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Beigmoradi F, Rohani Moghadam M, Garkani-Nejad Z, Bazmandegan-Shamili A, Masoodi HR. Dual-template imprinted polymer electrochemical sensor for simultaneous determination of malathion and carbendazim using graphene quantum dots. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:5027-5037. [PMID: 37740360 DOI: 10.1039/d3ay01054f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Malathion (MAL) and carbendazim (CBZ) are organophosphate pesticides and fungicides, respectively. They are often used simultaneously in agriculture, and both have been shown to have harmful effects on humans and animals. Therefore, it is important to be able to measure both of these toxins simultaneously in order to assess their potential risks. This study aims to design a dual template electrochemical sensor using a cost-effective graphite-epoxy composite electrode (GECE) modified with molecularly imprinted polymers (MIPs) coated on graphene quantum dots (GQDs) for simultaneous detection of MAL and CBZ in real samples. GQDs were synthesized initially, and their surface was coated with MIPs that were formed using MAL and CBZ as the template molecules, ethylene glycol dimethyl acrylate as the cross-linker, and methacrylic acid as the functional monomer. The GQDs@MIP were characterized using Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, and X-ray scattering spectroscopy. Parameters affecting the sensor response, such as the percentage of GQDs@MIP in the fabricated electrode, the pH of the rebinding solution and analysis solution, and the incubation time, were optimized. The optimum pH values of the rebinding solution were verified using density functional theory (DFT) calculations. Under the optimized conditions, differential pulse voltammetry (DPV) response calibration curves of MAL and CBZ were generated, and the results showed that the sensor had a linear response to MAL in the range of 0.02-55.00 μM with a limit of detection (LOD) of 2 nM (S/N = 3) and to CBZ in the range of 0.02-45.00 μM with a low LOD of 1 nM (S/N = 3). The results also demonstrated the proposed sensor's long-term stability and anti-interference capability. The practical applicability of the fabricated electrode was evaluated for real sample analysis, and good recovery values were obtained.
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Affiliation(s)
- Fariba Beigmoradi
- Department of Chemistry, Faculty of Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
| | - Masoud Rohani Moghadam
- Department of Chemistry, Faculty of Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
| | - Zahra Garkani-Nejad
- Department of Chemistry, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | | | - Hamid Reza Masoodi
- Department of Chemistry, Faculty of Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
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Nur Çenet E, Aydin Z, Keleş M, Bayrakci M. A highly sensitive fluorescent sensor for fenamiphos detection in vegetable samples and living cells based-on an enzyme free system. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 284:121798. [PMID: 36054953 DOI: 10.1016/j.saa.2022.121798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/12/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
Fenamiphos (Fena), an organophosphorous pesticide, is widely used in agricultural soils to control nematodes and thrips. This nematicide is harmful to fish, birds and humans and, causes several diseases. Therefore, the determination of the nematicide is crucial. Fena has been generally detected by enzyme-based systems which require specific conditions. Herein, we integrated a xanthene moiety and a pyrimidine moiety to obtain an enzyme-free detection system for Fena and, a fluorescent sensor (N-(6-(diethylamino)-9-(pyrimidin-5-yl)-3H-xanthen-3-ylidene)-N-ethylethanaminium hexafluorophosphate(V)) (RosPm) was easily prepared. The colorimetric and spectroscopic properties of RosPm were investigated using the UV-vis and fluorescence spectroscopy. RosPm exhibited a high selectivity and sensitivity to Fena over all the metal ions, the anions and pesticides tested in acetonitrile (ACN)/water (H2O) (v:v, 1:1) solution. RosPm showed a clear visual change from purple to light-purple resulting fluorescent quenching with Fena. This sensor could be preferred for detecting Fena in vegetable samples such as tomato, pepper, and cucumber, and visualizing Fena in living MFC-7 cells.
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Affiliation(s)
- Esma Nur Çenet
- Department of Bioengineering, Faculty of Engineering, Karamanoğlu Mehmetbey University, 70200 Karaman, Turkey
| | - Ziya Aydin
- Vocational School of Technical Sciences, Karamanoğlu Mehmetbey University, 70100 Karaman, Turkey; Scientific and Technological Research & Application Center, Karamanoğlu Mehmetbey University, 70100 Karaman, Turkey.
| | - Mustafa Keleş
- Department of Chemistry, Faculty of Arts and Sciences, Osmaniye Korkut Ata University, Osmaniye, Turkey
| | - Mevlut Bayrakci
- Department of Bioengineering, Faculty of Engineering, Karamanoğlu Mehmetbey University, 70200 Karaman, Turkey.
