Effects of cetylpyridinium bromide micelles on the spectrofluorimetric characteristics of polycyclic aromatic hydrocarbons.
The presence of a micellar medium of cetylpyridinium bromide (CPB) causes, in relation to the aqueous medium, important bathochromic shifts in the excitation spectra of a considerable number of polycyclic aromatic hydrocarbons (PAHs). Furthermore, the CPB acts as a quencher, provoking inhibitions of the fluorescence intensity emitted by PAHs. The micellar inhibition factors show that, generally, the quenching affects alternant hydrocarbons to a greater extent. Some interesting relationships between the hydrocarbon structure and both the characteristic wavelengths of fluorescence spectra and the values of Deltalambda are established.
Ayala
J H
JH
Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, E-38204 La Laguna, Spain.
Afonso
A M
AM
González
V
V