Estudio del efecto solvatocrómico en derivados fenólicos naturales

ROMERO ALE E., OLIVES A. I., MARTÍN L., DEL CASTILLO B., AGNESE M., ORTEGA M. G., NUÑEZ MONTOYA S., CABRERA J. L..

ARS Pharmaceutica

Facultad de Farmacia de la Universidad de Granada

Lugar: Granada, España; Año: 2002 vol. 43 p. 57 - 71

0004-2927

The spectrofluorimetric bahaviour of two derivatives of quercetin isolated from the leaves of Flaveria bidentis, a derivative of 6-prenylpinocembrin isolated from the roots of Dalea elegans and an antrhaquinonic derivative isolated from the leaves of Heterophyllaea pustulata, is described. The UV-visible absorption spectra of these compounds exhibit the maxima corresponding to the chromophores wich are present in each structure. All of them show native fluorescence in different solvents. The fluorescence emission maxima shift to the red spectral region when the polarity of the solvents is increased due to the different solvation of the excited state in the different solvents. Additions of small amounts of H2SO4 cause shifts in excitation and emission wavelenghts, in agreement with those described for compounds with similar chemical structures. These fluorescence spectral changes have a considerable analytical interest because they allow to detect easily the presence of phenolic compounds in the extracts of natural plant material.