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Chiral Pesticides with Asymmetric Sulfur: Extraction, Separation, and Determination in Different Environmental Matrices. SEPARATIONS 2022. [DOI: 10.3390/separations9020029] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Chiral pesticides with S atoms as asymmetric centers are gaining great importance in the search for new pesticides with new modes of action. As for the rest of the chiral pesticides, the determination of the stereoisomers separately has become crucial in the environmental risks assessment of these pesticides. Therefore, the development of suitable extraction and clean-up methods as well as efficient stereoselective analytical techniques for stereoisomers determination in environmental samples is essential. Currently, liquid/solid phase extraction, microextraction, and QuEChERS-based methods are most commonly used to obtain chiral pesticides from environmental samples. Gas, liquid, and supercritical fluid chromatography together with capillary electrophoresis techniques are the most important for the determination of the stereoisomers of chiral pesticides containing S atoms in its structure. In this study, all these techniques are briefly reviewed, and the advantages and disadvantages of each are discussed
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Qader B, Hussain I, Baron M, Jimenez‐Perez R, Gonzalez‐Rodriguez J, Gil‐Ramírez G. A Molecular Imprinted Polymer Sensor for Biomonitoring of Fenamiphos Pesticide Metabolite Fenamiphos Sulfoxide. ELECTROANAL 2021. [DOI: 10.1002/elan.202060599] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bakhtiyar Qader
- Sulaimani Medicolegal Institute Kurdistan Regional Government Qanat Street Sulaimani Iraq
- Joseph Banks Laboratories, School of Chemistry University of Lincoln Lincoln LN6 7DL UK
| | - Issam Hussain
- School of Life Sciences University of Lincoln, Brayford Pool Lincoln LN6 7TS UK
| | - Mark Baron
- Joseph Banks Laboratories, School of Chemistry University of Lincoln Lincoln LN6 7DL UK
| | - Rebeca Jimenez‐Perez
- Joseph Banks Laboratories, School of Chemistry University of Lincoln Lincoln LN6 7DL UK
- Department of Physical Chemistry, Higher Technical School of Industrial Engineering University of Castilla-La Mancha, Campus Universitario s/n 02071 Albacete Spain
| | | | - Guzmán Gil‐Ramírez
- Joseph Banks Laboratories, School of Chemistry University of Lincoln Lincoln LN6 7DL UK
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Dispersive micro solid-phase extraction with gas chromatography for determination of Diazinon and Ethion residues in biological, vegetables and cereal grain samples, employing D-optimal mixture design. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105680] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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Carrão DB, Perovani IS, de Albuquerque NCP, de Oliveira ARM. Enantioseparation of pesticides: A critical review. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2019.115719] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Electrochemical determination of the organophosphate compound Fenamiphos and its main metabolite, Fenamiphos sulfoxide. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-018-2334-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Govindasamy M, Sakthinathan S, Chen SM, Chiu TW, Sathiyan A, Merlin JP. Reduced Graphene Oxide Supported Cobalt Bipyridyl Complex for Sensitive Detection of Methyl Parathion in Fruits and Vegetables. ELECTROANAL 2017. [DOI: 10.1002/elan.201700186] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mani Govindasamy
- Electroanalysis and Bioelectrochemistry Lab; Department of Chemical Engineering and Biotechnology; National Taipei University of Technology, No.1, Section 3; Chung-Hsiao East Road Taipei 106 Taiwan (R.O.C
| | - Subramanian Sakthinathan
- Electroanalysis and Bioelectrochemistry Lab; Department of Chemical Engineering and Biotechnology; National Taipei University of Technology, No.1, Section 3; Chung-Hsiao East Road Taipei 106 Taiwan (R.O.C
| | - Shen-Ming Chen
- Electroanalysis and Bioelectrochemistry Lab; Department of Chemical Engineering and Biotechnology; National Taipei University of Technology, No.1, Section 3; Chung-Hsiao East Road Taipei 106 Taiwan (R.O.C
| | - Te-Wei Chiu
