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Meddeb-Limem S, Ben Fredj A. Computational study of the dimerization of glyphosate: mechanism and effect of solvent. RSC Adv 2024; 14:23184-23203. [PMID: 39045405 PMCID: PMC11264236 DOI: 10.1039/d4ra04300f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Accepted: 07/09/2024] [Indexed: 07/25/2024] Open
Abstract
A computational study on the structure and stability of different series of glyphosate (Glyph) dimers comprising nonionized (N) and zwitterionic structures (Z) for neutral monomers, followed by an analysis of energetics of Glyph dimerization process have been performed by means of quantum chemical calculations in different media. Optimized geometries for energy minima, as well as relative potential and free energies of the possible various conformers of each series of Glyph dimer were computed as a function of the medium at B3LYP-D3/6-311++G(2d,2p) level. The solvation model based on density (SMD) is employed for all solution phase computations. Non-ionized dimers (DN), anion-cation (AC) and either zwitterion-zwitterion (DZP and DZC) or non-ionized-phosphonate zwitterion (NZP) ionized neutral forms of Glyph dimer are predicted to exist in the gas phase and in solution in large contrast to Glyph monomers. The DZC dimer form exhibiting a centrosymmetric arrangement of two carboxylate zwitterion units was found to be the most stable dimer structure in all media. In aqueous solution, the DZP and AC dimer type structures are significantly stabilized by hydration. The tautomerisms between DZC, DZP and AC dimer type structures have been investigated in the gas phase and in solution. The DZC type structures are more prone to experience proton transfer in water than in the gas phase and in cyclohexane. The mechanism for the tautomerization process in neutral ionized Glyph dimers proceeds via two direct proton transfer paths: DZP ⇋ AC ⇋ DZC. Results show that solvents play a key role in modulating the energetics of the dimerization process of Glyph. Solvation in cyclohexane, favors the dimerization process however, hydration opposed it. In aqueous solution, the mechanism of the dimerization of Glyph from its phosphonate zwitterionic monomer form (ZP) could be described by a set of equilibria including direct proton transfer paths as follows: 2ZP ⇋ DZP ⇋ AC ⇋ DZC. According to our results, in aqueous solution, DZC Glyph dimers and their corresponding DZP and AC tautomers should be present in higher concentration than phosphonate zwitterionic Glyph monomers for high Glyph concentration, a fact that seems controversial in the literature.
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Affiliation(s)
- Sondes Meddeb-Limem
- Unité de recherche de Modélisation en Sciences Fondamentales et Didactiques, équipe de Chimie Théorique et Réactivité UR14ES10, Institut Préparatoire aux études d'Ingénieurs d'El Manar, Université de Tunis El Manar B. P. 244 El Manar II 2092 Tunis Tunisia +216 72 593 450 +216 72 593 450 + 216 54744256
| | - Arij Ben Fredj
- Unité de recherche de Modélisation en Sciences Fondamentales et Didactiques, équipe de Chimie Théorique et Réactivité UR14ES10, Institut Préparatoire aux études d'Ingénieurs d'El Manar, Université de Tunis El Manar B. P. 244 El Manar II 2092 Tunis Tunisia +216 72 593 450 +216 72 593 450 + 216 54744256
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S Araújo W, Caldeira Rêgo CR, Guedes-Sobrinho D, Cavalheiro Dias A, Rodrigues do Couto I, Bordin JR, Ferreira de Matos C, Piotrowski MJ. Quantum Simulations and Experimental Insights into Glyphosate Adsorption Using Graphene-Based Nanomaterials. ACS APPLIED MATERIALS & INTERFACES 2024; 16:31500-31512. [PMID: 38842224 DOI: 10.1021/acsami.4c05733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
The increasing global demand for food and agrarian development brings to light a dual issue concerning the use of substances that are crucial for increasing productivity yet can be harmful to human health and the environment when misused. Herein, we combine insights from high-level quantum simulations and experimental findings to elucidate the fundamental physicochemical mechanisms behind developing graphene-based nanomaterials for the adsorption of emerging contaminants, with a specific focus on pesticide glyphosate (GLY). We conducted a comprehensive theoretical and experimental investigation of graphene-based supports as promising candidates for detecting, sensing, capturing, and removing GLY applications. By combining ab initio molecular dynamics and density functional theory calculations, we explored several chemical environments encountered by GLY during its interaction with graphene-based substrates, including pristine and punctual defect regions. Our results unveiled distinct interaction behaviors: physisorption in pristine and doped graphene regions, chemisorption leading to molecular dissociation in vacancy-type defect regions, and complex transformations involving the capture of N and O atoms from impurity-adsorbed graphene, resulting in the formation of new GLY-derived compounds. The theoretical findings were substantiated by FTIR and Raman spectroscopy, which proposed a mechanism explaining GLY adsorption in graphene-based nanomaterials. The comprehensive evaluation of adsorption energies and associated properties provides valuable insights into the intricate nature of these interactions, shedding light on potential applications and guiding future experimental investigations of graphene-based nanofilters for water decontamination.
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Affiliation(s)
- Wanderson S Araújo
- Department of Physics, Federal University of Pelotas, PO Box 354, Pelotas, Rio Grande do Sul 96010-900, Brazil
| | - Celso Ricardo Caldeira Rêgo
- Institute of Nanotechnology Hermann-von-Helmholtz-Platz, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Diego Guedes-Sobrinho
- Chemistry Department, Federal University of Paraná, Curitiba, Paraná 81531-980, Brazil
| | - Alexandre Cavalheiro Dias
- Institute of Physics and International Center of Physics, University of Brasília, Brasília, Federal District 70919-970, Brazil
| | - Isadora Rodrigues do Couto
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - José Rafael Bordin
- Department of Physics, Federal University of Pelotas, PO Box 354, Pelotas, Rio Grande do Sul 96010-900, Brazil
| | - Carolina Ferreira de Matos
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Maurício Jeomar Piotrowski
- Department of Physics, Federal University of Pelotas, PO Box 354, Pelotas, Rio Grande do Sul 96010-900, Brazil
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Gong Y, Gong M. Sensitive detection of herbicide residues using field-amplified sample injection coupled with electrokinetic supercharging in flow-gated capillary electrophoresis. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:2025-2032. [PMID: 38516858 DOI: 10.1039/d3ay01950k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Residues of glyphosate (GlyP) and its major degradation product, aminomethylphosphonic acid (AMPA), widely exist in the water system and plant products and thus are also present in the bodies of animals and humans. Although no solid evidence has been obtained, the concern about the cancer risk of GlyP is persistent. The measurement of GlyP and AMPA in trace levels is often needed but lacks readily available analytical approaches with detection sensitivity, accuracy and speed. This study aims to develop a simple and robust technique for the sensitive detection of GlyP and AMPA residues in a surface water system with flow-gated capillary electrophoresis (CE). Experimentally, water samples were first fluorogenically derivatized with 4-fluoro-7-nitrobenzofurazan (NBD-F) in a low-conductivity buffer at room temperature, and the mixture was injected and concentrated in the capillary based on field-amplified sample injection (FASI) coupled with electrokinetic supercharging (EKS). This scheme included a step of sample buffer injection upon electroosmotic pumping, where negatively charged analytes were electrophoretically rejected, followed by automatic voltage reversal for FASI-EKS. The detection sensitivity was improved by 296, 444, and 861 times for glufosinate (GluF), AMPA, and GlyP, respectively. The proposed method was validated in terms of accuracy, precision, limits of detection (LODs), and linearity. The LODs were estimated to be 50.0 pM, 5.0 pM, and 10.0 pM for GluF, AMPA, and GlyP, respectively. Its application was demonstrated by measuring GluF and AMPA in water samples collected from a local water system. This study provides an effective approach for the online preconcentration of negatively charged analytes, thus enabling the sensitive detection of herbicide residues in water samples. The method can also be applied to analyze other samples, including biological fluids and plant products, upon appropriate sample preparation such as solid phase extraction of analytes.
