Detection of the mycotoxin citrinin using silver substrates and Raman spectroscopy

Journal of Hazardous Materials
Dheeraj K SinghSang-Woo Joo

Abstract

We detected a trace amount of the mycotoxin citrinin using surface-enhanced Raman scattering (SERS) on silver nanoparticle (Ag NP) surfaces. The SERS substrate on hydrophobic Teflon films was also introduced to observe the citrinin peaks. A broad band at ∼1382cm(-1), which was ascribed to the symmetric carboxylate stretching mode, was observed in addition to an antisymmetric carboxylate stretching mode at ∼1568cm(-1) in the Raman spectra. The spectral feature indicated that citrinin would adsorb on Ag NPs via its carboxylate form. Based on density functional theory (DFT) calculations, vibrational mode analysis was performed to compare the Raman spectra of citrinin. DFT calculations also predicted that a bidentate bridge configuration through O15 and O16 atoms in citrinin would be the most stable on three Ag atoms. After treating with Ag NPs, observation of citrinin peaks was attempted in fungal cells of Penicillium citrinum. This work may provide useful insights into the direct observation of the hazardous citrinin mycotoxin using SERS by understanding its adsorption behaviors on Ag surfaces.

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Citations

Sep 19, 2015·ACS Applied Materials & Interfaces·Yuan ZhaoQijun Song
Feb 24, 2015·Journal of Hazardous Materials·Michael Appell, Wayne B Bosma
Oct 28, 2016·Biotechnology Journal·Laura SutarlieXiaodi Su
Jun 3, 2017·Analytical and Bioanalytical Chemistry·Tobiloba SojinrinFurong Tian
Jan 8, 2021·Comprehensive Reviews in Food Science and Food Safety·Wenlei ZhaiMeng Wang

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