Glyphosate detection: methods, needs and challenges

Valle, Anderson Luis do; Mello, Florencia Curi; Alves-Balvedi, Renata Pereira; Rodrigues, Luciano Pereira; Goulart, Luíz Ricardo

doi:10.1007/s10311-018-0789-5

Cited by 187 publications

(114 citation statements)

References 197 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Stock solutions containing either one or the two analytes at 200 mg/L in 0.1 M HCl were prepared. Acidification with HCl to pH 1 has been found to be necessary in the case of environmental samples since multivalent cations form stable complexes with GLP and AMPA, which are not derivatized [11,20,[25][26][27]32,33]. All standard and working solutions were stored at 4 • C in polypropylene material given that GLP binds to active sites on glass when it is not derivatized [22,24,27].…”

Section: Reagents and Solutionsmentioning

confidence: 99%

Evaluation and optimization of the derivatization reaction conditions of glyphosate and aminomethylphosphonic acid with 6‐aminoquinolyl‐N‐hydroxysuccinimidyl carbamate using reversed‐phase liquid chromatography

Fontàs

Sánchez

2020

J of Separation Science

View full text Add to dashboard Cite

Due to the polar and ionic characteristics of glyphosate and its main metabolite, aminomethylphosphonic acid, a derivatization reaction is required before performing liquid chromatographic determination of these compounds. In this study, reaction conditions using 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate as the derivatization reagent are assessed. A two-level full-factorial design is applied here to optimize the derivatization time (ranging from 0.5 to 20 min) and temperature (from 24 to 55 • C). It is found that neither of these two variables have a significant effect on the derivatization process and that the reaction is quantitatively achieved in a few seconds at room temperature (24 • C). The results obtained indicate that derivatization reaction with 6-aminoquinolyl-Nhydroxysuccinimidyl carbamate is achieved in milder conditions, with a faster kinetic reaction, than those required with the most conventional derivatization reagents used today, and the derivatives are more stable. It has been found that the most important parameter affecting the chromatographic separation is the pH of the mobile phase, as it has a significant effect on the retention time of the hydrolyzed excess of reagent. When ammonium acetate is used in the mobile phase, buffered solutions at pH around 5.0 are required. K E Y W O R D S 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate, aminomethylphosphonic acid, derivatization, glyphosate, reversed-phase liquid chromatography 1 INTRODUCTION Glyphosate (N-phosphonomethyl-glycine; GLP) is a broadspectrum systemic herbicide widely used as a crop desic-Article Related Abbreviations: AMPA, aminomethylphosphonic acid; AMQ, 6-aminoquinoline; AQC, 6-aminoquinolyl-N-hydroxysuccinimidyl Carbamate; FMOC, 9-fluorenylmethylchloroformate; GLP, glyphosate; OPA, o-phatalaldehyde; TFA, trifluoroacetic acid cant. It is one of the most commonly used herbicides in agriculture due to the development of glyphosate-resistant genetically modified crop varieties [1,2] and it is also widely applied for urban and residential weed control [3]. The global glyphosate market is projected to reach USD 12.54 billion by 2024, with a compound annual growth rate of 6.8% over the forecast period, from 2019 to 2024 [4]. GLP is considered to be nonpersistent in the environment as it degrades by microbial organisms in

show abstract

Section: Reagents and Solutionsmentioning

confidence: 99%

Evaluation and optimization of the derivatization reaction conditions of glyphosate and aminomethylphosphonic acid with 6‐aminoquinolyl‐N‐hydroxysuccinimidyl carbamate using reversed‐phase liquid chromatography

Fontàs

Sánchez

2020

J of Separation Science

View full text Add to dashboard Cite

show abstract

“…Different analytical methods previously employed to determine Glyp were comprehensively reviewed in the literature, [11][12][13] and most of them are based on chromatographic techniques. [14][15][16][17] These techniques are highly sensitive and can detect Glyp well below the defined guidelines in the targeted samples.…”