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Affiliation(s)
- Ying Gong
- Department of Chemistry and Biochemistry, Wichita State University, 1845 Fairmount St, Wichita, Kansas 67260, USA.
| | - Maojun Gong
- Department of Chemistry and Biochemistry, Wichita State University, 1845 Fairmount St, Wichita, Kansas 67260, USA.
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Obeid G, Moraes GO, Penna TC, Schenberg LA, Ducati LC, Correra TC. Solvation effects on glyphosate protonation and deprotonation states evaluated by mass spectrometry and explicit solvation simulations. J Chem Phys 2023; 158:054306. [PMID: 36754805 DOI: 10.1063/5.0134003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Glyphosate is a widely used herbicide, and its protonation and deprotonation sites are fundamental to understanding its properties. In this work, the sodiated, protonated, and deprotonated glyphosate were evaluated in the gas phase by infrared multiple photon dissociation spectroscopy to determine the exact nature of these coordination, protonation, and deprotonation states in the gas phase. In this context, Natural Bond Orbital analyses were carried out to unravel interactions that govern glyphosate (de)protonation states in the gas phase. The solvent effect on the protonation/deprotonation equilibria was also investigated by implicit (Solvation Model Based on Density and polarizable continuum models) and explicit solvation models (Monte Carlo and Molecular Dynamics simulations). These results show that glyphosate is protonated in the phosphonate group in the gas phase because of the strong hydrogen bond between the carboxylic oxygen (O7) and the protonated phosphonate group (O8-H19), while the most stable species in water is protonated at the amino group because of the preferential interaction of the NH2 + group and the solvent water molecules. Similarly, deprotonated glyphosate [Glyp-H]- was shown to be deprotonated at the phosphonate group in the gas phase but not in solution, also because of the preferential solvation of the NH2 + group present in the other deprotomers. Therefore, these results show that the stabilization of the protonated amino group by the solvent molecules is the governing factor of the (de)protonation equilibrium of glyphosate in water.
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Affiliation(s)
- Guilherme Obeid
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
| | - Gustavo O Moraes
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
| | - Tatiana C Penna
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
| | - Leonardo A Schenberg
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
| | - Lucas C Ducati
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
| | - Thiago C Correra
- Department of Fundamental Chemistry, Institute of Chemistry-University of São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, São Paulo, SP, Brazil
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Hottes E, da Silva CO, Bauerfeldt GF, Castro RN, de Lima JHC, Camargo LP, Dall'Antonia LH, Herbst MH. Efficient removal of glyphosate from aqueous solutions by adsorption on Mg-Al-layered double oxides: thermodynamic, kinetic, and mechanistic investigation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:83698-83710. [PMID: 35771329 DOI: 10.1007/s11356-022-21703-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 06/23/2022] [Indexed: 06/15/2023]
Abstract
Up to 90% of glyphosate was removed in 40 min by a 2:1 Mg2Al-layered double oxide (LDO) at pH 10, and the adsorption kinetics fitted a pseudo-second-order law. The adsorption isotherms were type L, and the Langmuir model best fitted the experimental data, with qmax of 158.22 μg/mg at 25 °C. The intraparticle diffusion model suggested that the adsorption process is dependent on the thickness and formation of the film at the solution/solid interface. The XRD results excluded the intercalation of glyphosate anions, and FTIR along with solid-state 13C and 31P MAS NMR confirmed that the glyphosate anions interact through the carboxylate and/or phosphonate moieties, both in end-on and side-on modes to the LDO surface. Glyphosate removal was also investigated in the presence of different anionic species, and simultaneous adsorption showed that carbonate and phosphate ions strongly influence glyphosate removal.
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Affiliation(s)
- Emanoel Hottes
- Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
| | | | | | - Rosane Nora Castro
- Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
| | | | - Luan Pereira Camargo
- Departamento de Química, Universidade Estadual de Londrina, Londrina, PR, Brazil
| | | | - Marcelo Hawrylak Herbst
- Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil.
- Laboratório de Síntese Inorgânica e Materiais, Departamento de Química Fundamental, Instituto de Química, UFRRJ, BR465 km7, Seropédica, RJ, 23897-000, Brazil.
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Srivastava A, Dumpala RMR, Kumar P, Kumar R, Rawat N. Chemical and Redox Speciation of Uranyl with Three Environmentally Relevant Bifunctional Chelates: Multi-Technique Approach Combined with Theoretical Estimations. Inorg Chem 2022; 61:15452-15462. [PMID: 36123167 DOI: 10.1021/acs.inorgchem.2c01991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carbon and phosphorous are two primary elements common to the bio-geosphere and are omnipresent in both biotic and abiotic arenas. Phosphonate and carboxylate are considered as building blocks of glyphosate and humic substances and constituents of the cellular wall of bacteria and are the driving functionalities for most of the chemical interactions involving these two elements. Phosphonocarboxylates, a combination of both the functionalities in one moiety, are ideal models to dig deep into for understanding the chemical interactions of the two functional groups with metal ions. Phosphorous and carbon majorly exist as inorganic/organic phosphate and carboxylate, respectively, in the bio-geosphere. Aquatic contamination is a major concern for uranium, and the presence of complexing agents would alter the uranium concentrations in aquifers. Determination of solution thermodynamic parameters, speciation plots, redox patterns, Eh-pH diagrams, coordination structures, and molecular-level understanding by density functional theory calculations was carried out to interpret the uranyl (UO22+) interaction with three environmentally relevant phosphonocarboxylates, namely, phosphono-formic acid (PFA), phosphono-acetic acid (PAA), and phosphono-propanoic acid (PPA). UO22+ forms 1:1 complexes with the three phosphonocarboxylates in the monoprotonated form, having nearly the same stability, and the complexes [UO2(PFAH)], [UO2(PAAH)], and [UO2(PPAH)] involve chelate formation of five, six, and seven membered rings, respectively, through the participation of an oxygen each from the carboxylate and phosphonate, strengthened by an intra-molecular hydrogen bonding through the proton of the phosphonate moiety with uranyl oxygen. The complex formations are favored both enthalpically and entropically, with the latter being more contributive to the overall free energy of formation. The redox speciation showed an aqueous soluble complex formation over a wide pH range of 1-8. Electrospray ionization mass spectrometry and extended X-ray absorption fine structure established the coordination modes, which are further corroborated by density functional calculations. The knowledge gained from the present studies provide potential inputs in framing the cleanup, sequestering, microbial, and bio-remediation strategies for uranyl from aquatic environments.
