| Year | 2014 |
|---|---|
| Journal Info. | Journal of Hazardous Materials, 265, 89-95 (2014). |
| Author | Dheeraj K. Singh, Erdene-Ochir Ganbold, Eun-Min Cho, Kwang-Hwi Cho, Doseok Kim, Jaebum Choo, Sehun Kim, Cheol Min Lee, Sung Ik Yang, Sang-Woo Joo* |
| etc. |
Abstract
We detected a trace amount of the mycotoxin citrinin using surface-enhanced Raman scattering (SERS) onsilver nanoparticle (Ag NP) surfaces. The SERS substrate on hydrophobic Teflon films was also introducedto observe the citrinin peaks. A broad band at ∼1382 cm−1, which was ascribed to the symmetric car-boxylate stretching mode, was observed in addition to an antisymmetric carboxylate stretching modeat ∼1568 cm−1in the Raman spectra. The spectral feature indicated that citrinin would adsorb on AgNPs via its carboxylate form. Based on density functional theory (DFT) calculations, vibrational modeanalysis was performed to compare the Raman spectra of citrinin. DFT calculations also predicted thata bidentate bridge configuration through O15 and O16 atoms in citrinin would be the most stable onthree Ag atoms. After treating with Ag NPs, observation of citrinin peaks was attempted in fungal cells ofPenicillium citrinum. This work may provide useful insights into the direct observation of the hazardouscitrinin mycotoxin using SERS by understanding its adsorption behaviors on Ag surfaces.
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