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

Abstract

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.

Research Status in the Use of Surface-Enhanced Raman Scattering (SERS) to Detect Pesticide Residues in Foods and Plant-Derived Chinese Herbal Medicines

“…In this application, gold nanoparticles with a diameter of 75 nm were prepared by a chemical reduction method and then used as a SERS detection enhancement reagent. Tis technique led to efective predictions and a low detection limit of 0.186 μg•L −1 [41]. Tis was the frst application of SERS technology to pesticide residues in CHMs, and it provides a new feasible direction for the rapid detection of pesticide residues.…”

“…Another substrate that has been used in QuEChERS is multiwalled carbon nanotubes (MWNTs), which have nanoscale hollow tubular structures and large specifc surface areas [41,55]. Tey have been applied to the detection of triazole residues in vegetables and deltamethrin residues in C. yanhusuo.…”

Surface-enhanced Raman spectroscopy as a powerful method for the analysis of Chinese herbal medicines

“…88,89 For example, He et al used carbon nanotubes for pre-adsorption treatment, and then used SERS to realize the quantitative detection of deltamethrin in Corydalis herbs. 90 As schematically shown in Fig. 6A, the amount of multi-walled carbon nanotubes (MWCNTs) was optimized to purify the interfering substances in the pretreatment process.…”

Recent Progress in Nanotechnology-Based Approaches for Food Monitoring

“…Deltamethrin, which is a benzim-idazole derivative belonging to the pyrethroid family, is widely used in fruits as an insecticide and fungicide. The detection of deltamethrin was reported to be obtained in strawberries by SERS-based AuNPs enhancement [ 169 ], in brew tea by liquid SERS-based Au-Ag colloidal NPs, in wheat by SERS-based Ag@ZnO nanoflowers [ 170 ], and in Corydalis yanhusuo by SERS-based multi-walled carbon nanotubes [ 171 ]. Fipronil, a broad-spectrum insecticide that belongs to the phenylpyrazole family, has hepatoxicity and neurotoxicity in humans [ 172 ].…”