N’-bis(2-hydroxy-4-methoxyacetophenone)ethylenediamine (BME). The methodology is based on the accumulation of copper(II)–BME complex onto the GC electrode, followed by electrochemical oxidation of the adsorbed species. The effect of experimental parameters such as pH, BME concentration, scan rate, accumulation time and accumulation potential on the sensitivity of copper(II) detection were investigated. Under the optimal conditions, BME has successfully enhanced the copper(II) detection using the GC electrode by nearly 95% with detection limit (LOD) of  2.6 ngL−1. The effects of interfering ions such as Cd(II), Zn(II), Fe(II), Cr(III) and Pb(II) were also investigated. The applicability of this technique was illustrated by the determination of copper(II) ion in tap water.________________________________________GRAPHICAL ABSTRACT 

scholarly journals A hybrid nanocomposite of CeO2–ZnO–chitosan as an enhanced sensing platform for highly sensitive voltammetric determination of paracetamol and its degradation product p-aminophenol

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 15986-15996 ◽  
Author(s):  
Noor B. Almandil ◽  
Mohamed Ibrahim ◽  
Hossieny Ibrahim ◽  
Abdel-Nasser Kawde ◽  
Ibrahim Shehatta ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Degradation Product ◽  
Pharmaceutical Formulations ◽  
Voltammetric Determination ◽  
Hybrid Nanocomposite ◽  
Sensing Platform ◽  
Highly Sensitive

A highly selective electrochemical sensor was fabricated based on CeO2–ZnO–chitosan hybrid nanocomposite modified electrode and was successfully applied for the determination of PAR in pharmaceutical formulations.

A novel and highly sensitive electrochemical sensor based on a high-quality modified graphene electrode for the determination of hydrochlorothiazide in pharmaceutical formulations and human plasma

2015 ◽  
Vol 7 (21) ◽  
pp. 9254-9260 ◽  
Author(s):  
Engin Er ◽  
Hüseyin Çelikkan ◽  
M. Levent Aksu ◽  
Nevin Erk
Keyword(s):  
Electrochemical Sensor ◽  
Human Plasma ◽  
Pharmaceutical Formulations ◽  
Electrochemical Activity ◽  
Electrochemical Sensing ◽  
High Quality ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Modified Graphene

An electrochemical sensing platform based on high-quality graphene was developed to detect hydrochlorothiazide (HCT) with a highly satisfactory electrochemical activity.

scholarly journals Determination of Prostate-Specific Antigen Via The Assembly of a Two-Dimensional Nanoplatform

2021 ◽  
Author(s):  
Junjie Chen ◽  
Xiangqian Li ◽  
Xiaoqi Yu ◽  
Qianming Wang
Keyword(s):  
Prostate Specific Antigen ◽  
Specific Antigen ◽  
Two Dimensional ◽  
Detection Range ◽  
Sensing Platform ◽  
Linear Detection ◽  
Highly Sensitive ◽  
Diverse Application ◽  
Aptamer Probe

Abstract Two-dimensional platforms with favorable features are highly expected for diverse application. In this work, we report a highly sensitive and selective “turn-on” fluorescent nanoprobe for prostate-specific antigen (PSA) detection base on cobalt oxyhydroxide nanosheets (CoOOH NSs). CoOOH NSs are employed as the suitable sensing hosts, in which fluorescein amidite-(abbreviated as FAM) labeled aptamer probe (PA) has been adsorbed on nanosheets. Energy transfer between substrate and optical species has switched off the fluorescence of PA. The strong affinity of PA to the target PSA induces the formation of a rigid aptamer structure and the integration with the CoOOH NSs has been drastically affected. The recognition process has been followed by the release of the aptamer probe PA from the nanosheet surface and the green luminescence has been recovered. The dynamic nano-sensor exhibits highly sensitive and accurate analytical performance toward PSA with a linear detection range from 0.1 to 5 nM and a detection limit of 56.1 pM. Therefore, a simple and efficient sensing platform for the detection of prostate cancer can be established.

Electrochemiluminescence of Ru(bpy)32+/Thioacetamide and its Application for Sensitive Determination of Hepatotoxic Thioacetamide

The Analyst ◽  
2021 ◽  
Author(s):  
Shimeles Addisu Kitte ◽  
Fuad Abduro Bushira ◽  
Haijuan Li ◽  
Yongdong Jin
Keyword(s):  
Environmental Samples ◽  
Determination Method ◽  
Highly Sensitive ◽  
Sensitive Determination

Thioacetamide (TAA) is a well-known hepatotoxic substance, so it is important to determine its presence and content in food and environmental samples. Herein, we report a highly sensitive determination method...

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