- Department of Materials and Mineral Resources Engineering; National Taipei University of Technology, Taipei; Taiwan (ROC
| | - Anandaraj Sathiyan
- Department of Chemistry; Bishop Heber College (Autonomous); Tiruchirappalli- 620 017, Tamil Nadu India
| | - Johnson Princy Merlin
- Department of Chemistry; Bishop Heber College (Autonomous); Tiruchirappalli- 620 017, Tamil Nadu India
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West C, Konjaria ML, Shashviashvili N, Lemasson E, Bonnet P, Kakava R, Volonterio A, Chankvetadze B. Enantioseparation of novel chiral sulfoxides on chlorinated polysaccharide stationary phases in supercritical fluid chromatography. J Chromatogr A 2017; 1499:174-182. [PMID: 28404372 DOI: 10.1016/j.chroma.2017.03.089] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 11/28/2022]
Abstract
Asymmetric sulfoxides is a particular case of chirality that may be found in natural as well as synthetic products. Twenty-four original molecules containing a sulfur atom as a centre of chirality were analyzed in supercritical fluid chromatography on seven polysaccharide-based chiral stationary phases (CSP) with carbon dioxide - methanol mobile phases. While all the tested CSP provided enantioseparation for a large part of the racemates, chlorinated cellulosic phases proved to be both highly retentive and highly enantioselective towards these species. Favourable structural features were determined by careful comparison of the enantioseparation of the probe molecules. Molecular modelling studies indicate that U-shaped (folded) conformations were most favorable to achieve high enantioresolution on these CSP, while linear (extended) conformations were not so clearly discriminated. For a subset of these species adopting different conformations, a broad range of mobile phase compositions, ranging from 20 to 100% methanol in carbon dioxide, were investigated. While retention decreased continuously in this range, enantioseparation varied in a non-monotonous fashion. Abrupt changes in the tendency curves of retention and selectivity were observed when methanol proportion reaches about 60%, suggesting that a change in the conformation of the analytes and/or chiral selector is occurring at this point.
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Affiliation(s)
- Caroline West
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France.
| | - Mari-Luiza Konjaria
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
| | - Natia Shashviashvili
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
| | - Elise Lemasson
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Pascal Bonnet
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Rusudan Kakava
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Alessandro Volonterio
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Via Mancinelli 7, 20131, Milan, Italy; CNR Istituto di Chimica del Riconoscimento Moleculare (ICRM), Via Mancinelli 7, 20131 Milan, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
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Colorimetric biosensor for the assay of paraoxon in environmental water samples based on the iodine-starch color reaction. Anal Chim Acta 2017; 967:59-63. [PMID: 28390486 DOI: 10.1016/j.aca.2017.02.028] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 02/24/2017] [Accepted: 02/25/2017] [Indexed: 01/08/2023]
Abstract
In this work, a new colorimetric biosensor for the assay of paraoxon was developed via the conventional iodine-starch color reaction and multi-enzyme cascade catalytic reactions. In the presence of acetylcholine chloride, acetylcholinesterase (AChE) and choline oxidase (ChO) catalyzed the formation of H2O2, which then activated horseradish peroxidase (HRP) to catalyze the oxidation of KI to produce an iodine-starch color reaction. Upon exposure to paraoxon, the catalytic activity of AChE was inhibited and less H2O2 generated, resulting in a decrease in the production of I2 and a drop in the intensity of solution color. This colorimetric biosensor showed high sensitivity for the assay of paraoxon with a limit of detection 4.7 ppb and was applied for the assay of paraoxon in spiked real samples. By employing the conventional iodine-starch color reaction, this biosensor has the potential of on-site assay of OPs residues in environmental samples.
