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

Abstract

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.

A portable smartphone-based detection of glyphosate based on inhibiting peroxidase-like activity of heptanoic acid/Prussian blue decorated Fe3O4 nanoparticles

“…Au NPs were synthesized according to the reported literature. 27 The SERS spectra showed a much stronger Raman signal intensity of Fe 3 O 4 @C 7 /PB + glyphosate + Au NPs (437, 1344 cm À1 ) than Au NPs and Fe 3 O 4 @C 7 /PB-Au NPs, and two new signals were observed at 797 and 905 cm À1 (Fig. 4C).…”

A multifunctional nanozyme-based enhanced system for tert-butyl hydroquinone assay by surface-enhanced Raman scattering

“…S14). As can been seen, different kinds of AuNPs prepared by different methods, including commercial AuNPs, AuNPs prepared by sodium citrate [39], and AuNPs prepared by sodium borohydride [40], had almost no enhancement effect on Raman signal (Fig. S14).…”

Iodine-Modified Ag NPs for Highly Sensitive SERS Detection of Deltamethrin Residues on Surfaces

“…Surface-enhanced Raman scattering (SERS) has been widely known for pesticide analysis with high specificity (capable of providing fingerprint-alike information) [ 18 , 19 ], high sensitivity (possible of single molecules analysis) [ 20 ], fast detection [ 21 ] and portability [ 22 , 23 ]. One of the keys to achieving high sensitivity in SERS analysis is to effectively bring the analyte close enough to the SERS substrate.…”

“…The relative standard deviation of SERS signal on an FSM was found to be less than 10%. Most importantly, the preparation of FSM substrate is simple and straightforward, and can be easily deployed onsite [ 23 ].…”