title: Surface-enhanced Raman scattering study of riboflavin on borohydride-reduced silver colloids: Dependence of concentration, halide anions and pH values.
abstract: The influences of concentration, halide anions and pH on the surface-enhanced Raman scattering (SERS) of riboflavin adsorbed on borohydride-reduced silver colloids were studied. The optimum concentration for the SERS of riboflavin is 10(-6)mol/L while the SERS enhancement varies for different modes. The addition of 0.2mol/L halide (NaCl, NaBr, and NaI) aqueous solutions, leads to a general decrease of the SERS intensity and a change of spectral profile of riboflavin excited at 514.5nm. Riboflavin interacts with the silver surface possibly through the CO and N-H modes of the uracil ring. The SERS spectra of riboflavin were recorded in the 3.4-11.6 pH range. By analyzing several SERS marker bands, the protonated, deprotonated or the coexistence of both molecular species adsorbed on the colloidal silver particles was proved.
authors: MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
authors: Fangfang
authors: F
authors: Liu
authors: Huaimin
authors: H
authors: Gu
authors: Yue
authors: Y
authors: Lin
authors: Yajing
authors: Y
authors: Qi
authors: Xiao
authors: X
authors: Dong
authors: Junxiang
authors: J
authors: Gao
authors: Tiantian
authors: T
authors: Cai
mesh_terms: D000838:Anions / Q000737:chemistry; D001894:Borohydrides / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D012256:Riboflavin / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods
chemical_list: D000838:Anions; D001894:Borohydrides; D003102:Colloids; D012834:Silver; D012256:Riboflavin