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In-line coupling of an achiral-chiral column to investigate the enantioselective in vitro metabolism of the pesticide Fenamiphos by human liver microsomes. J Chromatogr A 2016; 1467:326-334. [DOI: 10.1016/j.chroma.2016.08.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 08/12/2016] [Accepted: 08/16/2016] [Indexed: 11/20/2022]
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12
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Prabhakar N, Thakur H, Bharti A, Kaur N. Chitosan-iron oxide nanocomposite based electrochemical aptasensor for determination of malathion. Anal Chim Acta 2016; 939:108-116. [PMID: 27639149 DOI: 10.1016/j.aca.2016.08.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 07/29/2016] [Accepted: 08/09/2016] [Indexed: 11/30/2022]
Abstract
An electrochemical aptasensor based on chitosan-iron oxide nanocomposite (CHIT-IO) film deposited on fluorine tin Oxide (FTO) was developed for the detection of malathion. Iron oxide nanoparticles were prepared by co-precipitation method and characterized by Transmission electron microscopy and UV-Visible spectroscopy. The biotinylated DNA aptamer sequence specific to the malathion was immobilized onto the iron oxide doped-chitosan/FTO electrode by using streptavidin as linking molecule. Various characterization studies like Field Emission-Scanning Electron Microscopy (FE-SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Electrochemical studies were performed to attest the successful fabrication of bioelectrodes. Experimental parameters like aptamer concentration, response time, stability of electrode and reusability studies were optimized. Aptamer immobilized chitosan-iron oxide nanocomposite (APT/SA/CHIT-IO/FTO) bioelectrodes exhibited LOD of about 0.001 ng/mL within 15 min and spike-in studies revealed about 80-92% recovery of malathion from the lettuce leaves and soil sample.
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Affiliation(s)
- Nirmal Prabhakar
- Department of Biochemistry, Panjab University, Chandigarh 160014, India.
| | - Himkusha Thakur
- Department of Biochemistry, Panjab University, Chandigarh 160014, India
| | - Anu Bharti
- Department of Biochemistry, Panjab University, Chandigarh 160014, India
| | - Navpreet Kaur
- Department of Biochemistry, Panjab University, Chandigarh 160014, India
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Zhu W, Liu W, Li T, Yue X, Liu T, Zhang W, Yu S, Zhang D, Wang J. Facile green synthesis of graphene-Au nanorod nanoassembly for on-line extraction and sensitive stripping analysis of methyl parathion. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.09.085] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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14
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Preparation of polynorepinephrine adhesive coating via one-step self-polymerization for enantioselective capillary electrochromatography coupled with electrogenerated chemiluminesense detection. J Chromatogr A 2013; 1284:194-201. [DOI: 10.1016/j.chroma.2013.02.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 02/02/2013] [Accepted: 02/05/2013] [Indexed: 11/20/2022]
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West C, Cieslikiewicz-Bouet M, Lewinski K, Gillaizeau I. Enantiomeric Separation of Original Heterocyclic Organophosphorus Compounds in Supercritical Fluid Chromatography. Chirality 2013; 25:230-7. [DOI: 10.1002/chir.22133] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 10/15/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Caroline West
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
| | - Monika Cieslikiewicz-Bouet
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
- Department of Organic Chemistry; Jagiellonian University; R. Ingardena 3 30060 Krakow Poland
| | - Krzysztof Lewinski
- Department of Organic Chemistry; Jagiellonian University; R. Ingardena 3 30060 Krakow Poland
| | - Isabelle Gillaizeau
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
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Servais AC, Fillet M. Application of dual cyclodextrin systems in capillary electrophoresis enantioseparations. Methods Mol Biol 2013; 970:289-295. [PMID: 23283785 DOI: 10.1007/978-1-62703-263-6_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The enantioseparation of acidic and neutral compounds can be successfully achieved in capillary electrophoresis (CE) using dual cyclodextrin (CD) systems. This chapter describes how to separate the enantiomers of acidic or neutral substances using dual CD systems made up of a negatively charged CD derivative, i.e., sulfobutyl-β-CD (SB-β-CD) or carboxymethyl-β-CD (CM-β-CD), in combination with a neutral one, namely, heptakis(2,3,6-tri-O-methyl)-β-CD (TM-β-CD). An acidic compound (carprofen) and a weakly acidic drug (pentobarbital) were selected as model compounds.
