Facile and Sensitive Detection of Carbofnran Carbamate Pesticide in Rice and Soybean Using Coupling Reaction-based Surface-Enhanced Raman Scattering

Abstract

In this research, a sensitive and selective method for detecting one of the most toxic insecticides, "carbofuran", in rice and soybean is presented. This method is based on the coupling reaction of diazonium ion combined with a surface-enhanced Raman scattering technique. Diazonium ion produced from p-aminothiophenol reacts specifically with carbofuran phenol from the hydrolysis of carbofuran. The generated azo compounds attach to the surface of silver nanoparticles via the Ag-S bond. Therefore, a strong Raman intensity can be obtained. The concentration of carbofuran can be determined by following the intensity of the peak at 1201 cm -1 , attributed to the C-N stretching vibration of the azo compound. The result shows a good linear correlation (R 2 = 0.9786) against carbofuran concentrations (0.1 -5 ppm) with a detection limit of 0.452 ppm. Our proposed protocol is insignificantly influenced by various common interferences. Moreover, this method has been successfully validated to determine carbofuran concentrations in rice and soybean with detection limits of 0.446 and 0.520 ppm, respectively.

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

“…The EF of deltamethrin at 999 cm −1 is 1.8 × 10 5 . Compared with the research results of Qin et al [ 44 ] and Sukmanee et al [ 45 ], the enhancement effect increased.…”

A nickel oxide@nickel–graphene quantum dot self-healing hydrogel for colorimetric detection and removal of lambda-cyhalothrin in kumquat

“…The main methods for the detection of pesticides are high-performance liquid chromatography (HPLC), 6 gas chromatography-mass spectrometry (GC-MS), 7 surface enhanced Raman spectroscopy (SERS), 8 liquid chromatography-tandem mass spectrometry (LC-MS/MS) 9 and colorimetric method. 10 HPLC, GC-MS and LC-MS/MS are powerful tools for the detection of pesticide residues in food samples in the laboratory due to their high sensitivity, selectivity and ease of automation.…”

Detection of Pesticide Residues in Food Using Surface-Enhanced Raman Spectroscopy: A Review

“…However, besides these three types of food, vegetables, fruits, or beverages, there are fewer reports on pesticides detection in grains, oil plants, foods of animal origin, or other types. ,− In addition, there are also few studies on pesticide detection inside solid food reported. The reason is that an extraction process is needed in detection to increase the analyte concentration to achieve a better SERS signal (Figure c).…”