Fig 4 - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Content may be subject to copyright.
![Diagrams of colorimetric sensor array and detection principle of Organophosphorus pesticides based on unmodified AuNPs. Reproduced with permission from Ref. [103].](publication/347322123/figure/fig4/AS:971764792311811@1608698189576/Diagrams-of-colorimetric-sensor-array-and-detection-principle-of-Organophosphorus.jpg)
Diagrams of colorimetric sensor array and detection principle of Organophosphorus pesticides based on unmodified AuNPs. Reproduced with permission from Ref. [103].
Source publication
Pesticides are a family of non-biodegradable chemical compounds which widely used in agriculture to control pests and increase yield production. However, overuse or abuse of pesticides and their metabolites may cause potential toxicity for the environment as well as human health and all other living organisms, even at deficient concentrations. Cons...
Similar publications
Raman spectroscopy is an important method for studying the configuration of Ru bipyridyl dyes on TiO2. We studied the [Ru(II)(4,4′-COOH-2,2′-bpy)2(NCS)2)] dye (N3) adsorbed on a (TiO2)5 nanoparticle using Density Functional Theory, DFT, to optimize the geometry of the complex and to simulate normal Raman scattering, NRS, for the isolated N3 and the...
Surface‐enhanced Raman scattering (SERS) based on 2D semiconductors has been rapidly developed due to their chemical stability and molecule‐specific SERS activity. High signal reproducibility is urgently required towards practical SERS applications. 2D gallium nitride (GaN) with highly polar Ga–N bonds enables strong dipole–dipole interactions with...
Titanium dioxide (TiO2) is an excellent candidate material for semiconductor metal oxide-based substrates for surface-enhanced Raman scattering (SERS). Biotemplated fabrication of TiO2 thin films with a 3D network is a promising route for effectively transferring the morphology and ordering of the template into the TiO2 layer. The control over the...
We report on the first experimental observation of stimulated Raman scattering (SRS), stimulated low-frequency Raman scattering and multiphoton excited negatively-charged single nitrogen-vacancy (NV-) centers luminescence in ethanol suspension of submicron diamond particles obtained at high pressures and temperatures (HPHT). The Stokes and anti-Sto...
Single crystals of 0.75(Na0.5Bi0.5)TiO3-0.25(Sr0.7Ca0.3)TiO3 (NBT-25SCT) were grown by top seeded solid state crystal growth. X-ray diffraction of a polycrystalline ceramic sample and Raman scattering of a single crystal reveal that rhombohedral symmetry is predominant in the structure. The relative permittivity curves of (001), (110) and (111)-ori...
Citations
... Gold nanoparticles are the most studied nanometal because they have unique optical, physical, and catalytic properties. In addition, the biocompatibility of gold nanoparticles enables them to have a wide range of applications in biomedicine-and biosensingrelated felds [1][2][3][4][5]. Gold nanoparticles are easily modifed by attaching nucleic acids, proteins, peptides, and organic compounds. ...
Gold nanoparticles have been used as drug carriers and imaging reagents. The plant extract-capped gold nanoparticles provide better properties than chemically synthesized gold nanoparticles. In this study, Zingiber zerumbet extract-mediated green production of gold nanoparticles (Z. zerumbet@Au NPs) was established. Based on the UV-visible spectroscopy and transmission electron microscope (TEM) results, most Z. zerumbet@Au NPs were spherical. When more Z. zerumbet extracts were added, more spherical nanoparticles were formed. The hydrodynamic size changed slightly along with time, and the average size was approximately 170 nm. Capping of Z. zerumbet extract on the surface of gold nanoparticles was confirmed by Fourier transform infrared spectroscopy (FTIR). In general, phenolic compounds or flavonoid compounds were considered to be the reducing agent. However, zerumbone was identified as the reducing agent in this study. The resulting oxidized products were characterized by high-performance liquid chromatography-mass spectrometry (HPLC-MS). As a result, the solvent was proven to be involved in nanoparticle synthesis. Overall, Z zerumbet@Au NPs showed great potential to be used in cosmetic- or biomedicine-related fields.
... Electrochemical characterization of bare GCE and Au NPs/Nafion/ GCE working electrodes were carried out using CV. The surface area of the bare GCE, Nafion/GCE and Au NPs/Nafion/GCE was calculated using Randles-Sevcik equation (Taherizadeh et al., 2023;Barman et al., 2013;Tseng et al., 2020): ...
