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Contributions of Short-Range and Classical Electromagnetic Mechanisms to Surface-Enhanced Raman Scattering from Several Types of Biomolecules Adsorbed on Cold-Deposited Island Films

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Surface-enhanced Raman scattering (SERS) spectra of three different classes of adsorbates have been analyzed: (1) native and denatured calf thymus DNA and adenine, as examples of molecules with electronic transitions in the UV region only; (2) flavine adenine dinucleotide (FAD) and doxorubicin (DOX), as examples of chromophores with low extinction transitions in the visible region; and (3) β-carotene, as an example of a chromophore with a very high extinction coefficient for an electronic transition in the visible region. These molecules were adsorbed on silver island films that had an extinction maximum in the 450-660 nm region of the electromagnetic spectrum. The short-range mechanism of Raman enhancement has been demonstrated to contribute primarily to enhanced Raman scattering from molecules in groups 1 and 2, whereas the pure (classical) electromagnetic mechanism dominates the enhancement of β-carotene resonance Raman scattering.

Keywords: DNA; Doxorubicin (DOX); Flavin adenine dinucleotide (FAD); Silver colloids; Silver island films; Surface-enhanced Raman scattering (SERS); β-carotene

Document Type: Research Article


Affiliations: 1: Shemyakin Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia 2: Department of Chemistry, Iowa State University, Ames, Iowa 50011

Publication date: April 1, 1993

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