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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo fitoquÃmico de Stachytarpheta sessilis Moldenk / FitoquÃmico study of Stachytarpheta sessilis Moldenk

Ricardo Josà Pereira JÃnior 28 November 2008 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Este trabalho relata o estudo da composiÃÃo quÃmica nÃo-volÃtil de Stachytarpheta sessilis (Verbenaceae), coletada no municÃpio de Quixadà â CE, a partir da investigaÃÃo de extratos de raÃzes, talos e folhas desta espÃcie. Os extratos etanÃlicos dos talos (SSTE) e folhas (SSFE) de S. sessilis foram submetidos, separadamente, à partiÃÃo lÃquido-lÃquido com hexano, diclorometano e acetato de etila. A fraÃÃo diclorometano dos talos (SSTE-D) foi submetida a sucessivas cromatografias, resultando no isolamento da flavona crisoeriol e triterpeno pentacÃclico do tipo ursano Ãcido ursÃlico. Sucessivas cromatografias da fraÃÃo acetato de etila (SSTE-A) levaram ao isolamento do esterÃide stigmasterol na sua forma glicosilada e da flavona luteolina. O tratamento cromatogrÃfico da fraÃÃo diclorometano das folhas (SSFE-D) levou a obtenÃÃo da mistura de flavonas crisoeriol e apigenina. Sucessivas cromatografias a partir do extrato hexÃnico das talos (SSTH) permitiram a obtenÃÃo da mistura dos triterpenos pentacÃclicos do tipo ursano α e β-Amirina. A caracterizaÃÃo estrutural das substÃncias isoladas foi possÃvel atravÃs de anÃlise espectroscÃpica, utilizando-se as tÃcnicas de RMN uni e bidimensionais, Espectrometria de Massa e Infravermelho / This work outlines the study of non-volatile chemical composition of Stachytarpheta sessilis, collected in Chorozinho â CE, Brazil, through the investigation of roots, aerial parts and leaves extracts. Ethanol extracts of aerial parts and leaves of S. sessilis were submitted to liquid-liquid partition with hexane, dichloromethane (CH2Cl2) and ethyl acetate (EtOAc). The CH2Cl2 fraction of aerial parts was submitted to successive chromatography and the chrysoeriol flavone and the pentacyclic ursane triterpene ursolic acid were obtained. Successive chromatography of the EtOAc fraction yielded the isolation of glycosyl stigmasterol and luteolin flavone. Chromatographic treatment of the CH2Cl2 fraction from leaves yielded the isolation of a mixture of chrysoeriol and apigenin flavones. Successive chromatography from the hexane extract of aerial parts yielded the isolation of pentacyclic triterpene α and β amyrine as a mixture. The structural characterization of the isolated compounds was possible by spectroscopic analysis, using NMR uni and bidimensional, mass spectrometry and infrared techniques

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