Diferenciación de las especies Achyrocline satureioides, A. flaccida y Gnaphalium gaudichaudianum por sus perfiles cromatográficos (Differentiation of the species Achyrocline satureioides, A. flaccida and Gnaphalium gaudichaudianum by their chromatographic profiles)

The analysis of the chromatographic patterns of samples of inflorescences of Achyrocline satureioides, A. flaccida and Gnaphalium gaudichaudianum of Argentina by thin layer and gas chromatography was performed. The profiles by thin layer chromatography of A. satureioides and A. flaccida were similar, except that in A. satureioides, there is a violet zone (Rf 0.45) in predominance to the orange zone (Rf 0.4) found in samples of A. flaccida. In A. flaccida the orange zone is major than the violet zone, mentioned before. Referring to G. gaudichaudianum, two different patterns were found, which are completely different than those obtained with the samples of Achyrocline. One group shows two intense orange-magenta zones (Rf 0.5 y 0.1) that are absent or there are found in lower intensity in the second group. The profiles by gas chromatography of the volatile fraction show common peaks corresponding to alpha pinene, limonene, 1,8-cineole, alpha copaene and beta caryophyllene. There were some quantitative differences among profiles (especially with respect to alpha copaene), but overall they were not useful for the discrimination between species. TLC was useful for the correct identification of these species, very similar between themselves.