4.6 Article

Comparison of Glyphosate Detection by Surface-Enhanced Raman Spectroscopy Using Gold and Silver Nanoparticles at Different Laser Excitations

期刊

MOLECULES
卷 27, 期 18, 页码 -

出版社

MDPI
DOI: 10.3390/molecules27185767

关键词

SERS; glyphosate; substrate; pesticides; silver; gold; colloid

资金

  1. Foundation of the Croatian Academy of Sciences and Arts
  2. Croatian Government
  3. European Union [KK.01.1.1.01.0001]
  4. Croatian-Hungarian bilateral ST project [2018-2.1.12-TET-HR-2018-00003]

向作者/读者索取更多资源

This study compares the detection of glyphosate using surface-enhanced Raman scattering (SERS) with gold and silver nanoparticles and three different laser excitations. The results show that silver nanoparticles at 532 nm excitation and gold nanoparticles at 785 nm excitation have the best detection limits. Additionally, the use of cysteamine-modified silver nanoparticles improves the detection limits for all three laser excitations.
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 mu M. 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 mu M, and by one order of magnitude for 632 and 785 nm excitation wavelengths.

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