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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 QUÍMICO E HISTOQUÍMICO DAS FOLHAS DE Duroia longiflora Ducke (Rubiaceae)

Cruz, Fabiele Souza da 01 May 2017 (has links)
Submitted by Inácio de Oliveira Lima Neto (inacio.neto@inpa.gov.br) on 2018-07-13T20:05:40Z No. of bitstreams: 2 Dissertação- Fabiele Souza da Cruz.pdf: 3582249 bytes, checksum: 07ff7e3ecd924332c2e3bd350ea02f8e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-07-13T20:05:40Z (GMT). No. of bitstreams: 2 Dissertação- Fabiele Souza da Cruz.pdf: 3582249 bytes, checksum: 07ff7e3ecd924332c2e3bd350ea02f8e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-05-01 / Fundação de Amparo à Pesquisa do Estado do Amazonas - FAPEAM / Duroia longiflora Ducke species belongs to Rubiaceae family, it occurs spontaneously in Brazil and it is also found in the Amazon region. Studies of the genus Duroia have demonstrated important chemical and biological potentials of their species; however, there are no previous chemical and biological studies with D. longiflora. Therefore, the objective of this work was to carry out phytochemical and biological studies with the extracts of leaves of D. longiflora, as well as to perform histochemical and anatomical studies with its leaves. The extracts were evaluated for their antioxidant, cytotoxic and antimicrobial activities, analyzed by comparative thin layer chromatography, nuclear magnetic resonance and then fractionated. For the histochemical study of the leaves, the presence of alkaloids, phenolic compounds, tannins, proteins, lipids and starch in the stained tissues were histolocalized, and in the anatomical study the leaf tissue descriptions were performed. For the biological assays, it was observed that the methanolic extracts of leaves and branches showed high toxicity against Artemia salina and high antioxidant effect. The results for the antibacterial assay were not conclusive. The extracts and the phases that presented positive activity in the biological assays were fractionated until the isolation of the compouds. It was possible to identify one biflavonoid 2,3-epoxy-5,7,3’,4’- tetrahydroxyflavan-(4-8)-epicatechin and -sitosterol from the chromatographic fractionation of the dichloromethane phase from the methanolic extract of the leaves. Other three alkaloids were isolated, but until the conclusion of this dissertation, it was not possible to carry out the structural identification. / A espécie Duroia longiflora Ducke, pertencente à família Rubiaceae, ocorre espontaneamente no Brasil e é encontrada na região Amazônica. Estudos do gênero mostraram importantes potenciais químicos e biológicos em suas espécies, contudo, não existe estudos prévios químicos e biológicos com D. longiflora. O objetivo deste trabalho foi realizar estudos fitoquímicos e biológicos com os extratos de folhas de D. longiflora, bem como estudos histoquímicos e anatômicos com as folhas da mesma. Os extratos foram avaliados quanto às atividades antioxidante, citotóxica e antimicrobiana, analisados por cromatografia em camada delgada comparativa e ressonância magnética nuclear e depois foram fracionados. As presenças de alcaloides, substâncias fenólicas, taninos, proteínas, lipídios e amido nos tecidos corados foram histolocalizados nas folhas e no estudo anatômico foram realizadas as descrições dos tecidos das folhas. Para os ensaios biológicos, observou-se que os extratos metanólicos das folhas e galhos apresentaram toxicidade alta frente à Artemia salina e ação antioxidante alta. O resultado do ensaio antibacteriano não foi conclusivo. Os extratos e as fases que apresentaram atividade positiva nos ensaios biológicos foram fracionados. Do fracionamento cromatográfico da fase diclorometânica do extrato metanólico das folhas foi possível identificar o biflavonoide 2,3-epoxi-5,7,3’,4’-tetrahidroxiflavan-(4-8)- epicatequina e o -sitosterol. Outros três alcaloides foram isolados, contudo, até o momento de fechamento da dissertação, não foi possível realizar a identificação estrutural.

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