Flavonoids, coumarins and benzofuranes as chemotaxonomic markers in the Asteraceae / Flavonóides, cumarinas e benzofuranos como marcadores quimiotaxonômicos em Asteraceae

AUTOR(ES)

Antonio Jedson Caldeira Brant

DATA DE PUBLICAÇÃO

2003

RESUMO

This work describes the natural occurrences of flavonoids, coumarins and benzofurans in the family of plants, Asteraceae / Compositae. It has as main purpose to classify the referred secondary metabolites as possible chemotaxonomic markers of the family as well as to do predictions of occurrences of the latter. For its accomplishment, a database of occurrences of those natural products was set up from the specialized literature. The numbers of occurrences of the three chemical classes (flavonoids, 4369; coumarins, 961; benzofurans, 628) were appraised with use of statistical computacional programs. With aid of these were made correlation matrices of the occurrences, multiple linear regressions, numerous diverse diagrams. The average oxidation numbers (OXNs) of each chemical class (except the ones of the benzofurans, due to some doubts raised on their biogenetical route) were also correlated with the purpose of studies on evolutionary steps of the taxa. The results of the study point some carbon skeletons of coumarins and benzofurans that can probably serve as chemical markers at tribe and subtribe levels of the family. In relation to the flavonoids, these are already considered, at infrafamilial level, as chemical markers, especially some types of carbon skeletons bearing more specific substitution patterns. Were also mounted some empirical equations capable of predicting occurrences and average OXNs of the chemical classes involved in this work for the tribes and subtribes of the family, with a 95% reliability degree. For this work was also ulilized as taxonomic base the most recent classification of the Asteraceae of Bremer (1994a).

ASSUNTO(S)

multivariate analysis número de oxidação metabólitos secundários coumarins secondary metabolites análise multivariada asteraceae/compositae asteraceae/compositae oxidation number quimiotaxonomia flavonoids cumarinas chemotaxonomy benzofuranes flavonóides benzofuranos

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