Programa de Pós-Graduação em Ciências Farmacêuticas - PPGCF/ICS
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2312
O Programa de Pós-Graduação em Ciências Farmacêuticas (PPGCF) vinculado ao Instituto de Ciências da Saúde (ICS) da Universidade Federal do Pará (UFPA) apresenta um auto-impacto de inserção regional uma vez que se trata do único PPGCF na Região Norte pelo grande potencial de utilização da biodiversidade na região amazônica. Além de favorecer a fixação e atração de profissionais qualificados na área de Ciências Farmacêuticas na Região Amazônica.
Navegar
Navegando Programa de Pós-Graduação em Ciências Farmacêuticas - PPGCF/ICS por Orientadores "OLIVEIRA, Alaide Braga de"
Agora exibindo 1 - 3 de 3
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Estudo fitoquímico e atividade antiplasmódica em Plasmodium falciparum (W2) de Himatanthus articulatus (Vahl) Woodson (Apocynaceae)(Universidade Federal do Pará, 2014-10-15) VALE, Valdicley Vieira; DOLABELA, Maria Fâni; http://lattes.cnpq.br/0458080121943649; OLIVEIRA, Alaide Braga de; http://lattes.cnpq.br/3719659803766075The present master thesis describes the phytochemical study and the antiplasmodial activity against Plasmodium falciparum (W2) of Himatanthus articulatus (Vahl) Woodson. The ethanol extract (EEHS) obtained by percolation of the bark powder, gave, after concentration, a precipitate (EEHSP) and a pasty residue that was submitted to lyophilization (EEHS). Fractionation of EEHS was carried out by successively re-extraction with DCM, AcOEt and MeOH under reflux, by acid-base partitioning for separation of alkaloids and by chromatography over silica gel column. Furthermore, the bark powder was extracted with 1 N HCl for the separation of alkaloids. TLC prospection of EEHS and EEHSP was carried out while EEHS, FrDCM EEHS, FrAcOET EEHS, FrMeOH EEHS and FAHS2 DCM were also analyzed by HPLC - DAD. Column chromatography of FrAcOET EEHS afforded a substance (S1). EEHS, the major fraction obtained in its chromatographic column (F71), DCM FAHS2 and S1 were analysed by UPLC-PDA-MS/ESI. Spectroscopic analyses of S1 (IR, UV, MS/ESI, 1H and 13CNMR) allowed its identification as plumieride. Antiplasmodial activity against P. falciparum (W2) was evaluated for EEHS, EEHSP, FrDCM EEHS, FrAcOET EEHS, FrMeOH EEHS, FAHS1 DCM, DCM FAHS2, FAEEHS, FNEEHS, FNHS DCM and S1 by the parasite lactate dehydrogenase (pLDH) method. In the TLC prospection, EEHS and EEHSP showed positive results for polyphenols and tannins, saponins, triterpenes and steroids, alkaloids and flavonoids. EEHS fractions were analyzed by HPLC-DAD showing suggestive peaks of iridoids. Analyses by UPLC-PDA-MS/ESI showed that EEHS contains plumieride as the major substance whose psedomolecular peak was observed at m/z 471 (M + H). S1 was identified as plumeride. Until now it was not reported the presence of alkaloids for the species but spots suggestive of alkaloids were observed on TLC with Dragendorff reagent of FAHS1 DCM, DCM FAHS2, FAEEHS, FNEEHS and FNHS DCM were observed. UV spectra registered online by HPLC-DAD for FAHS2 showed that the major peak is suggestive of a β-carboline alkaloid. UPLC-PDA-MS/ESI analysis of FAHS2 DCM showed an intense peak corresondng to a pseudomolecular ion 329 u that could be possibly attributed to the alkaloid 10-hydroxy-antirine-N-oxide (MM 328 u). The antiplasmodial assays were negative for EEHS, EEHSP, FrDCM EEHS, FrAcOET EEHS, FrMeOH EEHS, S1, FAEEHS, FAHS1 DCM, FNEEHS, FNHS DCM and moderately active (CI50 22,89 μg/mL) for FAHS2 DCM. These results indicate that the antiplasmodial activity might be attributed to the plant alkaloids whose presence in H. articulatus is reported here by the firist time.Item Acesso aberto (Open Access) Fitoquímica e atividade antiplasmódica de Siparuna poeppigii (Tul.) A. DC. (Siparunaceae)(Universidade Federal do Pará, 2016-11-10) PINA, Nayla Di Paula Vieira; DOLABELA, Maria Fâni; http://lattes.cnpq.br/0458080121943649; OLIVEIRA, Alaide Braga de; http://lattes.cnpq.br/3719659803766075Item Acesso aberto (Open Access) Nanocápsulas de PLGA e gordura de murumuru contendo β-lapachona: preparação, caracterização e atividade citotóxica(Universidade Federal do Pará, 2016-09-30) PONTES, Anna Carolina Avelar de Araujo; SILVA, Jaqueline Rodrigues da; http://lattes.cnpq.br/8336745480297714; OLIVEIRA, Alaide Braga de; http://lattes.cnpq.br/3719659803766075The β-lapachone (β-lap) is a natural naphthoquinone, found as a minor constituent in some species of ipe (gender Handroanthus Mattos) with pharmacological properties such as antimicrobial, anticancer and trypanocidal activities. However, their therapeutic application is challenging due to its low aqueous solubility, and high toxicity. In order to improve the bioavailability of this compound and increase its safety, different carrier systems with nanometric sizes have been developed. The nanocapsules (NC's) PLGA with oil core of murumuru fat (NCMM) were the choice for this study to encapsulate and load the β-lap. The extraction and synthesis of β-Lap of ipe sawdust lapachol promoted a yield of 92.3%. Using the nanoprecipitation method, the produced nanocapsules containing β-lap (NCMMβ-lap) showed spherical shape, surface roughness, average size between 2.0 and 132.5 ± 1.3 ± 149, polydispersity <0.2, zeta potential of -0.009 ± 0.2 and 0.15 ± 0.2 and an encapsulation efficiency of 94.3%. The NCMMβ-lap cytotoxicity showed dose- and time-dependent for the cell lines NIH/3T3 and MCF7, being more toxic than free β-lap in the same concentrations, and selective for tumor cell line MCF7. The mechanisms of cell death of free β-lap and NCMMβ-lap were very similar, observing ROS, DNA fragmentation, interlock of cells in check phases, and indication of late apoptosis and necrosis. In short, the encapsulation of β-lap potentiated the anticancer activity and suggested greater certainty in the application of this drug, pointing NCMMβ-lap as a promising alternative to enable the use of β-lap at the clinic.