Detection and quantification of carbendazim in Oolong tea by surface-enhanced Raman spectroscopy and gold nanoparticle substrates

Chen, Xi; Lin, Mengshi; Sun, Li; Xu, Tao-Tao; Lai, Keqiang; Huang, Meizhen; Lin, Hetong

doi:10.1016/j.foodchem.2019.04.085

Cited by 81 publications

(30 citation statements)

References 16 publications

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“…All Raman spectra were collected using the BWSpec software (version 4.11-1) and saved as a txt file for subsequent analysis. Before establishing the calibration curve, the corresponding SERS spectra were processed with the Savitzky–Golay function in BWSpec software to obtain the second derivative transformation, which can enhance the spectral resolution and adjust the baseline shift [ 27 , 56 , 57 ]. The other raw spectra were not further processed unless otherwise stated.…”

Section: Methodsmentioning

confidence: 99%

“…Surface-enhanced Raman scattering (SERS) is a vibrational spectroscopy technique for rapidly identifying, characterizing, and detecting numerous biological and chemical targets [ 20 , 21 , 22 , 23 ]. It is an effective combination of Raman spectroscopy and nanotechnology, which not only retains the advantages of the molecular fingerprint specificity and narrow spectral bandwidth of Raman spectroscopy but also greatly enhances the weak Raman scattering signal with the assistance of noble metal nanoparticles [ 24 , 25 , 26 , 27 ]. Generally, there are two widely acknowledged mechanisms for the SERS enhancement, namely electromagnetic enhancement (EM) and chemical enhancement (CE) mechanisms [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

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Fast and Low-Cost Surface-Enhanced Raman Scattering (SERS) Method for On-Site Detection of Flumetsulam in Wheat

2020

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The pesticide residues in agri-foods are threatening people’s health. This study aims to establish a fast and low-cost surface-enhanced Raman scattering (SERS) method for the on-site detection of flumetsulam in wheat. The two-step modified concentrated gold nanoparticles (AuNPs) acted as the SERS substrate with the aid of NaCl and MgSO4. NaCl is served as the activator to modify AuNPs, while MgSO4 is served as the aggregating agent to form high-density hot spots. The activation and aggregation are two essential collaborative procedures to generate remarkable SERS enhancement and achieve the trace-level detection of flumetsulam. This method exhibits good enhancement effect with an enhancement factor of 106 and wide linear range (5–1000 μg/L). With simple pretreatment, the flumetsulam residue in real wheat samples can be successfully detected with the limit of detection (LOD) down to 0.01 μg/g, which is below the maximum residue limit of flumetsulam in wheat (0.05 μg/g) set in China. The recovery of flumetsulam residue in wheat ranges from 88.3% to 95.6%. These results demonstrate that the proposed SERS method is a powerful technique for the detection of flumetsulam in wheat, which implies the great application potential in the rapid detection of other pesticide residues in various agri-foods.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast and Low-Cost Surface-Enhanced Raman Scattering (SERS) Method for On-Site Detection of Flumetsulam in Wheat

2020

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“…The quality of the PLSR model can be evaluated by the RPD values. RPD values of 5–10 are satisfactory for quality control purposes, while values of 2.5–5 are sufficient for screening samples [ 66 ].…”

Section: Methodsmentioning

confidence: 99%

Rapid Quantitative Detection of Deltamethrin in Corydalis yanhusuo by SERS Coupled with Multi-Walled Carbon Nanotubes

et al. 2020

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With the increase in demand, artificially planting Chinese medicinal materials (CHMs) has also increased, and the ensuing pesticide residue problems have attracted more and more attention. An optimized quick, easy, cheap, effective, rugged and safe (QuEChERS) method with multi-walled carbon nanotubes as dispersive solid-phase extraction sorbents coupled with surface-enhanced Raman spectroscopy (SERS) was first proposed for the detection of deltamethrin in complex matrix Corydalis yanhusuo. Our results demonstrate that using the optimized QuEChERS method could effectively extract the analyte and reduce background interference from Corydalis. Facile synthesized gold nanoparticles with a large diameter of 75 nm had a strong SERS enhancement for deltamethrin determination. The best prediction model was established with partial least squares regression of the SERS spectra ranges of 545~573 cm−1 and 987~1011 cm−1 with a coefficient of determination (R2) of 0.9306, a detection limit of 0.484 mg/L and a residual predictive deviation of 3.046. In summary, this article provides a new rapid and effective method for the detection of pesticide residues in CHMs.

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“…13, based on the current enrichment sensing strategy, the LODs of uorescence detections for the pure solution of carbendazim and BPA are lower by 2~3 orders of magnitude. In this study, the enrichment strategy based on the adsorption and desorption processes of MN-PCDP adsorbent may signi cantly increase the sensitivity of plasmonic sensors, compared with the LOD for similar molecules, [28][29][30] illustrating its wide applicability.…”

Section: Sers and Uorescence Measurement Of Pollutants Based On The Ementioning

confidence: 97%

Ultra-rapid and highly efficient enrichment of organic pollutants via magnetic nanoparticles/mesoporous nanosponge compounds for ultrasensitive nanosensors

Zhang¹,

Hao²,

You³

et al. 2021

Preprint

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Developing advanced sensing and detection technologies to effectively monitor organic micropollutants in water is under urgent demand in both scientific and industrial communities. Currently, owing to the ultrahigh sensitivity on the single-molecule level with highly informative spectra characteristics, SERS technique is regarded as the most direct and effective detection technique. However, some weakly adsorbed molecules, such as most of persistent organic pollutants, cannot exhibit strong SERS signals, which is a long-standing key challenge that has not been solved. Here, we show an enrichment-typed sensing strategy based on a powerful porous composite material, call mesoporous nanosponge. The nanosponge consists of magnetic nanoparticles immobilized porous β-cyclodextrin polymers, demonstrating remarkable capability of effective and fast removal of organic micropollutants, e.g. ~90% removal efficiency within ~1 min. With the anchoring of magnetic nanoparticles, the current new polymer adsorbent can be easily recycled from water and re-dispersed in ethanol so that the target molecules in the cavity of adsorbent is concentrated, with an enrichment factor up to ~103. By means of the current enrichment strategy, the limit of detection (LOD) of the typical organic pollutants can be significantly improved, i.e. increasing 2~3 orders of magnitude, compared with the detection without molecule enrichment protocol. Consequently, the current enrichment strategy is proved to be applicable in a variety of fields for portable and fast detection, such as Raman and fluorescent.

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Detection and quantification of carbendazim in Oolong tea by surface-enhanced Raman spectroscopy and gold nanoparticle substrates

Cited by 81 publications

References 16 publications

Fast and Low-Cost Surface-Enhanced Raman Scattering (SERS) Method for On-Site Detection of Flumetsulam in Wheat

Fast and Low-Cost Surface-Enhanced Raman Scattering (SERS) Method for On-Site Detection of Flumetsulam in Wheat

Rapid Quantitative Detection of Deltamethrin in Corydalis yanhusuo by SERS Coupled with Multi-Walled Carbon Nanotubes

Ultra-rapid and highly efficient enrichment of organic pollutants via magnetic nanoparticles/mesoporous nanosponge compounds for ultrasensitive nanosensors

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