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Affiliation(s)
- Ashutosh Srivastava
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Rama Mohana Rao Dumpala
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.,Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, P.O. Box 3640, Karlsruhe 76021, Germany
| | - Pranaw Kumar
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Ravi Kumar
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Neetika Rawat
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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Kimani M, Kislenko E, Gawlitza K, Rurack K. Fluorescent molecularly imprinted polymer particles for glyphosate detection using phase transfer agents. Sci Rep 2022; 12:14151. [PMID: 35986032 PMCID: PMC9391380 DOI: 10.1038/s41598-022-16825-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 07/18/2022] [Indexed: 01/19/2023] Open
Abstract
In this work, molecular imprinting was combined with direct fluorescence detection of the pesticide Glyphosate (GPS). Firstly, the solubility of highly polar GPS in organic solvents was improved by using lipophilic tetrabutylammonium (TBA+) and tetrahexylammonium (THA+) counterions. Secondly, to achieve fluorescence detection, a fluorescent crosslinker containing urea-binding motifs was used as a probe for GPS-TBA and GPS-THA salts in chloroform, generating stable complexes through hydrogen bond formation. The GPS/fluorescent dye complexes were imprinted into 2-3 nm fluorescent molecularly imprinted polymer (MIP) shells on the surface of sub-micron silica particles using chloroform as porogen. Thus, the MIP binding behavior could be easily evaluated by fluorescence titrations in suspension to monitor the spectral changes upon addition of the GPS analytes. While MIPs prepared with GPS-TBA and GPS-THA both displayed satisfactory imprinting following titration with the corresponding analytes in chloroform, GPS-THA MIPs displayed better selectivity against competing molecules. Moreover, the THA+ counterion was found to be a more powerful phase transfer agent than TBA+ in a biphasic assay, enabling the direct fluorescence detection and quantification of GPS in water. A limit of detection of 1.45 µM and a linear range of 5-55 µM were obtained, which match well with WHO guidelines for the acceptable daily intake of GPS in water (5.32 µM).
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Affiliation(s)
- Martha Kimani
- grid.71566.330000 0004 0603 5458Chemical and Optical Sensing Division (1.9), Bundesanstalt für Materialforschung und -prüfung (BAM), 12200 Berlin, Germany
| | - Evgeniia Kislenko
- grid.71566.330000 0004 0603 5458Chemical and Optical Sensing Division (1.9), Bundesanstalt für Materialforschung und -prüfung (BAM), 12200 Berlin, Germany
| | - Kornelia Gawlitza
- grid.71566.330000 0004 0603 5458Chemical and Optical Sensing Division (1.9), Bundesanstalt für Materialforschung und -prüfung (BAM), 12200 Berlin, Germany
| | - Knut Rurack
- grid.71566.330000 0004 0603 5458Chemical and Optical Sensing Division (1.9), Bundesanstalt für Materialforschung und -prüfung (BAM), 12200 Berlin, Germany
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Protonation of Chelidamic Acid: Thermodynamic Analysis and Crystal Structure. J SOLUTION CHEM 2022. [DOI: 10.1007/s10953-022-01164-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Garau A, Picci G, Bencini A, Caltagirone C, Conti L, Lippolis V, Paoli P, Romano GM, Rossi P, Scorciapino MA. Glyphosate sensing in aqueous solutions by fluorescent zinc(II) complexes of [9]aneN 3-based receptors. Dalton Trans 2022; 51:8733-8742. [PMID: 35612268 DOI: 10.1039/d2dt00738j] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we describe the binding abilities of Zn(II) complexes of [12]aneN4- (L1) and [9]aneN3-based receptors (L2, L3) towards the herbicides N-(phosphonomethyl)glycine (glyphosate, H3PMG) and 2-amino-4-[hydroxy(methyl)phosphoryl]butanoic acid (glufosinate, H2GLU), and also aminomethylphosphonic acid (H2AMPA), the main metabolite of H3PMG, and phosphate. All ligands form stable Zn(II) complexes, whose coordination geometries allow a possible interaction of the metal center with exogenous anionic substrates. Potentiometric studies evidenced the marked coordination ability of the L2/Zn(II) system for the analytes considered, with a preferential binding affinity for H3PMG over the other substrates, in a wide range of pH values. 1H and 31P NMR experiments supported the effective coordination of such substrates by the Zn(II) complex of L2, while fluorescence titrations and a test strip experiment were performed to evaluate whether the H3PMG recognition processes could be detected by fluorescence signaling.
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Affiliation(s)
- Alessandra Garau
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy.
| | - Giacomo Picci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy.
| | - Andrea Bencini
- Dipartimento di Chimica 'Ugo Schiff', Università degli Studi di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Claudia Caltagirone
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy.
| | - Luca Conti
- Dipartimento di Chimica 'Ugo Schiff', Università degli Studi di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy.
| | - Paola Paoli
- Dipartimento Ingegneria Industriale, Università degli Studi di Firenze, Via Santa Marta 3, Firenze 50139, Italy
| | - Giammarco Maria Romano
- Dipartimento di Chimica 'Ugo Schiff', Università degli Studi di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Patrizia Rossi
- Dipartimento Ingegneria Industriale, Università degli Studi di Firenze, Via Santa Marta 3, Firenze 50139, Italy
| | - Mariano Andrea Scorciapino
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy.
