银纳米粒子
检出限
拉曼光谱
拉曼散射
胶体金
分析化学(期刊)
纳米颗粒
激发
激光器
表面增强拉曼光谱
材料科学
半胱胺
光谱学
化学
纳米技术
光学
色谱法
工程类
物理
有机化学
电气工程
量子力学
作者
Lara Mikac,István Rigó,Marko Škrabić,Mile Ivanda,M. Vereš
出处
期刊:Molecules
[MDPI AG]
日期:2022-09-06
卷期号:27 (18): 5767-5767
被引量:5
标识
DOI:10.3390/molecules27185767
摘要
Glyphosate is one of the most widely used pesticides in the world, but it has been shown to persist in the environment and therefore needs to be detected in food. In this work, the detection of glyphosate by surface-enhanced Raman scattering (SERS) using gold and silver nanoparticles and three different commonly used laser excitations (532, 632, and 785 nm wavelengths) of a Raman microscope complemented with a portable Raman spectrometer with 785 nm excitation is compared. The silver and gold nanosphere SERS substrates were prepared by chemical synthesis. In addition, colorimetric detection of glyphosate using cysteamine-modified gold and silver nanoparticles was also tested. The best results were obtained with Ag NPs at 532 nm excitation with a detection limit of 1 mM and with Au nanoparticles at 785 nm excitation with a detection limit of 100 µM. The SERS spectra of glyphosate with cysteamine-modified silver NPs improved the detection limits by two orders of magnitude for 532 nm excitation, i.e., up to 10 µM, and by one order of magnitude for 632 and 785 nm excitation wavelengths.
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