百草枯
表面增强拉曼光谱
胶体金
拉曼光谱
分析物
纳米技术
基质(水族馆)
检出限
材料科学
化学
色谱法
拉曼散射
纳米颗粒
有机化学
海洋学
光学
物理
地质学
作者
Min-Hui Lin,Li Sun,Fanbin Kong,Mengshi Lin
出处
期刊:Food Control
[Elsevier]
日期:2021-12-01
卷期号:130: 108280-108280
被引量:47
标识
DOI:10.1016/j.foodcont.2021.108280
摘要
As consumers demand safer food products, constant monitoring of pesticide residues in food is crucial. Conventional chromatography-based analytical methods are destructive and require time-consuming sample preparations. This study aims to establish a novel, facile, and rapid testing technique using surface-enhanced Raman spectroscopy (SERS) coupled with gold nanostars as a SERS substrate. The SERS performance was evaluated by detecting a widely used pesticide, paraquat, in green tea samples. Spiky tips of gold nanostars can serve as SERS hot spots to intensify Raman signals of analyte molecules. Additionally, the rough topography of gold nanostars has increased surface area, enabling good substrate-analyte interactions. Electron microscopes and Zetasizer were employed for the characterization of gold nanostar substrate. The detection limit of this SERS method is 0.2 mg/kg for paraquat in green tea. The results indicate that SERS coupled with gold nanostars is a practical approach and has great potential to be applied for qualification and quantification of trace contaminants in foods.
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