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Red-Emitting Polymerizable Guanidinium Dyes as Fluorescent Probes in Molecularly Imprinted Polymers for Glyphosate Detection. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10030099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
The development of methodologies to sense glyphosate has gained momentum due to its toxicological and ecotoxicological effects. In this work, a red-emitting and polymerizable guanidinium benzoxadiazole probe was developed for the fluorescence detection of glyphosate. The interaction of the fluorescent probe and the tetrabutylammonium salt of glyphosate was studied via UV/vis absorption and fluorescence spectroscopy in chloroform and acetonitrile. The selective recognition of glyphosate was achieved by preparing molecularly imprinted polymers, able to discriminate against other common herbicides such as 2,4-dichlorophenoxyacetic acid (2,4-D) and 3,6-dichloro-2-methoxybenzoic acid (dicamba), as thin layers on submicron silica particles. The limits of detection of 4.8 µM and 0.6 µM were obtained for the sensing of glyphosate in chloroform and acetonitrile, respectively. The reported system shows promise for future application in the sensing of glyphosate through further optimization of the dye and the implementation of a biphasic assay with water/organic solvent mixtures for sensing in aqueous environmental samples.
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Fliss O, Essalah K, Ben Fredj A. Stabilization of glyphosate zwitterions and conformational/tautomerism mechanism in aqueous solution: insights from ab initio and density functional theory-continuum model calculations. Phys Chem Chem Phys 2021; 23:26306-26323. [PMID: 34787605 DOI: 10.1039/d1cp03161a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, a comparative theoretical conformational analysis of the commercially most successful herbicide compound, glyphosate (N-phosphonomethylglycine), has been made at various quantum chemical levels of theory, in the gas phase and aqueous solution, using the integral equation-formalism polarizable continuum model (IEFPCM) and the solvation model density (SMD) approaches. The stable conformers of non-ionized (NE) and ionized or zwitterionic (ZW) neutral forms of glyphosate and the inter-conversions between them are described. Calculations revealed that several NE conformers of glyphosate exist in the gas phase but the zwitterionic form (ZW) is unstable in vacuo at all levels of theory. In aqueous solution, the stabilization of the zwitterion form of glyphosate was unable to be predicted satisfactorily within the equilibrated framework of the IEFPCM polarizable continuum model and using the standard UFF-radii cavity. However, the calculation with the density-based solvation model (SMD) was consistent with the experimental findings and led to the identification of the phosphonate zwitterionic (ZWP) structure as the global minimum energy in aqueous solution. The ZWP ⇋ NE tautomeric equilibrium between the non-ionized and zwitterionic forms of glyphosate was studied in aqueous solution at the SMD-B3LYP-D3/6-311++(2d,2p) level. Zwitterion formation in solution could occur by means of a concerted intramolecular proton transfer from the nitrogen to the oxygen of the phosphonate group. An analysis of the intermolecular mechanism shows that the addition of one water molecule favours the process either thermodynamically or kinetically. The possibility that the tautomerization process of glyphosate via a nonconcerted mechanism with zwitterion carboxylate (ZWC) as the intermediate can be excluded and the ZWP → ZWC proton transfer conversion can be a nearly barrierless process in PES and FES surfaces. comparison with similarly related biologically active systems was made.
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Affiliation(s)
- Outaf Fliss
- Unité de recherche de Modélisation en Sciences Fondamentales et Didactiques, équipe de Chimie Théorique et Réactivité UR14ES10, Institut Préparatoire aux études d'Ingénieurs d'El Manar, Université de Tunis El Manar, B.P. 244, El Manar II 2092, Tunis, Tunisie.
| | - Khaled Essalah
- Unité de recherche de Modélisation en Sciences Fondamentales et Didactiques, équipe de Chimie Théorique et Réactivité UR14ES10, Institut Préparatoire aux études d'Ingénieurs d'El Manar, Université de Tunis El Manar, B.P. 244, El Manar II 2092, Tunis, Tunisie.
| | - Arij Ben Fredj
- Unité de recherche de Modélisation en Sciences Fondamentales et Didactiques, équipe de Chimie Théorique et Réactivité UR14ES10, Institut Préparatoire aux études d'Ingénieurs d'El Manar, Université de Tunis El Manar, B.P. 244, El Manar II 2092, Tunis, Tunisie.
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Sadatsharifi M, Ingersoll DW, Purgel M. The fate of a hazardous herbicide: a DFT-based ab initio study on glyphosate degradation. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2021; 23:1018-1028. [PMID: 34288996 DOI: 10.1039/d1em00100k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Glyphosate degradation has been extensively examined; however, only a few detailed computational studies have been performed on the topic so far. There are substantial differences between the degradation products of glyphosate, as AMPA (aminomethylphosphonic acid) is toxic while sarcosine intermediate is non-toxic. These species can have different effects on the environment and, indirectly, on the human body. We performed calculations using density functional theory and post-Hartree-Fock correlated ab initio methods to find the possible mechanisms for the degradation process by small (hydroxyl, peroxyl, and superoxide) radicals. We found that direct sarcosine formation is strongly dependent on the concentration of the radical species. AMPA and glycine were mostly formed as aldehyde derivatives, while in addition to the former, glyoxylate and bicarbonate are formed alternatively. A significant pH effect was also found for the competitive reactions determined by the calculated rate constants of the elementary steps. Overall barriers showed similarities by DFT but ab initio methods could separate them.
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Affiliation(s)
| | - Daniel W Ingersoll
- St. Mary's College of Maryland, 47645 College Drive, St. Mary's City, MD 20686-3001, USA
| | - Mihály Purgel
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
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Jia D, Cai H, Duan Y, Xia J, Guo J. Efficient adsorption to hexavalent chromium by iron oxalate modified D301: Characterization, performance and mechanisms. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.06.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chen B, Liu B, He Y, Luo D, Mu W, Yang Y, Yang Y, Peng S, Li X. Complexation of Cyclic Glutarimidedioxime with Cerium: Surrogating for Redox Behavior of Plutonium. Inorg Chem 2021; 60:3139-3148. [PMID: 33576608 DOI: 10.1021/acs.inorgchem.0c03480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The complexation of cerium with glutarimidedioxime (H2L) was studied by potentiometry, ESI-mass spectrometry, and cyclic voltammetry. Crystallization of [CeIV(HL)3]+ from Ce3+ starting reactant indicated spontaneous complexation-driven oxidation. In aqueous solution, Ce3+ ions form three successive complexes, Ce(HL)2+, Ce(HL)2+, and Ce(HL)3 (where HL- stands for the singly deprotonated ligand). The interactions of glutarimidedioxime with metal ions are dominantly electrostatic in nature, and the stability constants of the complexes are correlated to the charge density of metal ions. Extrapolations of predicted stability constant (log β) values were made from plotting effective charge and the ionic radius of the metal ion for Pu3+ and Pu4+. The stability constants of PuIV(HL)3+ and PuIII(HL)2+ are estimated to be 27.74 and 19.75, respectively. The differences of stability constants mean that glutarimidedioxime selectively binds Pu4+ over Pu3+ by a factor of about 8 orders of magnitude, suggesting Pu4+ would be stabilized by chelation with glutarimidedioxime. The mechanism of reduction of Pu4+ to Pu3+ in acidic solution is explained by decomposition of glutarimidedioxime through acid hydrolysis rather than a chelation-driven mechanism.