... where, i pa refers to the anodic peak current, v for the scan rate (V s − 1 ), D stands for the diffusion coefficient (7.6 × 10 − 6 cm 2 s − 1 ), A is the surface area of the electrode (cm 2 ), C for the [Fe(CN)6] 3-/4concentration (mol cm 3 ) and other symbols have their usual meanings (Tseng et al., 2020). For K 3 [Fe(CN) 6 ] 3-/4concentration (mol/cm 3 ) (1.0 mM) in KCl (100 mM) supporting electrolyte, n = 1, the value of D = 7.6 × 10 − 6 cm 2 s − 1 (Taherizadeh et al., 2023). ...
... The phosphorothioate group (P = S) in parathion has also great affinity to bind well with Au NPs via formation of Au-S coordinated bond (Barman et al., 2013), and subsequently enriched parathion at the surface of the modified electrode surface (Zahran et al., 2021;Kang, et al., 2010). On the other hand, Au NPs have also incredible catalytic and electrical characteristics towards cathodic peak current signal of parathion via accelerating electron transfer kinetics (Zahran et al., 2021;Tseng et al., 2020). Thus, combination of Au NPs with Nafion as nano composites could enhance their catalytic activities towards electrochemical reduction of parathion. ...
... [236,237] Persistent organic pollutants in environment include polychlorinated biphenyls, polybrominated diphenyl ethers, and polycyclic aromatic hydrocarbons as a result of industrial and household waste. [238][239][240][241][242][243] Other well-documented pollutants are pesticides, drugs, allergens, mycotoxins, and a variety of small toxic substances such as melamine. The routine use of these organic substances in agricultural and livestock production leads to their heavy accumulation in atmosphere, soil, water, and eventually human body through the food chain, raising threats to the humans. ...
Recent years have witnessed an exponential increase in the research on gold nanoparticles (AuNPs)-based colorimetric sensors to revolutionize point-of-use sensing devices. Hence, this review is compiled focused on current progress in the design and performance parameters of AuNPs-based sensors. The review begins with the characteristics of AuNPs, followed by a brief explanation of synthesis and functionalization methods. Then, the mechanisms of AuNPs-based sensors are comprehensively explained in two broad categories based on the surface plasmon resonance (SPR) characteristics of AuNPs and their peroxidase-like catalytic properties (nanozyme). SPR-based colorimetric sensors further categorize into aggregation, anti-aggregation, etching, growth-mediated, and accumulation-based methods depending on their sensing mechanisms. On the other hand, peroxidase activity-based colorimetric sensors are divided into two methods based on the expression or inhibition of peroxidase-like activity. Next, the analytes in environmental and food samples are classified as inorganic, organic, and biological pollutants, and recent progress in detection of these analytes are reviewed in detail. Finally, conclusions are provided, and future directions are highlighted. Improving the sensitivity, reproducibility, multiplexing capabilities, and cost-effectiveness for colorimetric detection of various analytes in environment and food matrices will have significant impact on fast testing of hazardous substances, hence reducing the pollution load in environment as well as rendering food contamination to ensure food safety.
... 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 ...
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.
... Organophosphorus pesticides (OPs) are widely used in agricultural products to protect crops from pest and disease hazards [1,2]. However, the widespread use of OPs has resulted in trace residues in soil, water and crops [3]. ...
Terbium-based metal–organic frameworks (Tb-MOF) prepared under mild conditions was utilized to construct a fluorescence probe for determination of organophosphorus pesticides (OPs) coupled with acetylcholinesterase (AChE), acetylcholine chloride (Ach), and choline oxidase (CHO). Since OPs have obvious inhibition on the activity of AChE in the Tb-MOF/ACh/CHO/AChE system, the detection of OPs was accomplished by restoring the fluorescence of Tb-MOF resulting from reduced production of H2O2. By taking chlorpyrifos (CPF) as a pesticide model, the method exhibits high sensitivity in the linear range 0.1–4.0 μg·L⁻¹ with the limit of detection (LOD) of 0.04 μg·L⁻¹ under optimum conditions (λex = 280 nm, λem = 544 nm). The Tb-MOF/ACh/CHO/AChE fluorescence system has high selectivity for CPF. The method was successfully applied to the detection of CPF in tap water and strawberry samples (recovery of 87.36–115.60% for tap water and 95.04–103.20% for strawberry). Free from complicated fabrication operation, the Tb-MOF-based system is rapid, simple, and stable, which provides a reference and new way for the design of OPs fluorescent probes in the future.
