Electrochemical Detection of Fenthion Insecticide in Olive Oils by a Sensitive Non-Enzymatic Biomimetic Sensor Enhanced with Metal Nanoparticles

2021 ◽  
Vol 5 (1) ◽  
pp. 64
Author(s):  
Youssra Aghoutane ◽  
Nezha El Bari ◽  
Zoubida Laghrari ◽  
Benachir Bouchikhi
Keyword(s):  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Organophosphate Insecticide ◽  
Imprinted Polymer ◽  
High Recovery ◽  
Molecularly Imprinted ◽  
Olive Oils ◽  
Pulse Voltammetry ◽  
Biomimetic Sensor

Fenthion, an organophosphate insecticide, is a cholinesterase inhibitor and is highly toxic. An electrochemical sensor based on molecularly imprinted polymer is developed here for its detection. For this purpose, 2-aminothiophenol mixed with gold nanoparticles was immobilized on screen-printed gold electrodes. The FEN pattern was then fixed before being covered with 2-aminothiophenol. Cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy methods were used for the electrochemical characterization. The low detection limit was 0.05 mg/Kg over a range of 0.01–17.3 µg/mL. The sensor was successfully applied for the determination of FEN in olive oil samples with high recovery values.

Determination of Diclofenac in Urine Samples by Molecularly-Imprinted Solid-Phase Extraction and Adsorptive Differential Pulse Voltammetry

2007 ◽  
Vol 19 (15) ◽  
pp. 1555-1561 ◽  
Author(s):  
Laura Fernández-Llano ◽  
M. Carmen Blanco-López ◽  
M. Jesús Lobo-Castañón ◽  
Arturo J. Miranda-Ordieres ◽  
Paulino Tuñón-Blanco
Keyword(s):  
Solid Phase Extraction ◽  
Differential Pulse Voltammetry ◽  
Solid Phase ◽  
Differential Pulse ◽  
Urine Samples ◽  
Phase Extraction ◽  
Molecularly Imprinted ◽  
Pulse Voltammetry

scholarly journals Electrochemical sensor based on lead ion-imprinted polymer particles for ultra-trace determination of lead ions in different real samples

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 16033-16040 ◽  
Author(s):  
Xuan Luo ◽  
Weihong Huang ◽  
Qingye Shi ◽  
Wanzhen Xu ◽  
Yu Luan ◽  
...  
Keyword(s):  
Differential Pulse ◽  
Lead Ions ◽  
Lead Ion ◽  
Ion Imprinted Polymer ◽  
Polymer Particles ◽  
Imprinted Polymer ◽  
Ion Imprinted ◽  
Pulse Voltammetry ◽  
Ultra Trace

In this paper, a self-manufactured lead(ii)-selective electrode, which was based on the use of lead(ii) ion imprinted polymer particles (IIPs) to detect lead ions, was studied using differential pulse voltammetry.

scholarly journals Determination of Methyldopa and Paracetamol in Pharmaceutical Samples by a Low Cost Genipa americana L. Polyphenol Oxidase Based Biosensor

2019 ◽  
Vol 9 (3) ◽  
pp. 416-422
Author(s):  
Rafael Souza Antunes ◽  
Douglas Vieira Thomaz ◽  
Luane Ferreira Garcia ◽  
Eric de Souza Gil ◽  
Vernon Sydwill Sommerset ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Low Cost ◽  
Differential Pulse ◽  
Pharmaceutical Samples ◽  
Polyphenol Oxidases ◽  
Voltammetric Techniques ◽  
Relative Standard ◽  
Pulse Voltammetry ◽  
Phenolic Drugs

Purpose: Jenipapo fruit (Genipa americana L) is a natural source of polyphenol oxidases (PPOs) whose potential in pharmaceutical analysis is noteworthy. Henceforth, this work reports the electrochemical study of a low-cost PPO-based biosensor produced from the crude extract of Jenipapo fruits and accounts a practical approach to employ this biosensor in the determination of methyldopa and paracetamol in pharmaceutical samples. Methods: In order to investigate the electrochemical properties of the biosensor, theoretical and practical approaches were employed, and both samples and the biosensor were analyzed through electrochemical impedance spectroscopy (EIS) and voltammetric techniques, namely: differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Results: showcased that the biosensor presented good analytical features, as well as low detection limits (8 μmol L-1 for methyldopa and 5 μmol L-1 for paracetamol). The relative standard deviation was less than 5% mid-assay. Conclusion: The use of this biosensor is a reliable, low cost and useful alternative in the pharmaceutic determination of phenolic drugs (e.g. methyldopa and paracetamol).

