Functionalized gold nanoparticles for sensing of pesticides: A review

Tseng, Wei‐Bin; Hsieh, Ming‐Mu; Chen, Che-Hsie; Chiu, Tai-Chia; Tseng, Wei‐Lung

doi:10.38212/2224-6614.1092

Cited by 24 publications

(9 citation statements)

References 165 publications

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“…Therefore, simple, rapid, low-cost approaches are still needed to facilitate routine pesticide analysis more conveniently. Colorimetric approaches are simple, cost-effective, and highly selective for determining pesticides compared to other approaches [ 11 , 12 , 13 , 14 ]. The obvious color changes in the sensing probes enable direct observation with the naked eyes upon the addition of target analytes.…”

Section: Introductionmentioning

confidence: 99%

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%

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

Zhou

Chang

et al. 2022

Biosensors

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“…On the other hand, toxins and pesticides can be detected using limited ligands such as DNA aptamers, enzyme cholinesterase, and antibodies. − In addition, various detection methods other than colorimetric changes, such as fluorescence, surface-enhanced Raman scattering (SERS), and electrochemical strategies, are used. , Therefore, more examples of specific ligand designs and mechanisms are required to further develop colorimetric sensors for the detection of toxins and pesticides using AuNPs.…”

Section: Discussionmentioning

confidence: 99%

Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Cho

Jung

Heo

et al. 2023

ACS Appl. Mater. Interfaces

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Gold nanoparticles (AuNPs) are useful nanomaterials as transducers for colorimetric sensors because of their high extinction coefficient and ability to change color depending on aggregation status. Therefore, over the past few decades, AuNP-based colorimetric sensors have been widely applied in several environmental and biological applications, including the detection of water pollutants. According to various studies, water pollutants are classified into heavy metals or cationic metal ions, toxins, and pesticides. Notably, many researchers have been interested in AuNP that detect water pollutants with high sensitivity and selectivity, while offering no adverse environmental issues in terms of AuNP use. This review provides a representative overview of AuNP-based colorimetric sensors for detecting several water pollutants. In particular, we emphasize the advantages of AuNP as colorimetric transducers for water pollutant detection in terms of their low toxicity, high stability, facile processability, and unique optical properties. Next, we discuss the status quo and future prospects of AuNP-based colorimetric sensors for the detection of water pollutants. We believe that this review will promote research and development of AuNP as next-generation colorimetric transducers for water pollutant detection.

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“…DNA oligonucleotides have various applications in antisense delivery, biosensing, catalysis, and nanomaterial assembly . Spherical nucleic acids (SNAs) are interesting structures made of a high density of DNA or RNA oligonucleotides attached to a nanoparticle core, such as a gold nanoparticle (AuNP). − The very high extinction coefficient of AuNPs allows visual observation of AuNPs at a low particle concentration. We previously showed that SNAs can strongly adsorb onto various materials’ surfaces, including a few microplastics, due to polyvalent DNA binding interactions. − …”

Section: Introductionmentioning

confidence: 99%

Spherical DNA for Probing Wettability of Microplastics

et al. 2023

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Wettability of microplastics may change due to chemical or physical transformations at their surface. In this work, we studied the adsorption of spherical nucleic acids (SNAs) with a gold nanoparticle core and linear DNA of the same sequence to probe the wettability of microplastics. Soaking microplastics in water at room temperature for 3 months resulted in the enhancement of SNA adsorption capacity and affinity, whereas linear DNA adsorption was the same on the fresh and soaked microplastics. Drying of the soaked microplastics followed by rehydration decreased the adsorption of the SNA, suggesting that the effect of soaking was reversible and related to physical changes instead of chemical changes of the microplastics. Raman spectroscopy data also revealed no chemical transformations of the soaked microplastics. Heating of microplastics over a short period induced a similar effect to long-term soaking. We propose that soaking or heating removes air entrapped in the nanosized pores at the water–plastic interface, increasing the contact surface area of the SNA to afford stronger adsorption. However, such wetted porosity would not change the adsorption of linear DNA because of its much smaller size.

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Functionalized gold nanoparticles for sensing of pesticides: A review

Cited by 24 publications

References 165 publications

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

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

Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Spherical DNA for Probing Wettability of Microplastics

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