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Affiliation(s)
- Baihua Chen
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Bijun Liu
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Yao He
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Daibing Luo
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Wanjun Mu
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Yuchuan Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Yanqiu Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Shuming Peng
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Xingliang Li
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
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Valle AL, Silva ACA, Dantas NO, Sabino-Silva R, Melo FCC, Moreira CS, Oliveira GS, Rodrigues LP, Goulart LR. Application of ZnO Nanocrystals as a Surface-Enhancer FTIR for Glyphosate Detection. NANOMATERIALS 2021; 11:nano11020509. [PMID: 33671396 PMCID: PMC7922178 DOI: 10.3390/nano11020509] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 11/16/2022]
Abstract
Glyphosate detection and quantification is still a challenge. After an extensive review of the literature, we observed that Fourier transform infrared spectroscopy (FTIR) had practically not yet been used for detection or quantification. The interaction between zinc oxide (ZnO), silver oxide (Ag2O), and Ag-doped ZnO nanocrystals (NCs), as well as that between nanocomposite (Ag-doped ZnO/AgO) and glyphosate was analyzed with FTIR to determine whether nanomaterials could be used as signal enhancers for glyphosates. The results were further supported with the use of atomic force microscopy (AFM) imaging. The glyphosate commercial solutions were intensified 10,000 times when incorporated the ZnO NCs. However, strong chemical interactions between Ag and glyphosate may suppress signaling, making FTIR identification difficult. In short, we have shown for the first time that ZnO NCs are exciting tools with the potential to be used as signal amplifiers of glyphosate, the use of which may be explored in terms of the detection of other molecules based on nanocrystal affinity.
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Affiliation(s)
- Anderson L. Valle
- Nanobiotechnology Laboratory, Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38402-022, MG, Brazil; (A.L.V.); (F.C.C.M.)
| | - Anielle C. A. Silva
- Laboratory of New Insulating and Semiconductors Materials, Institute of Physics, Federal University of Uberlândia, Uberlândia 38408-100, MG, Brazil;
- Laboratory of New Nanostructured and Functional Materials, Institute of Physics, Federal University of Alagoas, Maceió 57072-970, AL, Brazil
- Correspondence: (A.C.A.S.); (L.R.G.); Tel.: +82-3214-1000 (A.C.A.S.); +34-3225-8440 (L.R.G.)
| | - Noelio O. Dantas
- Laboratory of New Insulating and Semiconductors Materials, Institute of Physics, Federal University of Uberlândia, Uberlândia 38408-100, MG, Brazil;
- Laboratory of New Nanostructured and Functional Materials, Institute of Physics, Federal University of Alagoas, Maceió 57072-970, AL, Brazil
| | - Robinson Sabino-Silva
- Institute of Biomedical Sciences, Federal University of Uberlândia, Uberlândia 38402-022, MG, Brazil;
| | - Francielli C. C. Melo
- Nanobiotechnology Laboratory, Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38402-022, MG, Brazil; (A.L.V.); (F.C.C.M.)
| | - Cleumar S. Moreira
- Electrical Engineering Department, Federal Institute of Paraíba, João Pessoa 58015-020, PB, Brazil;
| | - Guedmiller S. Oliveira
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia 38402-022, MG, Brazil;
| | - Luciano P. Rodrigues
- Institute of Engineering, Science and Technology, Federal University of Jequitinhonha and Mucuri’s Valleys, Janaúba 39447-814, MG, Brazil;
| | - Luiz R. Goulart
- Nanobiotechnology Laboratory, Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38402-022, MG, Brazil; (A.L.V.); (F.C.C.M.)
- Correspondence: (A.C.A.S.); (L.R.G.); Tel.: +82-3214-1000 (A.C.A.S.); +34-3225-8440 (L.R.G.)
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Molecular Basis for Endocrine Disruption by Pesticides Targeting Aromatase and Estrogen Receptor. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17165664. [PMID: 32764486 PMCID: PMC7459580 DOI: 10.3390/ijerph17165664] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/01/2020] [Accepted: 08/03/2020] [Indexed: 12/22/2022]
Abstract
The intensive use of pesticides has led to their increasing presence in water, soil, and agricultural products. Mounting evidence indicates that some pesticides may be endocrine disrupting chemicals (EDCs), being therefore harmful for the human health and the environment. In this study, three pesticides, glyphosate, thiacloprid, and imidacloprid, were tested for their ability to interfere with estrogen biosynthesis and/or signaling, to evaluate their potential action as EDCs. Among the tested compounds, only glyphosate inhibited aromatase activity (up to 30%) via a non-competitive inhibition or a mixed inhibition mechanism depending on the concentration applied. Then, the ability of the three pesticides to induce an estrogenic activity was tested in MELN cells. When compared to 17β-estradiol, thiacloprid and imidacloprid induced an estrogenic activity at the highest concentrations tested with a relative potency of 5.4 × 10−10 and 3.7 × 10−9, respectively. Molecular dynamics and docking simulations predicted the potential binding sites and the binding mode of the three pesticides on the structure of the two key targets, providing a rational for their mechanism as EDCs. The results demonstrate that the three pesticides are potential EDCs as glyphosate acts as an aromatase inhibitor, whereas imidacloprid and thiacloprid can interfere with estrogen induced signaling.