An electrochemical sensor for the determination of phoxim based on a graphene modified electrode and molecularly imprinted polymer

2015 ◽  
Vol 7 (11) ◽  
pp. 4786-4792 ◽  
Author(s):  
Xuecai Tan ◽  
Jiawen Wu ◽  
Qi Hu ◽  
Xiaoyu Li ◽  
Pengfei Li ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Molecularly Imprinted Polymer ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
Imprinted Polymer ◽  
Electrochemical Impedance Spectra ◽  
Molecularly Imprinted

The electrochemical impedance spectra of Fe(CN)63−/4− at NIP/graphene/GCE (a), MIP/GCE (b), the bare GCE (c), and MIP/graphene/GCE (d).

Graphene Modified Molecular Imprinted Electrochemical Sensor for Specific Recognition of Bovine Serum Albumin

2013 ◽  
Vol 709 ◽  
pp. 891-894 ◽  
Author(s):  
Feng Li ◽  
Jian Fei Xia ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Electrochemical Impedance ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Modified Glassy Carbon Electrode ◽  
Molecularly Imprinted ◽  
Active Probe ◽  
Pulse Voltammetry

A simple and efficient molecularly imprinted sensor (MIPs/GR/GCE) was firstly prepared by electropolymerization of pyrrole in the presence of bovine serum albumin (BSA) in an aqueous solution based on a graphene modified glassy carbon electrode for the selective recognition of bovine serum albumin. The prepared sensor was characterized by differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS), in which [Fe(CN)6]3−/4−was used as an electrochemical active probe. The results showed a wide linear range from 1.0 × 10-3to 1.0 × 10-9g/mL. And the imprinted biosensor indicated excellent selectivity and high sensitivity.

scholarly journals Development of a Carbon Paste Electrode Containing Benzo-15-Crown-5 for Trace Determination of the Uranyl Ion by Using a Voltammetric Technique

2009 ◽  
Vol 92 (1) ◽  
pp. 241-247 ◽  
Author(s):  
Sunil K Agrahari ◽  
Sangita D Kumar ◽  
Ashwini K Srivastava
Keyword(s):  
Detection Limit ◽  
Differential Pulse Voltammetry ◽  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Pulse Voltammetry ◽  
Paste Electrode

Abstract The interaction of macrocyclic compounds like crown ethers and UO22+ has been studied by electrochemical methods. A modified carbon paste electrode incorporating benzo-15-crown-5 (B15C5) was used to evaluate the electron transfer reaction of UO22+ by cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. Electrochemical impedance studies showed that charge transfer resistance was less for the B15C5-modified electrode than for the plain carbon paste electrode (PCPE). On the basis of these observations, a UO22+-sensitive crown ether chemically modified electrode (CME) for trace analysis was fabricated and investigated in aqueous solutions. It was found that a 5 B15C5CME for UO22+ showed a better voltammetric response than did the PCPE. UO22+ could be quantified at sub-μg/mL levels by differential pulse voltammetry with a detection limit of 0.03 μg/mL. By differential pulse adsorptive stripping voltammetry, UO22+ could be quantified in the working range of 0.002-0.2 μg/mL, with a detection limit of 1.1 μg/L. Simultaneous determination of UO22+, Pb2+, and Cd2+ was possible. The method was successfully applied to the determination of UO22+ in synthetic, as well as real, samples; the results were found to be comparable to those obtained by inductively coupled plasma-atomic emission spectroscopy.

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