Graphical abstract
... Development of nanomaterials for the detection and quantitation of important hazardous metallic and gaseous species is highly anticipated for environmental remediation [1][2][3]. To this track, many tactics, such as organic nano-probes, fluorescent quantum dots, flexible electronic devices, nanomaterials-based electrochemical/immuno assay, molecularly imprinted materials, nanoparticles mediated colorimetric assay, etc., have been proposed with demonstrated applications [4][5][6][7][8][9][10][11][12]. Among them, gold nanoparticles (AuNPs)-based colorimetric assays of metal ions, anions, pesticides, drugs, illegal food additives, etc., are noted as an unique approach in terms of their applicability [11,12]. ...
... To this track, many tactics, such as organic nano-probes, fluorescent quantum dots, flexible electronic devices, nanomaterials-based electrochemical/immuno assay, molecularly imprinted materials, nanoparticles mediated colorimetric assay, etc., have been proposed with demonstrated applications [4][5][6][7][8][9][10][11][12]. Among them, gold nanoparticles (AuNPs)-based colorimetric assays of metal ions, anions, pesticides, drugs, illegal food additives, etc., are noted as an unique approach in terms of their applicability [11,12]. Be noted that few AuNPs-based colorimetric assay can detect analytes down to femtomolar level, which directs the AuNPs mediated sensing research towards diverse analytes [13,14]. ...
A cysteamine functionalized nanodiamond (NDC) was conjugated to gold nanoparticles (AuNPs) to deliver NDC@AuNPs and utilized in enhanced colorimetric detection of Cr3+ at pH 6 environment. The conjugation was validated using FTIR, TEM, PXRD, DLS, and zeta potential investigations. At pH 6, superior sensory response of
NDC@AuNPs to Cr3+ than that of other ions was validated by UV–vis spectroscopy and colorimetric photo- graphs. Results from UV–vis titrations displayed a linear regression from 0.01 to 0.4 µM with a LOD of 0.236 ± 0.005 nM. The particle aggregation, size variations, potential changes, and binding modes are investigated using
TEM, DLS, and FTIR techniques to explore the underlying mechanisms. By adding the EDTA, sensory response is reversible up to 4 cycles. Finally, spiked real water experiments show improved sensing of Cr3+ at pH 6 via the observed recovery between 96 and 110 %, which is in good agreement with the ICP-mass data.
... 4,5,[11][12][13] For using AuNPs for sensing metal ions, its surface has to be functionalized with some molecule(s), which can interact with the incoming metal ions strongly and promote aggregation or some other alternation in the particles resulting in colour and spectral change. [12][13][14][15] To develop such functional AuNPs for detecting toxic metal ions in water, AuNPs have been prepared, and glycylglycine has been used to modify the surface of the particles. These functionalized AuNPs effectively detected Hg 2? , Pb 2? , and Cr 3? with distinct colour changes out of a large number of metal ions tested in water. ...
Glycylglycine functionalized water-dispersible gold nanoparticles (AuNPs) were prepared and characterized on the basis of ultraviolet and visible spectroscopy (UV-vis), Fourier transform infrared (FTIR), dynamic light scattering (DLS), transmission electron microscope (TEM) and energy dispersive X-ray (EDX) analysis. The AuNPs exhibited a strong SPR band at 522 nm, which after functionalization with glycylglycine, appeared at 525 nm. This SPR band of the functionalized nanoparticles is used as a tool for the detection of toxic metal ions in water. A large number of metal ions were tested, among which Hg2+, Pb2+, and Cr3+ exhibited distinct colour change, detectable with bare eye, and substantial UV-vis spectral change. TEM images and EDX analysis suggested that the colour change is due to metal-induced aggregation of the functionalized nanoparticles due to inter-particle plasmon coupling. The aggregation, which resulted in an increase in particle size, is further confirmed by DLS measurement. A mechanism of metal-induced aggregation is also proposed. The present study is an example of a simple methodology to prepare water-dispersible functionalized nanoparticle for colorimetric detection of toxic heavy metal ions such as Cr3+, Pb2+, and Hg2+ with high sensitivity.Graphical abstract
Synopsis Glycylglycine functionalized water dispersible gold nanoaprticles were prepared, characterized and its metal-ion sensing property was evaluated with the aid of spectroscopic, microscopic and energy dispersive X-ray analysis. These nanoparticles detect Hg2+, Pb2+ and Cr3+ with colour change due to inter particle plasmon coupling because of metal-induced aggregation of the nanoparticles.
