High performance liquid chromatography/electrospray ionization mass spectrometry method for the on-line investigation of metabolites in species of Lychnophora genus (Asteraceae) - Moraes, Solange Leite de; Gregório, Luiz Elídio; Tomaz, José Carlos; Lopes, Norberto Peporine (International Congress of Pharmaceutical Sciences (CIFARP), 2007)