Direct Detection of Toxic Contaminants in Minimally Processed Food Products Using Dendritic Surface-Enhanced Raman Scattering Substrates

Dies, Hannah; Siampani, Maria; Escobedo, Carlos; Docoslis, Aristides

doi:10.3390/s18082726

Cited by 42 publications

(27 citation statements)

References 44 publications

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“…As shown in Figure 3b, our method was able to detect fipronil by both the Raman spectra and SERS approaches. The SERS method demonstrated higher selective and sensitive ability than the Raman spectroscopy method in much of the previously reported works [11,12,13,14,15,16,17,18,19,20,21,22].…”

Section: Resultsmentioning

confidence: 94%

“…Surface-enhanced Raman scattering (SERS) procedures for the detection of fipronil are unavailable in the literature, despite SERS being conventionally applied to biosensors [17,18,19], and a possible way of detecting trace amounts of toxic contaminants in minimally processed food products [20]. Due to significant enhancements and resulting sensitivity, SERS has advantages over conventional methods (e.g., facile sample preparations and on-site detection).…”

Section: Introductionmentioning

confidence: 99%

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Surface-Enhanced Raman Scattering Detection of Fipronil Pesticide Adsorbed on Silver Nanoparticles

Nguyen

Nghi

et al. 2019

Sensors

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This work presents a surface-enhanced Raman scattering (SERS) and density functional theory (DFT) study of a fipronil adsorbed on colloidal silver nanoparticles (AgNPs). A standard curve was established to quantify fipronil within a range of 0.0001–0.1 ppm (r2 ≥ 0.985), relying on the unique fipronil Raman shift at ~2236 cm−1 adsorbed on AgNPs. DFT calculations suggest that the nitrile moiety (C≡N) binding should be slightly more favorable, by 1.92 kcal/mol, than those of the nitrogen atom of the pyrazole in fipronil and Ag6 atom clusters. The characteristic peaks of the SERS spectrum were identified, and both the calculated vibrational wavenumbers and the Raman intensity pattern were considered. The vibrational spectra of fipronil were obtained from the potential energy distribution (PED) analysis and selective Raman band enhancement.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering Detection of Fipronil Pesticide Adsorbed on Silver Nanoparticles

Nguyen

Nghi

et al. 2019

Sensors

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“…Surface-enhanced Raman scattering (SERS) has been developed as a vibrational spectroscopy technique for various applications because of its non-destructive, rapid, molecular fingerprinting, ultrasensitive, and photostable properties [16,17,18,19,20]. Compared with HPLC-MS, SERS does not require harsh solvents and a high power source, and it is easily compatible with other detection systems [21]. As a result, many studies have focused on the use of different nanoparticles (NPs) as substrates for SERS detection of pesticides, such as silver nanostructures [21,22,23,24,25,26], gold nanostructures [27,28,29,30,31], and graphene oxide [32,33].…”

Section: Introductionmentioning

confidence: 99%

4-Mercaptobenzoic Acid Labeled Gold-Silver-Alloy-Embedded Silica Nanoparticles as an Internal Standard Containing Nanostructures for Sensitive Quantitative Thiram Detection

Pham

Hahm

Huynh

et al. 2019

IJMS

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In this study, SiO2@Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO2 was confirmed by the broad bands of ultraviolet-visible spectra in the range of 320–800 nm. The effect of the 4-MBA (4-mercaptobenzoic acid) concentration on the Ag shell deposition and its intrinsic SERS (surface-enhanced Raman scattering) signal was also studied. Ag shells were well coated on SiO2@Au@4-MBA in the range of 1–1000 µM. The SERS intensity of thiram-incubated SiO2@Au@4-MBA@Ag achieved the highest value by incubation with 500 µL thiram for 30 min, and SERS was measured at 200 µg/mL SiO2@Au@4-MBA@Ag. Finally, the SERS intensity of thiram at 560 cm−1 increased proportionally with the increase in thiram concentration in the range of 240–2400 ppb, with a limit of detection (LOD) of 72 ppb.

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“…To quantitatively estimate the Ag nanostructure-induced enhancement, we could calculate the relative enhancement factor (REF) according to different exposure time. The REF of SERS optical fibre substrate strongly depends on the SERS conditions, such as morphology of substrate, analytic, excitation wavelength, etc., and can be calculated by the formula 17,41 :where I SERS is the SERS intensity of R6G adsorbed on an Ag nanostructure optical fibre substrate and I R represents the normal Raman intensity (non-SERS) of R6G on the optical fibre probe without Ag nanostructure. C SERS is the concentration of R6G (10 −5 M) in SERS spectrum, C R is the concentration of R6G (1 M) in normal Raman spectrum as depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Detection of Permethrin pesticide using silver nano-dendrites SERS on optical fibre fabricated by laser-assisted photochemical method

Pham

Hoang

Hai

et al. 2019

Sci Rep

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Permethrin, 3-Phenoxybenzyl (1 RS)-cis,trans-3-(2,2-dichlorovinyl)- 2,2-dimethylcyclopropanecarboxylate, has a wide range of applications like insecticide, insect repellent and prevents mosquito-borne diseases, such as dengue fever and malaria in tropical areas. In this work, we develop a prominent monitoring method for the detection of permethrin pesticide using surface-enhanced Raman scattering (SERS) optical fibre substrates. The novel SERS-active optical fibre substrates were grown and deposited silver (Ag) nano-dendrites on the end of multi-mode fibre core by laser-assisted photochemical method. The characteristic of the Ag-nanostructures could be controlled by the experimental conditions, namely, laser illumination time. Ag nanoparticles optical fibre substrates and Ag nano-dendrites optical fibre substrates were prepared with laser illumination time of 3 min and 8 min, respectively. The achieved SERS-activity optical fibre substrates were tested with Rhodamine 6G aqueous solutions. We demonstrate that the SERS activity coupled with Ag nano-dendrites optical fibre substrate has higher Raman enhancement factor due to the creation of many of hot-spots for amplifying Raman signals. Besides, the stability and reproducibility of the Ag nano-dendrites optical fibre substrate were also evaluated with stored time of 1000 hours and relative standard deviation of less than 3%. The Ag nano-dendrite optical fibre substrate was selected for detection of permethrin pesticide in the concentration range of 0.1 ppm–20 ppm with limit of quantification (LOQ) of 0.1 ppm and calculated limit of detection (LOD) of 0.0035 ppm, proving its great potential for direct, rapid detection and monitoring of permethrin.

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Direct Detection of Toxic Contaminants in Minimally Processed Food Products Using Dendritic Surface-Enhanced Raman Scattering Substrates

Cited by 42 publications

References 44 publications

Surface-Enhanced Raman Scattering Detection of Fipronil Pesticide Adsorbed on Silver Nanoparticles

Surface-Enhanced Raman Scattering Detection of Fipronil Pesticide Adsorbed on Silver Nanoparticles

4-Mercaptobenzoic Acid Labeled Gold-Silver-Alloy-Embedded Silica Nanoparticles as an Internal Standard Containing Nanostructures for Sensitive Quantitative Thiram Detection

Detection of Permethrin pesticide using silver nano-dendrites SERS on optical fibre fabricated by laser-assisted photochemical method

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