Surface-enhanced raman scattering spectroscopy of resveratrol

Vongsvivut, Jitraporn, Robertson, Evan G. and McNaughton, Don 2008, Surface-enhanced raman scattering spectroscopy of resveratrol, Australian journal of chemistry, vol. 61, no. 12, pp. 921-929.

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Title Surface-enhanced raman scattering spectroscopy of resveratrol
Author(s) Vongsvivut, Jitraporn
Robertson, Evan G.
McNaughton, Don
Journal name Australian journal of chemistry
Volume number 61
Issue number 12
Start page 921
End page 929
Publisher CSIRO
Place of publication Melbourne, Vic.
Publication date 2008
ISSN 0004-9425
1445-0038
Summary We report here, for the first time, the surface-enhanced Raman scattering (SERS) spectra of resveratrol using KNO3-aggregated citrate-reduced silver (Ag) colloids. The technique provided a substantial spectral enhancement and therefore good quality spectra of resveratrol at parts per million (ppm) concentrations. The detection limit was found to be <1 μM, equivalent to <0.2 ppm. The SERS profile additionally closely resembled its normal solid-state Raman spectrum with some changes in relative intensity. These intensity changes, together with a precise band assignment aided by density functional theory calculations at the B3LYP/6–31G(d) level, allowed the determination of the structural orientation of the adsorbed resveratrol on the surface of the metal nanoparticles. In particular, the SERS spectra obtained at different resveratrol concentrations exhibited concentration-dependent features, suggesting an influence of surface coverage on the orientation of the adsorbed molecules. At a high concentration, an adoption of close-to-upright orientation of resveratrol adsorbed on the metal surface through the p-OH phenyl ring is favoured. The binding structure is, however, altered at lower surface coverage when the concentration decreases to a tilted orientation with the trans-olefin C=C bond aligning closer to parallel to the surface of the Ag nanoparticles.
Language eng
Field of Research 030101 Analytical Spectrometry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30038960

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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