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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 Licania rÃgida Benth (Chrysobalanaceae) / Phytochemical study of rigid Licania Benth (Chrysobalanaceae)

Josà Noberto Sousa Bezerra 24 February 2011 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / Este trabalho descreve o estudo fitoquÃmico de Licania rigida (Chrysobalanaceae), conhecida popularmente por oiticica. Neste estudo foram utilizadas as cascas e lenho das raÃzes, o lenho do caule, folhas e flores. Os extratos obtidos foram submetidos à partiÃÃo lÃquido-lÃquido, cromatografias convencionais (adsorÃÃo e exclusÃo) e modernas Cromatografia LÃquida de Alta eficiÃncia (CLAE). A investigaÃÃo quÃmica da raiz de L. rigida resultou no isolamento dos compostos: esqualeno (LR-01), lupeol (LR-02), Ãcido betulÃnico (LR-03), niruriflavona (LR-11) e a mistura binÃria dos esterÃides, β-sitosterol e estigmasterol glicosilados (LR-06). Do caule resultou no isolamento do Ãcido licÃnico (LR-09), enquanto das folhas isolou-se o α-tocoferol (LR-07), a mistura binÃria do α-tocoferol e α-tocotrienol (LR-08), a mistura binÃria dos esterÃides β-sitosterol e estigmasterol (LR-05), os flavonÃides: afzelina (LR-12), miricetina-3-raminosÃdeo (LR-15) e o miricetina-3-glicosÃdeo (LR-16). Das flores foram isolados os compostos: canferol (LR-10), tilirosÃdeo (LR-13), licanolina (LR-14) e o diterpeno 1β,16α,17-trihidroxi-ent-caurano (LR-04). Esta investigaÃÃo quÃmica resultou no isolamento de substÃncias inÃditas para a literatura, bem como para a espÃcie e o gÃnero. A determinaÃÃo estrutural dos compostos isolados foi obtida pela anÃlise dos espectros de ressonÃncia magnÃtica nuclear de hidrogÃnio-1 e carbono-13 uni e bidimensionais, espectros de massa obtidos por Impacto EletrÃnico (EM-IE) e IonizaÃÃo por electronSpray (EM-ESI) e os espectros de infravermelho (IV), bem como atravÃs da comparaÃÃo com os dados da literatura. / This work describes the phytochemical study of Licania rigida (Chrysobalanaceae), popularly known as oiticica. In this study we used the bark and wood of roots, woody stem, leaves and flowers. The extracts were subjected to liquid-liquid partition chromatography, conventional (adsorption and exclusion) and modern, high performance liquid chromatography (HPLC). The chemical investigation of the root of L. rigida resulted in the isolation of compounds: squalene (LR-01), lupeol (LR-02), betulinic acid (LR-03), niruriflavone (LR-11) and the binary mixture of steroids, β-sitosterol and stigmasterol glycoside (LR-06). From stem was isolated the acid licanic (LR-09), while from leaves were isolated the following metabolites: α-tocopherol (LR-07), the binary mixture of α-tocopherol and α-tocotrienol (LR-08), the mixture binary steroid β-sitosterol and stigmasterol (LR-05) and the flavonoids afzelin (LR- 12), myricetin-3-ramnoside (LR-15) and myricetin-3-glucoside (LR-16). From flowers were isolated the followed compounds: kaempferol (LR-10), tiliroside (LR-13), licanolin (LR-14) and the diterpene 1β,16α,17-trihydroxy-ent-kaurane (LR-04). This chemical investigation resulted in the isolation of novel substances for literature, the species and Licania genus. Structure determination of isolated compounds was obtained by analysis of nuclear magnetic resonance spectra of a hydrogen-1 and carbon-13 one and two dimensional, mass spectra obtained by electron impact (MS-IE) and electronSpray ionization (ESI-MS) and Infrared spectra (IR) and by comparison with literature data.

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