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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

Composição química e avaliação da atividade antimalárica de Cipó-tuíra [Bonamia ferruginea (Choisy) Hallier f)]

Lopes, Edizon Veiga, 92-9643-3377 30 April 2015 (has links)
Submitted by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-02-07T15:24:31Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação_Edizon V. Lopes.pdf: 4850594 bytes, checksum: f3439ff70178fccde2f5d8fc7e63746f (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-02-07T15:24:46Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação_Edizon V. Lopes.pdf: 4850594 bytes, checksum: f3439ff70178fccde2f5d8fc7e63746f (MD5) / Made available in DSpace on 2018-02-07T15:24:46Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação_Edizon V. Lopes.pdf: 4850594 bytes, checksum: f3439ff70178fccde2f5d8fc7e63746f (MD5) Previous issue date: 2015-04-30 / FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas / Bonamia ferruginea (Choisy) Hallier f., popularly known as cipó-tuíra is a small liana that has velvety, brown-colored leaves and stems. It is used by the Amazonian people in the treatment of malaria. In vitro antiplasmodial activity against Plasmodium falciparum was evaluated for extracts that were prepared by infusion and decoction of stem and leaf, and soxhlet extraction using chloroform, methanol and water as solvents. The methanol and aqueous leaf extracts were tested against Plasmodium berghei in vivo in mice. All extracts were inactive in vitro and in vivo. This work was performed to study the chemical composition of B. ferruginea. We opted for the chromatographic fractionation of the chloroform extract, although it was not considered active (40.6%) inhibition at 50 μg mL-1) against P. falciparum in the in vitro test. From the hexane extract of the stem of B. ferruginea the triterpenes lupeol, friedelin and glutinol were isolated. The chloroform extract of the stem provided the coumarins scopoletin and isofraxidin. A hemiterpene, 2-methyl-1,2,3,4-butanetetrol, was isolated from the ethyl acetate extract of the stem of B. ferriginea. The characterization of the isolated compounds was performed by spectroscopic techniques such as MS and one and two dimensional NMR, and comparison with literature data. / Bonamia ferruginea (Choisy) Hallier f., popularmente conhecida como cipó-tuíra, é uma liana de pequeno porte com caule e folhas aveludadas de cor marrom, utilizada pela população amazônica no tratamento de malária. No presente trabalho, foi avaliada a atividade antiplasmódica in vitro contra o Plasmodium falciparum dos extratos preparados por infusão e decocção de caule e folha, e extratos feitos das mesmas partes da planta, em aparelho de soxhlet com clorofórmio, metanol e água. Os extratos metanólico e aquoso da folha foram testados contra o Plasmodium berghei in vivo em camundongos. Os extratos não apresentaram atividade antimalárica in vitro ou in vivo. Também foi realizado um estudo da composição química de B. ferruginea. Optou-se pelo fracionamento cromatográfico do extrato clorofórmico do caule, mesmo não sendo considerado ativo (40,6% de inibição a 50 μg/mL-1) frente ao P. falciparum no teste in vitro. Do extrato hexânico proveniente do caule de B. ferruginea, foram isolados os triterpenos lupeol, friedelina e glutinol. Do extrato clorofórmico do caule, obtiveram-se as cumarinas escopoletina e isofraxidina e o hemiterpeno 2-metil-1, 2, 3, 4-butanotetrol, isolado do extrato acetato de etila do caule de B. ferriginea. A caracterização das substâncias isoladas foram realizada por técnicas espectroscópicas como EMAR e RMN uni e bidimensional, além de comparação com dados da literatura.

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