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PublicaĆ§Ć£o
Structural elucidation of natural 2-hydroxy di- and tricarboxylic acids and esters, phenylpropanoid esters, and a flavonoid from Autonoƫ madeirensis using gas-chromatographic/electron ionization, electrospray ionization and tandem mass spectrometric techniques
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Orientador(es)
Resumo(s)
The chemical composition of AutonoĆ« madeirensis bulbs was characterized as part of a systematic phytochemical study of this species. The compounds reported were mainly identified on the basis of gas-chromatographic/electron ionization, electrospray ionization and tandem mass spectrometry. The structures of the pure compounds were also characterized by means of other physical and spectroscopic data (m.p., IR, UV, NMR). The compounds identified were 2-hydroxy di- and tricarboxylic acids and esters (malic acid, citric acid, and their methyl and ethyl esters), cis- and trans-hydroxycinnamic esters (methyl and ethyl p-coumarate, and methyl ferulate), and a new flavone diglucoside (7-O-[Beta-glucosyl-(1ā2)-O-Beta-glucosyl]apigenin), the interglucosidic linkage (1ā2) of which is, to the best of our knowledge, reported for the first time in a diglucoside of apigenin. The results may contribute to the chemotaxonomy of AutonoĆ« genus and lead to a rapid tool for the systematic characterization of these compounds in plant extracts.
DescriĆ§Ć£o
Palavras-chave
Autonoƫ madeirensis Scilla maderensis di- and tricarboxylic acids and esters hydroxycinnamic esters apigenin diglucoside
Contexto Educativo
CitaĆ§Ć£o
J. Mass Spectrom. 2003; 38: 1240ā1244