... Various excellent reviews regarding the Au NMs can be found in the academic literature but most of these reviews either focuses on a variety of applications of Au NMs or covers the various types of functionalized Au NMs (Das et al., 2011;Zeng et al., 2011;Cao et al., 2014;Alex and Tiwari, 2015;Elahi et al., 2018;Tripathy et al., 2018;Tseng et al., 2020). Herein, we have limited the scope of the literature by only including the case studies that utilize the surfactant as the stabilization/fabrication medium for the generation of Au NMs and are further applied for carrying the sensing application. ...
Surfactant stabilized Gold (Au) nanomaterials (NMs) have been documented extensively in recent years for numerous sensing applications in the academic literature. Despite the crucial role these surfactants play in the sensing applications, the comprehensive reviews that highlights the fundamentals associated with these assemblies and impact of these surfactants on the properties and sensing mechanisms are still quite scare. This review is an attempt in organizing the vast literature associated with this domain by providing critical insights into the fundamentals, preparation methodologies and sensing mechanisms of these surfactant stabilized Au NMs. For the simplification, the surfactants are divided into the typical and advanced surfactants and the Au NMs are classified into Au nanoparticles (NPs) and Au nanoclusters (NCs) depending upon the complexity in structure and size of the NMs respectively. The preparative methodologies are also elaborated for enhancing the understanding of the readers regarding such assemblies. The case studies regarding surfactant stabilized Au NMs were further divided into colorimetric sensors, surface plasmonic resonance (SPR) based sensors, luminescence-based sensors, and electrochemical/electrical sensors depending upon the property utilized by the sensor for the sensing of an analyte. Future perspectives are also discussed in detail for the researchers looking for further progress in that particular research domain.
... [24][25][26] The functionalization of different nanoparticles for sensing different ions had a great effect on selectivity and sensitivity. [27][28][29] In this review different nanoparticles, their functionalization with different materials, a mechanism of sensing of Hg(II) ions in the environmental and biological samples are discussed. ...
To maintain a green and sustainable environment for human beings, rapid detection of potentially toxic heavy metals like mercury (Hg(II)) has attracted great attention. Recently, sensors have been designed which can selectively detect Hg(II) over other common available cations and give a naked eye or fluorometric response. In the last two decades, the trend is shifting from bulky organic chemosensors toward nanoparticles due to their rapid response, low cost, eco-friendly and easy synthesis. In this review, promising nanoparticles-based sensors for Hg(II) detection are discussed. The nano-sensors are functionalized with nucleotide or other suitable materials which coordinate with Hg(II) ions and give clear color or fluorescence change. The operational mechanisms are discussed focusing on its four basic types. The nanoparticles-based sensors are even able to detect Hg in three different oxidation states (Hg(II), Hg(I) and Hg(0)). Recently, the trend has been shifted from ordinary nanoparticles to magnetic nanoparticles to simultaneously detect and remove Hg(II) ions from environmental samples. Furthermore, the nano-sensors for Hg(II) are compared with each other and with the reported organic chemosensors.
... The advantage of this sensor is that the target and aptamer are incubated preferentially in solution, which can reduce the influence of other sequences and environmental factors on it, allowing the target to be fully captured by the aptamer [32]. Secondly, because AuNPs can strongly quench fluorescence through nanometal surface energy transfer (NSET), the background signal of the sensor is weakened and sensitivity of the sensor is improved [33,34]. ...
In order to develop a fluorometric aptamer-based biosensor for ultrasensitive and selective detection of phoxim, a modified magnetic beads-systematic evolution of ligands by exponential enrichment (MB-SELEX) method was used in this study to select phoxim aptamer. An aptamer (APT3) that bonded to phoxim with high affinity was obtained after 15 rounds of selection, which had dissociation constant (Kd) of 0.93 ± 0.25 μM. A fluorometric aptasensor was then developed and enhanced the sensitivity and selectivity of phoxim detection based on APT3, multi-complementary strands (CS) and gold nanoparticles (AuNPs). This method had a good linear range of 0.05–5 μM, and detection limit was as low as 29.69 nM for phoxim. In addition, the aptasensing specifically captured phoxim in a variety of pesticides and real samples. The herein results proved that the method can be applied in practical detection.
