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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

ContribuiÃÃo ao conhecimento quÃmico de combretum fruticosum. / Contribution to the knowledge of chemical Combretum fruticosum

Thiciana da Silva Sousa 25 February 2010 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / Neste trabalho à descrito o isolamento dos constituintes quÃmicos micromoleculares das folhas, talos e raÃzes de Combretum fruticosum (Combretaceae), popularmente conhecida como âescova-de-macaco-alaranjadaâ. O estudo fitoquÃmico da espÃcie, empregando mÃtodos cromatogrÃficos em coluna gravitacional e cromatografia liquida de alta eficiÃncia, permitiu o isolamento de nove constituintes quÃmicos pertencentes a diferentes classes estruturais: trÃs triterpenos de esqueleto oleanano identificados como Ãcido malÃnico, Ãcido oleanÃlico e Ãcido arjunÃlico, duas lignanas denominadas (-) trachelogenina e vladinol F, uma misturas dos esterÃides β-sitosterol e estigmasterol incluindo suas respectivas formas glicosiladas, uma lactona aromÃtica Ãcido 4â-O-Acetil-3â,3,4-tri-O-metilelÃgico e o flavonÃide apigenina 8-C-β-D-glicosÃdeo. A determinaÃÃo estrutural das substÃncias foi realizada atravÃs do uso de tÃcnicas espectromÃtricas como: infravermelho (IV), espectrometria de massa (EM e EM-IES) e ressonÃncia magnÃtica nuclear de hidrogÃnio (RMN 1H) e carbono-13 (RMN 13C), incluindo tÃcnicas bidimensionais (COSY, HSQC e HMBC) e comparaÃÃo com dados descritos na literatura. / This work describe the isolation of the chemical constituents from leaves, stems and roots of Combretum fruticosum (Combretaceae), popularly known as âescova-de-macaco-alaranjadaâ. The phytochemical studies, using chromatographic methods such as gravity column chromatography over silica gel and high performance liquid chromatography (HPLC), allowed the isolation and characterization of nine chemical constituents belonging to different structural class: three oleanane triterpenes identified as malinic acid, oleanolic acid and arjunolic acid; two lignans named (-)-trachelogenin and vladinol, the mixture of β-sitosterol e stigmasterol, including its glucoside forms, a aromatic lactone 4â-O-acetyl-3â,3,4-tri-O-methylelagic and the flavonoid apigenin 8-C-β-D-glucoside. The structural determination was realized by spectrometric techniques such as: infrared (IR), mass spectrometry (EM and EM-IES), and magnetic resonance of hydrogen (1H NMR) and carbon-13 (13C NMR), including bidimensional techniques (COSY, HSQC e HMBC) and comparison with literature

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