Mg<sup>2+</sup> ion as a tuner for colorimetric sensing of glyphosate with improved sensitivity via the aggregation of 2-mercapto-5-nitrobenzimidazole capped silver nanoparticles

Rawat, Karuna A.; Majithiya, Rutuben P.; Rohit, Jigneshkumar V.; Basu, Hirakendu; Singhal, R. K.; Kailasa, Suresh Kumar

doi:10.1039/c6ra06450g

Cited by 43 publications

(19 citation statements)

References 42 publications

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“…Another simple colorimetric assay was developed for the selective detection of glyphosate in water and food samples via the aggregation of 2-mercapto-5-nitrobenzimidazole (MNBZ) capped silver nanoparticles using Mg (II) ions as a tuner and trigger [148]. Initially, AgNPs were synthesized with sodium borohydrate as a reducing agent and capped with MNBZ which showed a yellow color.…”

Section: Pesticidesmentioning

confidence: 99%

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

2020

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This review provides an up-to-date overview on silver nanoparticles-based materials suitable as optical sensors for water pollutants. The topic is really hot considering the implications for human health and environment due to water pollutants. In fact, the pollutants present in the water disturb the spontaneity of life-related mechanisms, such as the synthesis of cellular constituents and the transport of nutrients into cells, and this causes long / short-term diseases. For this reason, research continuously tends to develop always innovative, selective and efficient processes / technologies to remove pollutants from water. In this paper we will report on the silver nanoparticles synthesis, paying attention to the stabilizers and mostly used ligands, to the characterizations, to the properties and applications as colorimetric sensors for water pollutants. As water pollutants our attention will be focused on several heavy metals ions, such as Hg(II), Ni(II),Cu(II), Fe(III), Mn(II), Cr(III/V) Co(II) Cd(II), Pb(II), due to their dangerous effects on human health. In addition, several systems based on silver nanoparticles employed as pesticides colorimetric sensors in water will be also discussed. All of this with the aim to provide to readers a guide about recent advanced silver nanomaterials, used as colorimetric sensors in water.

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Section: Pesticidesmentioning

confidence: 99%

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

2020

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“…However, the Ag NPs hosted in SiO 2 have certain drawbacks in relation to their stability. This situation has spurred the study of alternatives allowing viability for technological applications such as their immobilization in a physical support such as a polymer matrix [ 68 , 69 ] and additional reducing agents or capping agents [ 70 ]. Polymers displaying antimicrobial properties are the subject of significant attention for their potential technical and medical applications [ 71 , 72 , 73 , 74 ].…”

Section: Introductionmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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COVID-19, as the cause of a global pandemic, has resulted in lockdowns all over the world since early 2020. Both theoretical and experimental efforts are being made to find an effective treatment to suppress the virus, constituting the forefront of current global safety concerns and a significant burden on global economies. The development of innovative materials able to prevent the transmission, spread, and entry of COVID-19 pathogens into the human body is currently in the spotlight. The synthesis of these materials is, therefore, gaining momentum, as methods providing nontoxic and environmentally friendly procedures are in high demand. Here, a highly virucidal material constructed from SiO2-Ag composite immobilized in a polymeric matrix (ethyl vinyl acetate) is presented. The experimental results indicated that the as-fabricated samples exhibited high antibacterial activity towards Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as well as towards SARS-CoV-2. Based on the present results and radical scavenger experiments, we propose a possible mechanism to explain the enhancement of the biocidal activity. In the presence of O2 and H2O, the plasmon-assisted surface mechanism is the major reaction channel generating reactive oxygen species (ROS). We believe that the present strategy based on the plasmonic effect would be a significant contribution to the design and preparation of efficient biocidal materials. This fundamental research is a precedent for the design and application of adequate technology to the next-generation of antiviral surfaces to combat SARS-CoV-2.

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“…For colorless, non-fluorescent and redox-inactive analytes, such methods are usually realized in such a way that the analyte interacts or reacts with a probe, indicator, or mediator, thus modulating the latter's spectroscopic or redox behavior. Whereas electrochemical detection is in most cases indirect, the direct photoluminescence detection of GPS has been achieved by utilizing carbon dots [15][16][17][18], quantum dots [19,20], gold nanomaterials [21][22][23][24], or various other nanoparticles [25][26][27] with luminescence emission of between 350 and 615 nm. However, reports are scarce regarding the detection of GPS with fluorescent molecular probes [14,28,29], although the latter is perhaps the most straightforward way of directly translating a binding event of a small molecule into a measurable signal, allowing for sensitive detection [28,29].…”

Section: Introductionmentioning

confidence: 99%

Red-Emitting Polymerizable Guanidinium Dyes as Fluorescent Probes in Molecularly Imprinted Polymers for Glyphosate Detection

et al. 2022

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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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Mg²⁺ ion as a tuner for colorimetric sensing of glyphosate with improved sensitivity via the aggregation of 2-mercapto-5-nitrobenzimidazole capped silver nanoparticles

Abstract: The sensitivity of MNBZ-Ag NPs was greatly improved by integrating Mg2+ ion as trigger that can capture the glyphosate at nanomolar concentration with high selectivity.

Cited by 43 publications

References 42 publications

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Red-Emitting Polymerizable Guanidinium Dyes as Fluorescent Probes in Molecularly Imprinted Polymers for Glyphosate Detection

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Mg2+ ion as a tuner for colorimetric sensing of glyphosate with improved sensitivity via the aggregation of 2-mercapto-5-nitrobenzimidazole capped silver nanoparticles

Abstract: The sensitivity of MNBZ-Ag NPs was greatly improved by integrating Mg2+ ion as trigger that can capture the glyphosate at nanomolar concentration with high selectivity.

Cited by 43 publications

References 42 publications

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Red-Emitting Polymerizable Guanidinium Dyes as Fluorescent Probes in Molecularly Imprinted Polymers for Glyphosate Detection

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Mg²⁺ ion as a tuner for colorimetric sensing of glyphosate with improved sensitivity via the aggregation of 2-mercapto-5-nitrobenzimidazole capped silver nanoparticles