Ligand exchange reactions on citrate-gold nanoparticles for a parallel colorimetric assay of six pesticides

Rana, Kirankumar; Bhamore, Jigna R.; Rohit, Jigneshkumar V.; Park, Tae Jung; Kailasa, Suresh Kumar

doi:10.1039/c8nj01294f

Cited by 32 publications

(9 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…citrate is often used as intermediate ligand to functionalize NP 43,44 , it is easily exchanged to thiolated ligands and, recently, it has been also shown that it can be displaced by other non-covalent capping agents 45 , such, for instance, adenine 46 .…”

Section: Role Of Ligand On Aunp-liposomes Interactionmentioning

confidence: 99%

Shedding light on membrane-templated clustering of gold nanoparticles

Montis

Caselli

Valle³

et al. 2020

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

CRediT author statementCostanza Montis: Conceptualization, design of experiments, optical spectroscopy, QCM (PSCMlab), SANS (ILL), XRR (ESRF), SAXS and AFM investigations, analysis and interpretation of data; Original draft preparation, Writing original draft. Lucrezia Caselli: design of experiments; optical spectroscopy, SAXS, QCM (PSCMlab) and AFM investigation; analysis and interpretation of data; Original draft preparation. Francesco Valle: AFM and XRR (ESRF) investigation, data analysis and interpretation. Andrea Zendrini: SANS Investigation (ILL). Francesco Carlà: XRR investigation (ESRF), XRR data analysis and interpretation. Ralf Schweins: SANS investigation (ILL), SANS data analysis and interpretation. Marco Maccarini: SANS investigation (ILL), SANS data analysis and interpretation.

show abstract

Section: Role Of Ligand On Aunp-liposomes Interactionmentioning

confidence: 99%

Shedding light on membrane-templated clustering of gold nanoparticles

Montis

Caselli

Valle³

et al. 2020

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…In the presence of pesticide residues and HCl (2 M), the inter-particle distance is reduced and the peak absorbance redshifts, resulting in a broadening of the absorption spectra (~650 nm). This can be explained by the displacement of citrate ions from the surface, shielding the repulsive forces between particles 36 . Furthermore, the addition of HCl lowers the pH of the surrounding medium, reducing the repulsive forces further.…”

Section: Resultsmentioning

confidence: 99%

Handheld SERS coupled with QuEChERs for the sensitive analysis of multiple pesticides in basmati rice

et al. 2022

View full text Add to dashboard Cite

Pesticides are a safety issue globally and cause serious concerns for the environment, wildlife and human health. The handheld detection of four pesticide residues widely used in Basmati rice production using surface-enhanced Raman spectroscopy (SERS) is reported. Different SERS substrates were synthesised and their plasmonic and Raman scattering properties evaluated. Using this approach, detection limits for pesticide residues were achieved within the range of 5 ppb-75 ppb, in solvent. Various extraction techniques were assessed to recover pesticide residues from spiked Basmati rice. Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERs) acetate extraction was applied and characteristic spectral data for each pesticide was obtained from the spiked matrix and analysed using handheld-SERS. This approach allowed detection limits within the matrix conditions to be markedly improved, due to the rapid aggregation of nanogold caused by the extraction medium. Thus, detection limits for three out of four pesticides were detectable below the Maximum Residue Limits (MRLs) of 10 ppb in Basmati rice. Furthermore, the multiplexing performance of handheld-SERS was assessed in solvent and matrix conditions. This study highlights the great potential of handheld-SERS for the rapid on-site detection of pesticide residues in rice and other commodities.

show abstract

“…However, the continuous excessive and uncontrolled use of these pesticides would result in residues of OPs in food substrates (vegetables and fruits) or environmental substrates, such as soil and water. The residues in crops would cause their accumulation in the human body due to the bioaccumulation property of OPs, thus resulting in an irreversible damage to various organs, such as the nervous system, reproductive system, and digestive system. , A variety of analytical methods have been developed for OPs detection, including chromatography, enzyme-linked immunoassay (ELISA), colorimetry, fluorescence assay (FL), and electrochemistry (EC) . Chromatographic analysis has a high accuracy and sensitivity, but it requires specialized instruments and a cumbersome sample pretreatment process, which are costly and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Moderator-Powered Ratiometric Electrochemiluminescence Enzymatic Biosensors for Detecting Organophosphorus Pesticides Based on Dual-Signal Combined Nanoprobes

Zhao

et al. 2021

Anal. Chem.

View full text Add to dashboard Cite

The bifunctional moderator is urgently needed in the field of ratiometric electrochemiluminescence (ECL) sensing since it can mediate simultaneously two ECL signals to conveniently realize their opposite change trend. This work designed a novel dual-signal combined nanoprobe with carboxyl-functionalized poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1′,3}-thiadazole)] nanoparticles (c-PFBT NPs) as the anodic ECL probe and L-cysteine capped CdS quantum dots (L-CdS QDs) as the cathodic ECL probe, which performed a dual-signal output capability without any additional coreactants. More importantly, hydrogen peroxide (H2O2) produced in situ by enzyme-catalyzed reaction was developed as a bifunctional moderator for simultaneously regulating two signals. The dual-signal combined nanoprobe (c-PFBT NPs@CdS QDs) served as the matrix to immobilize acetylcholinesterase (AChE) and choline oxidase for organophosphorus (OPs) analysis. In the absence of OPs, H2O2 was produced by catalyzing the substrate acetylthiocholine (ATCl) with enzymes and it quenched the anodic ECL signal from c-PFBT NPs and simultaneously promoted the cathodic ECL signal from L-CdS QDs. When OPs was present, the activity of AChE was inhibited, the anodic signal would increase, and the cathodic signal would accordingly decrease. The integration of the bifunctional moderator H2O2 and dual-signal combined nanoprobe c-PFBT NPs@CdS QDs not only provides an attractive ECL platform for enzymatic sensing involving the generation or consumption of H2O2 but also paves a new pathway for other ratiometric ECL systems involving enzyme catalytic amplification for detecting antigens, antibodies, DNA, RNA, etc.

show abstract

Ligand exchange reactions on citrate-gold nanoparticles for a parallel colorimetric assay of six pesticides

Abstract: A rapid parallel colorimetric method was developed for identification of six pesticides (acephate, phenthoate, profenofos, acetamiprid, chlorothalonil and cartap) via ligand exchange reactions on citrate-gold nanoparticles.

Cited by 32 publications

References 49 publications

Shedding light on membrane-templated clustering of gold nanoparticles

Shedding light on membrane-templated clustering of gold nanoparticles

Handheld SERS coupled with QuEChERs for the sensitive analysis of multiple pesticides in basmati rice

Bifunctional Moderator-Powered Ratiometric Electrochemiluminescence Enzymatic Biosensors for Detecting Organophosphorus Pesticides Based on Dual-Signal Combined Nanoprobes

Contact Info

Product

Resources

About