Constituintes de Gnaphalium spathulatum L. e analises espectrais de derivados do Glutinano

AUTOR(ES)
DATA DE PUBLICAÇÃO

1981

RESUMO

Gnaphalium spathulatum L., Compositae, is considered to be a culture invasive and occurs all over the State of São Paulo. Extracts of the aerial parts of the plant were prepared and analysed by the currently used chromatographic techniques. We were able to detect the following classes of compounds: long chain hydrocarbons, long chain esters, long chain fatty acids, isoprenoids, steroids, triterpene acids, free sugars, a polysacharide, inorganic salts and dimethyl terephthalate. Long chain hydrocarbons were not identified. Long chain esters were analysed by means of CG/MS system coupled with a computer indicating the presence of: methyl n-tetradecanoate and pamitate, ethyl laurate, myristate, n-pentadecanoate, palmitate and n-octadecanoate, and three other compounds not identified. Long chain fatty acids were identified as palmitic, stearic, oleic and/or linoleic acids through gas chromatography of their corresponding methyl esters. Squalene, phytol and dimethyl terephthalate were identified through their spectral data. Steroids were analysed by MIKES and only b-sitosterol, stigmasterol and campesterol could be identified. Reactions such as methylation, acetylation and oxidation were particulary useful for the accurate identification of oleanolic and ursolic acids. Free sugars were identified as glucose and fructose. Acidic hydrolysis of the polisacharide yielded glucose and xylose. Inorganic salts are mainly composed by potassium nitrate. The second part of this thesis deals with HNMR, C NMR and mass spectra studies of some glutinane derivatives.

ASSUNTO(S)

erva daninha ressonancia magnetica nuclear analise espectral espectrometria de massa

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