A dual-mode nanoprobe for the determination of parathion methyl based on graphene quantum dots modified silver nanoparticles

Li, Yuan; Chen, Shujun; Lin, Daiqin; Chen, Zongbao; Qiu, Ping

doi:10.1007/s00216-020-02773-8

Cited by 21 publications

(8 citation statements)

References 30 publications

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“…AgNPs possess high extinction coefficients and strongly localized surface plasmon resonances in the visible region, which are very sensitive to the size, shape, and surrounding chemical environment [ 15 ]. Thus, AgNPs functionalized with various molecules can be used as colorimetric sensors and have been successfully used for detecting various target pesticides [ 18 , 19 , 20 , 21 , 22 , 23 ]. The sensing principle depends on the dramatic color change by the aggregation of AgNPs.…”

Section: Introductionmentioning

confidence: 99%

“…Chadha et al [ 21 ] developed a colorimetric and Raman spectroscopy sensor for detecting trace chlorpyrifos using γ-cyclodextrin-capped AgNPs. Graphene quantum dots have been used to cap on the AgNPs and as sensors for sensing glyphosate [ 22 ] and parathion methyl [ 23 ]. Chen et al [ 24 ] developed a rapid colorimetric detection of terbuthylazine and dimethoate based on citrate-stabilized AuNPs.…”

Section: Introductionmentioning

confidence: 99%

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Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Zhou

Chang

et al. 2022

Biosensors

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Sodium alginate (SA) was used to functionalize the surfaces of silver nanoparticles (AgNPs) to form SA-AgNPs for sensing dimethoate with a rapid and sensitive visual readout. UV–Vis spectrophotometry, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and zeta potential measurements were used to characterize SA-AgNPs that were synthesized under the ideal conditions. SA-AgNPs were spherical with an average size of 14.6 nm. The stability of SA-AgNPs was investigated with changes in pH, salinity, and storage time. This colorimetric assay of dimethoate relied on the change in the absorption ratio (A475/A400) of SA-AgNPs, resulting in their aggregation caused by dimethoate, leading to a visual change for SA-AgNPs from yellow to pale yellow. As a result, the absorption ratio (A475/A400) of SA-AgNPs showed good linearity in the range of 0.05 to 2.0 ppm (R2 = 0.9986) with a limit of detection (LOD) of 30 ppb. Adding other pesticides did not significantly change the absorption ratio of SA-AgNPs, indicating its high selectivity as a colorimetric assay. The sensor was successfully used to detect dimethoate in actual water samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Zhou

Chang

et al. 2022

Biosensors

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“…However, the average fluorescence lifetimes of PCN-224 did not change much in the presence of AgNPs [the fluorescence lifetimes (τ) of PCN-224, PCN-224 + 100 μL AgNPs, PCN-224 + 200 μL AgNPs, and PCN-224 + 300 μL AgNPs were 9.618, 9.561, 9.563, and 9.531 ns, respectively], as shown in Figure S3B. These results indicated that the fluorescence quenching efficiency was independent of the distance, and therefore there was no energy transfer between PCN-224 and AgNPs . In contrast, the excitation spectrum of PCN-224 highly overlapped with the wide absorption band of AgNPs (Figure B).…”

Section: Resultsmentioning

confidence: 95%

“…As illustrated in Figure S3A These results indicated that the fluorescence quenching efficiency was independent of the distance, and therefore there was no energy transfer between PCN-224 and AgNPs. 34 In contrast, the excitation spectrum of PCN-224 highly overlapped with the wide absorption band of AgNPs (Figure 4B). In addition, as shown in Figure 4C, it can be seen clearly that the fluorescence lifetimes have barely changed (PCN-224, τ ave = 9.618 ns and AgNPs@PCN-224, τ ave = 9.499 ns).…”

Section: Characterization Of Pcn-224 and Agnps@pcn-224mentioning

confidence: 91%

Ultrasensitive Fluorescence Platform Based on AgNPs In Situ-Incorporated Zr-MOFs for the Detection of Organophosphorus Pesticides