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Zhu L, Liu B, Yang X, Zhuo L, Mu W, Chen Y, Yang Y, Wei H, Li X. Complexation of 1,3-Diamino-2-hydroxypropane-N,N,N',N'-tetraacetic Acid (DHPTA) with Heavy Lanthanides (Tb3+, Ho3+, Lu3+) in Aqueous Solution. J SOLUTION CHEM 2020. [DOI: 10.1007/s10953-020-00950-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Li X, Zhang Z, Liu B, Mu W, Yang Y, Martin LR, Luo S, Rao L. Complexation of Light Trivalent Lanthanides with N-(2-Hydroxyethyl)ethylenediamine- N, N', N'-triacetic Acid in Aqueous Solutions: Thermodynamic Analysis and Coordination Modes. Inorg Chem 2019; 58:15618-15628. [PMID: 31674777 DOI: 10.1021/acs.inorgchem.9b02706] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
N-(2-Hydroxyethyl)ethylenediamine-N,N',N'-triacetic acid (HEDTA, denoted as H3L) is a strong chelating ligand that is widely used in the separation of f elements as relevant to the nuclear fuel cycle. There is much to be known about the structure and composition of the coordination sphere of the complexes of HEDTA with lanthanides. The complexation of HEDTA with light lanthanides (La3+, Nd3+, and Eu3+) was investigated thermodynamically and structurally in aqueous solutions. Potentiometry and microcalorimetry were performed to acquire the complexation constants (25-70 °C) and enthalpies (25 °C), respectively, at I = 1.0 mol·L-1 NaClO4. Coordination modes of the complexes were analyzed by luminescence spectroscopy and NMR spectroscopy. The results indicate that there are two successive Ln3+/HEDTA complexes, LnLaq and Ln2(H-1L)22- (Ln3+ refers to La3+, Nd3+, and Eu3+; H-1L4- refers to deprotonation of the hydroxyl group) during titration. The hydroxyl group of HEDTA is coordinated in the Ln3+/HEDTA complex. The dinuclear Ln2(H-1L)22- complex is present as a carboxyl-bridged centrosymmetric dimer, and two carboxyl groups in bridging positions are coordinated to two adjacent Ln3+ cations. Complexation of NdLaq is exothermic, while formation of the hydrolytic complex Nd2(H-1L)22- is endothermic. Both NdLaq and Nd2(H-1L)22- complexes are driven by entropic force. These data will help to predict the behavior of lanthanides in the separation process, where HEDTA is used as the aqueous complexant.
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Affiliation(s)
- Xingliang Li
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang , Sichuan 621999 , China
| | - Zhicheng Zhang
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Bijun Liu
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang , Sichuan 621999 , China
| | - Wanjun Mu
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang , Sichuan 621999 , China
| | - Yuchuan Yang
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang , Sichuan 621999 , China
| | - Leigh R Martin
- Nuclear Security & Isotope Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Shunzhong Luo
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang , Sichuan 621999 , China
| | - Linfeng Rao
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
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19
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Páez MR, Ochoa-Muñoz Y, Rodriguez-Páez J. Efficient removal of a glyphosate-based herbicide from water using ZnO nanoparticles (ZnO-NPs). BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Abstract
The reactions of (N-(PhosphonoMethyl)Glycine) PMG with H2O2 in homogenous systems were investigated using 31P NMR (Nuclear Magnetic Resonance). These reactions were carried out in two reaction modes: without UV radiation and under UV radiation. The reactions of PMG with H2O2 without UV radiation were carried out in two modes: the degradations of PMG (0.1 mmol) by means of 5–10 molar excess of hydrogen dioxide (PMG-H2O2 = 1:5 and 1:10) and the degradation of PMG (0.1 mmol) in homogenous Fenton reactions (PMG-H2O2-Fe2+ = 1:10:0.05 and 1:10:0.1). All reactions were carried out at ambient temperature, at pH 3.5, for 48 h. The reactions of PMG (in Roundup herbicide composition, 12 mmol) with H2O2 under UV radiation (254 nm) were carried out using 5 × molar excess of H2O2 (60 mmol), in the pH range of 2 ≤ pH ≤ 12, for 6 h. In this mode of PMG oxidation, the splitting of C-P was observed in the ratios dependent on the applied pH of the reaction mixture.
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Cahuantzi‐Muñoz SL, González‐Fuentes MA, Ortiz‐Frade LA, Torres E, Ţălu Ş, Trejo G, Méndez‐Albores A. Electrochemical Biosensor for Sensitive Quantification of Glyphosate in Maize Kernels. ELECTROANAL 2019. [DOI: 10.1002/elan.201800759] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Selene L. Cahuantzi‐Muñoz
- Centro de Química-ICUAP Benemérita Universidad Autónoma de PueblaCiudad Universitaria Puebla 72530 Puebla México
| | | | - Luis A. Ortiz‐Frade
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica (CIDETEQ). Parque Tecnológico Sanfandila, Pedro Escobedo, A.P. 064, C.P. 76703 Querétaro México
| | - Eduardo Torres
- Centro de Química-ICUAP Benemérita Universidad Autónoma de PueblaCiudad Universitaria Puebla 72530 Puebla México
| | - Ştefan Ţălu
- Technical University of Cluj-NapocaThe Directorate of Research, Development and Innovation Management (DMCDI) Constantin Daicoviciu Street, No. 15 Cluj-Napoca 400020, Cluj county Romania
| | - G. Trejo
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica (CIDETEQ). Parque Tecnológico Sanfandila, Pedro Escobedo, A.P. 064, C.P. 76703 Querétaro México
| | - Alia Méndez‐Albores
- Centro de Química-ICUAP Benemérita Universidad Autónoma de PueblaCiudad Universitaria Puebla 72530 Puebla México
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22
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Chen W, Liu B, Mu W, Yu Q, Tian Y, Tu J, Li X, Yang Y, Wei H, Luo S. Complex formation of anserine with uranyl in aqueous solution: Thermodynamic studies and structural analysis. Microchem J 2018. [DOI: 10.1016/j.microc.2018.07.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Faria RR, Neto LRDS, Guerra RF, Junior MFF, Oliveira GS, Franca EF. Parameters for glyphosate in OPLS-AA force field. MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2018.1536294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Roberto R. Faria
- Chemistry Institute, Federal University of Uberlândia – UFU, Uberlândia, Brazil
| | | | - Renan F. Guerra
- Chemistry Institute, Federal University of Uberlândia – UFU, Uberlândia, Brazil
| | | | | | - Eduardo F. Franca
- Chemistry Institute, Federal University of Uberlândia – UFU, Uberlândia, Brazil
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24
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Abstract
Radiometals possess an exceptional breadth of decay properties and have been applied to medicine with great success for several decades. The majority of current clinical use involves diagnostic procedures, which use either positron-emission tomography (PET) or single-photon imaging to detect anatomic abnormalities that are difficult to visualize using conventional imaging techniques (e.g., MRI and X-ray). The potential of therapeutic radiometals has more recently been realized and relies on ionizing radiation to induce irreversible DNA damage, resulting in cell death. In both cases, radiopharmaceutical development has been largely geared toward the field of oncology; thus, selective tumor targeting is often essential for efficacious drug use. To this end, the rational design of four-component radiopharmaceuticals has become popularized. This Review introduces fundamental concepts of drug design and applications, with particular emphasis on bifunctional chelators (BFCs), which ensure secure consolidation of the radiometal and targeting vector and are integral for optimal drug performance. Also presented are detailed accounts of production, chelation chemistry, and biological use of selected main group and rare earth radiometals.