Section: Introductionmentioning

confidence: 99%

An Electrochemically Synthesized Nanoporous Copper Microsensor for Highly Sensitive and Selective Determination of Glyphosate

et al. 2020

View full text Add to dashboard Cite

A nanoporous copper (NPC) film was electrodeposited on a copper microelectrode, and the generated platform was investigated for electrochemical sensing of glyphosate (Glyp). The as-deposited NPC film was highly pure and crystalline according to results of energy dispersive spectroscopy and Xray diffraction experiments, respectively. Scanning electron microscopy images confirm the NPC films possess a highly porous morphology containing dendrite fractals, and the electrodeposition parameters, particularly potential (E d ) and time (t d ), exert a remarkable influence on the structure of the films. Such changes in the NPC morphology with E d and t d were also correlated with the electrochemical behavior investigated by cyclic voltammetry. In the presence of Glyp, the anodic oxidation is facilitated because copper ions diffuse easily through the pores of the NPC film and form a complex with the analyte at the electrode interface. On the other hand, as the amount of copper oxides decreases due to the formation of soluble Cu(II) complex with Glyp, less current is obtained during the reverse scan, allowing a relationship between the decrease in the cathodic current and the Glyp concentration to be established. The optimized NPC-modified Cu microelectrode showed very high sensitivity (14 nA nmol À 1 L), low detection limit (4 nmol L À 1 ), excellent reproducibility, and selective response for Glyp. The applicability of the sensor was demonstrated by detecting Glyp in river water samples.[a] Dr.

show abstract

“…Given the properties above-mentioned, maximum residue thresholds of glyphosate are established at the very low concentration especially for drinking water (0.1 μg/L or 0.6 nM, in European countries) [ 30 ]. Liquid chromatography and gas chromatography coupled to mass spectrometry are traditional methods for glyphosate analysis [ 31 , 32 , 33 ]. However, the ionic and water-soluble proprieties of glyphosate make the analysis by HPLC advantageous over GC [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Based Nanocomposites for Glyphosate Detection Using Surface Plasmon Resonance Sensor

Dubreuil

Peydecastaing

Vaca-Medina

et al. 2020

Sensors

View full text Add to dashboard Cite

This article describes an optical method based on the association of surface plasmon resonance (SPR) with chitosan (CS) film and its nanocomposites, including zinc oxide (ZnO) or graphene oxide (GO) for glyphosate detection. CS and CS/ZnO or CS/GO thin films were deposited on an Au chip using the spin coating technique. The characterization, morphology, and composition of these films were performed by Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and contact angle technique. Sensor preparation conditions including the cross-linking and mobile phase (pH and salinity) were investigated and thoroughly optimized. Results showed that the CS/ZnO thin-film composite provides the highest sensitivity for glyphosate sensing with a low detection limit of 8 nM and with high reproducibility. From the Langmuir-type adsorption model and the effect of ionic strength, the adsorption mechanisms of glyphosate could be controlled by electrostatic and steric interaction with possible formation of 1:1 outer-sphere surface complexes. The selectivity of the optical method was investigated with respect to the sorption of glyphosate metabolite (aminomethylphosphonic acid) (AMPA), glufosinate, and one of the glufonisate metabolites (3-methyl-phosphinico-propionic acid) (MPPA). Results showed that the SPR sensor offers a very good selectivity for glyphosate, but the competition of other molecules could still occur in aqueous systems.

show abstract

Glyphosate detection: methods, needs and challenges

Cited by 187 publications

References 197 publications

Evaluation and optimization of the derivatization reaction conditions of glyphosate and aminomethylphosphonic acid with 6‐aminoquinolyl‐N‐hydroxysuccinimidyl carbamate using reversed‐phase liquid chromatography

Evaluation and optimization of the derivatization reaction conditions of glyphosate and aminomethylphosphonic acid with 6‐aminoquinolyl‐N‐hydroxysuccinimidyl carbamate using reversed‐phase liquid chromatography

An Electrochemically Synthesized Nanoporous Copper Microsensor for Highly Sensitive and Selective Determination of Glyphosate

Chitosan-Based Nanocomposites for Glyphosate Detection Using Surface Plasmon Resonance Sensor

Contact Info

Product

Resources

About