Wang,

Pan,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Organophosphorus pesticides (OPPs) are extensively used in agricultural production, and the contamination caused by their residues has raised significant concerns regarding potential threats to human health. Herein, a novel fluorescence nanoprobe based on an enzyme-mediated silver nanoparticle-modified metal organic framework (AgNPs@PCN-224) was successfully prepared for the rapid detection of OPPs. Initially, AgNPs@PCN-224 were synthesized by reducing silver nitrate (AgNO3) using sodium borohydride (NaBH4) embedded into luminescent PCN-224. This triggered the inner filter effect, leading to fluorescence quenching. Meanwhile, under the catalysis of acetylcholinesterase (AChE) and choline oxidase (CHO), acetylcholine (ATCh) was decomposed to hydrogen peroxide (H2O2), which could destroy AgNPs to form Ag+ released from PCN-224 for fluorescence recovery. Instead, fenitrothion, an OPP, inhibited AChE activity, allowing the quenched fluorescence to be reactivated. Under the current optimum conditions, the fluorescence intensity had a good correlation (Y = −728.5370X + 2178.4248, R 2 = 0.9869) over a dynamic range of fenitrothion concentrations from 0.1 to 500 ng/mL, with an LOD of 0.037 ng/mL. In addition, the anti-interference ability and robustness of the proposed sensor was verified for the monitoring of fenitrothion in tea with recoveries of 87.67–103.72% and the relative standard deviations (RSD) < 5.43%, indicating that the system has excellent prospects for OPP determination in practical applications. Furthermore, this work provides a universal platform for screening other enzyme inhibitors to detect OPPs.

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“…As shown in Figure 2C, the absorption spectra of p-NP overlapped with the emission spectra of CTAB-Cu NPs, which initially suggested that it might be due to the internal filtration effect (IFE) or FRET. 49,50 The fluorescence lifetimes of CTAB-Cu NPs were significantly reduced in the presence of p-NP (Figure 2D). The phenomenon suggests dynamic quenching between CTAB-Cu NPs and p-NP, thereby excluding the possibility of IFE mechanism.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Multifunctional Probe Based on CTAB-Cu Nanoparticles for Fluorescence and Colorimetric Dual-Read-Out Determination of p-Nitrophenol and Glyphosate

Wang

Peng

et al. 2023

ACS Sustainable Chem. Eng.

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The quantitative analysis of glyphosate has significant implications for the evaluation of food quality and environmental safety risks. First, copper nanoparticles (Cu NPs) were synthesized using cetyltrimethylammonium bromide (CTAB) as a stabilizing agent, which resolved the limitation associated with atmospheric oxidation of Cu NPs and provided excellent fluorescence stability. Interestingly, the fluorescence of blue-emitting CTAB-Cu NPs was quenched by pH-responsive p-nitrophenol (p-NP) via Forster resonance energy transfer. Herein, a dual read-out sensor based on CTAB-Cu NPs and p-NP was constructed for glyphosate detection. Specifically, acetic acid (HAc) from acetylcholine (ACh) via hydrolysis catalyzed by acetyl cholinesterase (AChE) reduced the pH of the mixed solution and prevented the loss of protons from p-NP, which allowed the fluorescence emission by CTAB-Cu NPs. The presence of glyphosate inhibited the activity of AChE, and the increased pH resulted in proton loss. The fluorescence intensity of CTAB-Cu NPs was quenched, and the solution color changed from colorless to yellow with a UV absorption peak at 400 nm. The sensor can detect ultra-trace levels of glyphosate residues with a limit of detection of 5.43 ng/L. The obtained biosensor was successfully utilized to monitor the degradation of glyphosate in the roots of cabbage and cultivated soil.

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A dual-mode nanoprobe for the determination of parathion methyl based on graphene quantum dots modified silver nanoparticles

Cited by 21 publications

References 30 publications

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Ultrasensitive Fluorescence Platform Based on AgNPs In Situ-Incorporated Zr-MOFs for the Detection of Organophosphorus Pesticides

Multifunctional Probe Based on CTAB-Cu Nanoparticles for Fluorescence and Colorimetric Dual-Read-Out Determination of p-Nitrophenol and Glyphosate

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