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Affiliation(s)
- Thomas I Kostelnik
- Medicinal Inorganic Chemistry Group, Department of Chemistry , University of British Columbia , Vancouver , British Columbia V6T 1Z1 , Canada
| | - Chris Orvig
- Medicinal Inorganic Chemistry Group, Department of Chemistry , University of British Columbia , Vancouver , British Columbia V6T 1Z1 , Canada
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25
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Lopes Catão AJ, López-Castillo A. On the degradation pathway of glyphosate and glycine. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2018; 20:1148-1157. [PMID: 29987286 DOI: 10.1039/c8em00119g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The degradation in water of the most widespread herbicide, glyphosate, is still under debate. Experimental disagreements on this process exist and there are only a few theoretical studies to support any conclusions. Moreover, the relationship between glyphosate and glycine is underestimated. Besides the structural similarity, glycine is a product of glyphosate degradation; hence, their studies are complementary. In this study, two mechanisms for the decomposition of the glyphosate molecule and glycine molecule in water are proposed. These mechanisms were explored by using quantum mechanical calculations. A combined microsolvation/PCM approach was employed to find and characterize their transition states, by which the reaction pathways were determined via the IRC method. The results have shown that the degradation processes might occur via a C-C bond cleavage, through a concerted mechanism, whereby the proton transfers and the CO2 detachments occur simultaneously. The second mechanism had two consecutive steps, a decarboxylation followed by the proton transfers. The water molecules served as a conduit for the proton transfers, away from the amine group (or the phosphonate, glyphosate case). Their function was to assist the reactions in a water-mediated decarboxylation. In these particular cases, the free energy of activation was 42.68 and 42.28 kcal mol-1 for the glycine structure and the glyphosate structure, respectively. These results agreed with the photodegradation and thermodegradation of glyphosate, as well as with the spontaneous decarboxylation of glycine. A concerted mechanism might be expected to yield C-P and C-N bond cleavages in the glyphosate molecule.
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Affiliation(s)
- Anderson José Lopes Catão
- Chemistry Department, Universidade Federal de São Carlos, Rod. Washington Luís km 235 - SP-310, São Carlos CEP 13565-905, Brazil.
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26
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Flores FM, Torres Sánchez RM, Dos Santos Afonso M. Some aspects of the adsorption of glyphosate and its degradation products on montmorillonite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:18138-18146. [PMID: 29691751 DOI: 10.1007/s11356-018-2073-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 04/17/2018] [Indexed: 06/08/2023]
Abstract
The most worldwide used herbicide is glyphosate, phosphonomethylglycine (PMG). Consequently, a significant amount of PMG, its metabolites (sarcosine, SAR, and aminomethylphosphonic acid, AMPA) and the degradation product, methylphosphonic acid (MPA), reaches the soil, which acts as final sink. Because clays are one of the most reactive components of soils, expansive clays such as montmorillonite (Mt) are used to retain agriculture contaminants with some success. In this work, as a preliminary step for the evaluation of the risk that PMG, SAR, AMPA, and MPA occurrence could have on the environment, their adsorption on Mt surface was performed. The adsorption process was analyzed at constant adsorbate concentrations and two pH values to take into account the different protonation states of the amino group. DTA, XRD, zeta potential measurements, and XPS were used to identify the interactions or association mechanisms with the clay surface, the entry of adsorbates into the Mt interlayer, and electric charge changes on the Mt surface, and evaluate the acid-base surface complex constants, respectively. The interlayer thickness in acid media indicated that adsorbates are able to enter the interlayer in planar form. Besides, for the Mt-PMG sample, some PMG molecules could be also inserted as a bilayer or with a tilt angle of 52.4° in the interlayer. However, in alkaline media, the interlayer thickness indicated that the adsorbate arrangement differed from that of acidic media where PMG and MPA could have more than one orientation. The surface complex deprotonation constants were determined for the =NH+2 ⇆ =NH+H+ process, being 3.0, 5.0, and 7.3 for PMG, AMPA, and SAR, respectively.
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Affiliation(s)
- Federico M Flores
- CETMIC (Centro de Tecnología en Minerales y Cerámica) CONICET-CCT La Plata-CICBA, Camino Centenario y 506, B1897ZCA, M. B. Gonnet, Argentina
| | - Rosa M Torres Sánchez
- CETMIC (Centro de Tecnología en Minerales y Cerámica) CONICET-CCT La Plata-CICBA, Camino Centenario y 506, B1897ZCA, M. B. Gonnet, Argentina.
| | - Maria Dos Santos Afonso
- Facultad de Ciencias Exactas y Naturales, Instituto de Química Física de los Materiales, Medio Ambiente y Energía, Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
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27
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28
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Yan W, Jing C. Molecular Insights into Glyphosate Adsorption to Goethite Gained from ATR-FTIR, Two-Dimensional Correlation Spectroscopy, and DFT Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:1946-1953. [PMID: 29353483 DOI: 10.1021/acs.est.7b05643] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Glyphosate (PMG) complexation on iron (hydr)oxides impacts its fate and transport in the environment. To decipher the molecular-level interfacial configuration and reaction mechanism of PMG on iron (hydr)oxides, the PMG protonation process, which influences the chemical and physical properties of PMG, was first determined using ATR-FTIR spectroscopy. The FTIR results reveal that the deprotonation occurs at carboxylate oxygen when pKa1< pH < pKa2, at phosphonate oxygen when pKa2< pH < pKa3, and at amino nitrogen when pH > pKa3. PMG complexation on goethite was investigated using in situ flow-cell ATR-FTIR, two-dimensional correlation spectroscopy (2D-COS), and density functional theory (DFT) calculations. The results indicate that the phosphonate group on PMG interacts with goethite to form inner-sphere complexes with multiple configurations depending on pH: binuclear bidentate (BB) and mononuclear bidentate (MB) without proton under acidic conditions (pH 5), mononuclear monodentate (MM) with proton and BB without proton at pH 6-8, and MM without proton under alkaline conditions (pH 9). Phosphate competition significantly impacted the PMG adsorption capacity and its interfacial configurations. As a result, the stability of the adsorbed PMG was impaired, as evidenced by its elevated leachability. These results improve our understanding of PMG-mineral interactions at the molecular level and have significant implications for risk assessment for PMG and structural analog pollutants.
