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Raman and IR spectra of betulinic acid (BA) (3β-hydroxy-20(19) lupaen-28 oic acid) and of the natural birch bark have been successfully recorded and discussed. A high selectivity of the Raman technique was remarked for evidencing the betulin in the birch bark. Surface enhanced Raman spectrum (SERS) of BA on colloidal silver has been obtained. The presence and shifting of the symmetric stretching mode...
FT-Raman of solid rivanol (2-ethoxy-6,9-diaminoacridinium lactate C 15 H 16 N 3 O-C 3 H 5 O 3 . H 2 O) and surface-enhanced Raman scattering (SERS) on silver surface of rivanol solution at pH 5.5 have been obtained and compared. The assignment of vibrational modes has been made for the monocation specie of rivanol. SERS spectrum shows...
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