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Liang RP, Liu CM, Meng XY, Wang JW, Qiu JD. A novel open-tubular capillary electrochromatography using β-cyclodextrin functionalized graphene oxide-magnetic nanocomposites as tunable stationary phase. J Chromatogr A 2012; 1266:95-102. [DOI: 10.1016/j.chroma.2012.09.101] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 09/25/2012] [Accepted: 09/28/2012] [Indexed: 01/27/2023]
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Zeng Y, Yu D, Yu Y, Zhou T, Shi G. Differential pulse voltammetric determination of methyl parathion based on multiwalled carbon nanotubes-poly(acrylamide) nanocomposite film modified electrode. JOURNAL OF HAZARDOUS MATERIALS 2012; 217-218:315-322. [PMID: 22494904 DOI: 10.1016/j.jhazmat.2012.03.033] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 02/16/2012] [Accepted: 03/10/2012] [Indexed: 05/31/2023]
Abstract
A sensitive electrochemical differential pulse voltammetry method was developed for detecting methyl parathion based on multiwalled carbon nanotubes-poly(acrylamide) (MWCNTs-PAAM) nanocomposite film modified glassy carbon electrode. The novel MWCNTs-PAAM nanocomposite, containing high content of amide groups, was synthesized by PAAM polymerizing at the vinyl group functionalized MWCNTs surface using free radical polymerization. The MWCNTs-PAAM nanocomposite was characterized by Fourier transform infrared spectroscopy, thermal gravimetric analysis and scanning electron microscopy. Electrochemical behavior and interference studies of MWCNTs-PAAM/GCE for methyl parathion were investigated. The experimental results demonstrated that the MWCNTs-PAAM/GCE exhibited a high adsorption and strong affinity toward methyl parathion compared with some metal ions and nitroaromatic compounds, which exist in environmental samples. The adsorbed amount of methyl parathion on the MWCNTs-PAAM/GCE approached the equilibrium value upon 5 min adsorption time. A linear calibration curve for methyl parathion was obtained in the concentration range from 5.0×10(-9) to 1.0×10(-5) mol L(-1), with a detection limit of 2.0×10(-9) mol L(-1). The MWCNTs-PAAM/GCE was proved to be a suitable sensing tool for the fast, sensitive and selective determination of methyl parathion in environmental water samples.
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Affiliation(s)
- Yanbo Zeng
- Department of Chemistry and Shanghai Key Laboratory of Green Chemistry and Chemical Process, East China Normal University, Shanghai, PR China
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Liang RP, Meng XY, Liu CM, Qiu JD. PDMS microchip coated with polydopamine/gold nanoparticles hybrid for efficient electrophoresis separation of amino acids. Electrophoresis 2011; 32:3331-40. [DOI: 10.1002/elps.201100403] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Molaabasi F, Talebpour Z. Enantiomeric discrimination and quantification of the chiral organophosphorus pesticide fenamiphos in aqueous samples by a novel and selective ³¹P nuclear magnetic resonance spectroscopic method using cyclodextrins as chiral selector. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:803-808. [PMID: 21192704 DOI: 10.1021/jf103169p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A rapid, selective, and accurate quantitative ³¹P nuclear magnetic resonance (³¹P NMR) spectroscopy method was used for the chiral recognition of the racemic organophosphorus pesticide fenamiphos using chiral solvating agents (CSAs). Six neutral cyclodextrins (CDs) (α-CD, β-CD, methyl-β-CD, hydroxyethyl-β-CD, hydroxypropyl-β-CD, and hydroxypropyl-γ-CD) and two anionic CDs (carboxymethyl-β-CD and carboxyethyl-β-CD) were selected for these experiments. The shift displacement values (Δδ), after addition of each of the eight CDs in the highest possible molar ratio to a guest, were recorded. The results showed that β-CD and hydroxypropyl-β-CD were the best chiral solvating agents for the enantiomeric discrimination of fenamiphos. Two-dimension rotating frame nuclear Overhauser spectroscopy (ROESY) was used to investigate the structure of the β-CD-fenamiphos inclusion complex in aqueous solution. To determine the fenamiphos enantiomers, a calibration curve was drawn for two enantiomers over the range of 0.05-0.25 mg mL⁻¹. The limits of detection (S/N = 3) were obtained as 0.0068 and 0.0060 mg mL⁻¹ for fenamiphos enantiomers. The recovery studies were performed on aqueous real samples ranging from 94 to 107% with coefficients of variation of ≤ 9%.
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Affiliation(s)
- Fatemeh Molaabasi
- Department of Chemistry, Faculty of Science, Alzahra University, Vanak, Tehran, Iran
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Tian Q, Lv C, Ren L, Zhou Z. Direct Enantiomeric Separation of Chiral Pesticides by LC on Amylose Tris(3,5-dimethylphenylcarbamate) Stationary Phase under Reversed Phase Conditions. Chromatographia 2010. [DOI: 10.1365/s10337-010-1539-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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