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Affiliation(s)
- Wei Yan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
| | - Chuanyong Jing
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
- University of Chinese Academy of Sciences , Beijing 100049, China
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29
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Ahmed AA, Leinweber P, Kühn O. Unravelling the nature of glyphosate binding to goethite surfaces by ab initio molecular dynamics simulations. Phys Chem Chem Phys 2018; 20:1531-1539. [PMID: 29260152 DOI: 10.1039/c7cp06245a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Investigation of the interaction between glyphosate (GLP) and soil minerals is essential for understanding GLP's fate in the environment. Whereas GLP-goethite binding has been discussed extensively, the impact of water as well as of different goethite surface planes has not been studied yet. In this contribution, periodic density functional theory-based molecular dynamics simulations are applied to explore possible binding mechanisms for GLP with three goethite surface planes (010, 001, and 100) in the presence of water. The investigation included several binding motifs of monodentate (M) and bidentate (B) type. It was found that the binding stability increases in the order M@001 < M@010 < (2O + 2Fe) B@100 < M@100 < (1O + 2Fe) B@001 < (2O + 1Fe) B@010. This behavior has been traced to the presence of intramolecular H-bonds (HBs) in GLP as well as intermolecular HBs between GLP and water, GLP and goethite, and water and goethite. These interactions are accompanied by proton transfer from GLP to water and to goethite, and from water to goethite as well as water dissociation at the goethite surface. Further, it was observed that the OH- species can replace the adsorbed GLP at the goethite surface, which could explain the well-known drastic drop in GLP adsorption at high pH. The present results highlight the role of water in the GLP-goethite interaction and provide a molecular level perspective on available experimental data.
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Affiliation(s)
- Ashour A Ahmed
- Institute of Physics, University of Rostock, Albert-Einstein-Str. 23-24, D-18059 Rostock, Germany.
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Determination of Protonation Constants of O-Phospho-l-serine in Aqueous Solution: Potentiometry, Microcalorimetry, NMR Spectroscopy and Quantum Chemical Calculations. J SOLUTION CHEM 2017. [DOI: 10.1007/s10953-017-0696-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gros P, Ahmed A, Kühn O, Leinweber P. Glyphosate binding in soil as revealed by sorption experiments and quantum-chemical modeling. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 586:527-535. [PMID: 28236479 DOI: 10.1016/j.scitotenv.2017.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 02/01/2017] [Accepted: 02/01/2017] [Indexed: 06/06/2023]
Abstract
The herbicide glyphosate (GLP) is supposed to be rapidly degraded or adsorbed strongly by soil solids but findings in soil years after application and concentrations in waters above legal limits question a harmless disappearance. Therefore, we conducted batch sorption experiments with 23 thoroughly characterized arable surface soils, correlated isotherm coefficients with numerous inorganic and organic soil parameters, and investigated GLP-SOM-complexes by quantum-chemical modeling. The Freundlich sorption model yielded the best fits, and coefficients Kf and nf were correlated positively with the contents of clay/silt. The contents of organic C (Corg) and of the mass-spectrometrically determined SOM-compound classes carbohydrates, phenols/lignin monomers, lignin dimers, lipids, alkylaromatics, non-amide N and amides and sterols all were strongly positively correlated with the Freundlich coefficients. Quantum-chemical modeling showed that both GLP phosphonic and carboxylic functional groups interact similarly with the polar SOM functional groups via H-bond formation but the GLP phosphonic moiety is most important in the GLP-SOM-interaction. Moreover, the interaction mechanism between GLP and every modeled SOM-compound class was explored indicating the importance of the polarity, electron density, and site of attack of the SOM fragments in the GLP-SOM-interaction. Partial binding energies were combined to a total binding energy (EB,tot) of GLP to the SOM, considering the mass spectrometrically quantified compound classes for each individual soil sample. The resulting strongly positive correlation between the EB,tot and the Corg provided compelling new experimental-theoretical evidence for the importance of SOM on the GLP binding and its behavior in the environment. In conclusion, the multitude of binding mechanisms to clay minerals and organic colloids make the occurrence of free GLP rather unlikely but a leaching of GLP complexes via preferential flow path through soil and transfer to waterways rather likely.
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Affiliation(s)
- Peter Gros
- University of Rostock, Soil Science, Justus-von-Liebig-Weg 6, D-18059 Rostock, Germany.
| | - Ashour Ahmed
- University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, D-18051 Rostock, Germany; University of Cairo, Faculty of Science, Department of Chemistry, 12613 Giza, Egypt.
| | - Oliver Kühn
- University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, D-18051 Rostock, Germany.
| | - Peter Leinweber
- University of Rostock, Soil Science, Justus-von-Liebig-Weg 6, D-18059 Rostock, Germany.
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Thermodynamics of the Protonation of an Analogue of Glyphosate, N-(phosphonomethyl)-l-proline, in Aqueous Solutions. J SOLUTION CHEM 2017. [DOI: 10.1007/s10953-017-0620-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Xu J, Gu X, Guo Y, Tong F, Chen L. Adsorption behavior and mechanism of glufosinate onto goethite. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 560-561:123-130. [PMID: 27096492 DOI: 10.1016/j.scitotenv.2016.03.239] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 03/29/2016] [Accepted: 03/30/2016] [Indexed: 06/05/2023]
Abstract
The adsorption of glufosinate (GLU), a widely used herbicide similar to glyphosate (GLY), onto goethite was investigated as a function of the pH, ionic strength, background cations and anions, heavy metal ions and fulvic acids (FAs) by using batch adsorption experiments. In situ ATR-FTIR spectroscopy and density functional theory (DFT) calculations were carried out to characterize the molecular interactions between GLU and goethite surfaces. The macroscopic results indicated that an increasing pH exerted an adverse effect on GLU adsorption because of the electrostatic repulsion, and the adsorption was not sensitive to ionic strengths or background cation types, indicating that an inner-sphere surface complex was involved. GLU adsorption can be considerably depressed by PO4(3-), SO4(2-), and a high level of FA because of the competitive effect, while being enhanced by Cu(2+) with a maximum adsorption at approximately pH5 because of the metal ion bridging effect. Other examined divalent metal cations (Cd(2+), Zn(2+), and Pb(2+)) showed almost no effect on GLU adsorption, indicating weak interaction between them. ATR-FTIR spectra and the DFT calculations further proved that GLU was bonded to goethite surfaces through the formation of a monodentate mononuclear inner-sphere complex between the phosphinic moiety and surface Fe(III) centers under an acidic condition. The results showed that GLU had a similar adsorption mechanism to that of GLY onto goethite, but with a lower adsorption affinity, possibly exerting higher mobility and risk in soils.
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Affiliation(s)
- Jian Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163, Xianlin Ave., Nanjing, 210023, PR China; Department of Environmental Science and Engineering, Nanjing University Jinling College, 8, Xuefu Road, Nanjing, 210089, PR China.
| | - Xueyuan Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163, Xianlin Ave., Nanjing, 210023, PR China.
| | - Yong Guo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, 1, Xikang Road, Nanjing, 210098, PR China.
| | - Fei Tong
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163, Xianlin Ave., Nanjing, 210023, PR China.
| | - Liangyan Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163, Xianlin Ave., Nanjing, 210023, PR China.
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