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Search Results: 1 - 10 of 663810 matches for " M. Fátima das G. F. da;Rodrigues Filho "
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Triterpene benzoates from the bark of Picramnia teapensis (Simaroubaceae)
Rodríguez-Gamboa Tatiana,Fernandes Jo?o B.,Rodrigues Filho Edson,Silva M. Fátima das G. F. da
Journal of the Brazilian Chemical Society , 2001,
Abstract: Two new benzoic acid esters of triterpene alcohols [lup-20(29)-en-28-oic acid 3alpha,7beta-dibenzoate and 3alpha-hydroxy-lup-20(29)-en-28-oic acid 7beta-benzoate] were isolated from the stem bark of Picramnia teapensis Tul. The structures of these compounds were established on the basis of spectral analyses. Other known compounds, beta-sitosterol, estigmasterol, lupeol and epilupeol, were identified in mixture by GC-MS. The triterpene esters have not shown in-vitro inhibitory effect on the growth of Leucoagaricus gongylophorus (Fisher), referred also as Leucocoprinus gongylophorus (Heim), syn Rozites gongylophora (M ller), the symbiotic fungus cultivated by the leaf-cutting ant Atta sexdens L.
Evaluation of herbicidal potential of depsides from Cladosporium uredinicola, an endophytic fungus found in Guava fruit
Medeiros, Lívia S. de;Sampaio, Olívia M.;Silva, Maria Fátima das G. F. da;Rodrigues Filho, Edson;Veiga, Thiago André M.;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012005000018
Abstract: two natural products produced by cladosporium uredinicola, an endophytic fungus isolated from guava fruit, were evaluated for their effects on photosynthesis. both of them inhibited electron flow (basal, phosphorylating, and uncoupled) from water to methylviologen (mv), acting as hill reaction inhibitors in freshly lysed spinach thylakoids. these polyketides, belonging to depsides class, inhibited partial reactions of photosystem ii (ps ii) electron flow from water to 2,5-dichloro-1,4-benzoquinone (dcbq), from water to sodium silicomolybdate (simo na+), and partially inhibited electron flow from 1,5-diphenylcarbazide (dpc) to 2,6-dichloroindophenol (dcpip). these results established that the depsides sites of inhibition are located on the donor and acceptor sides of ps ii, between p680 and qa. chlorophyll a fluorescence measurements corroborated this mechanism of action. none of the tested compounds inhibited photosystem i (ps i) electron transport.
The use of 13C and 1H-NMR in the structural elucidation of a new Nor-lupane triterpene
Junges, Mário J.;Fernandes, Jo?o B.;Vieira, Paulo C.;Silva, Maria Fátima das G. Fernandes da;Rodrigues Filho, Edson;
Journal of the Brazilian Chemical Society , 1999, DOI: 10.1590/S0103-50531999000400011
Abstract: the new nor-lupane triterpene, isolated from the leaves of eugenia florida dc (myrtaceae) was identified on the basis of its spectroscopic data, 13c and 1h-nmr-2d, specially cosy 1h-1h, cosy 1h-13c and hmbc correlations, as 28-o-b-d-glucopyranosyl ester of 29-hydroxyplatanic acid.
Enzymatic inhibition studies of selected flavonoids and chemosystematic significance of polymethoxylated flavonoids and quinoline alkaloids in Neoraputia (Rutaceae)
Moraes, Valéria R. de S.;Tomazela, Daniela M.;Ferracin, Ricardo J.;Garcia, Cleverson F.;Sannomiya, Míriam;Soriano, M. del Pilar C.;Silva, M. Fátima das G. F. da;Vieira, Paulo C.;Fernandes, Jo?o B.;Rodrigues Filho, Edson;Magalh?es, Eva G.;Magalh?es, Aderbal F.;Pimenta, Eli F.;Souza, Dulce H. F. de;Oliva, Glaucius;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000300007
Abstract: our taxonomic interest in the neoraputia stimulated an investigation of n. paraensis searching for alkaloids. fractions were monitored by 1h nmr and esi-ms/ms and only those which showed features of anthranilate alkaloids and flavonoids absent in the previous investigations were examined. stems afforded the alkaloids flindersine, skimmianine, 8-methoxyflindersine and dictamnine; leaves yielded 3',4',7,8-tetramethoxy-5,6-(2",2"-dimethylpyrano)-flavone, 3',4',5,7,8-pentamethoxyflavone, 5-hydroxy-3',4',6,7-tetramethoxyflavone, 3',4'-methylenedioxy-5,6,7-trimethoxyflavone and 5-hydroxy-3',4'-methylenedioxy-6,7-dimethoxyflavone. the alkaloids have remained undiscovered for 10 years. a number of flavonoids isolated from n. paraensis, n. magnifica, murraya paniculata, citrus sinensis graft (rutaceae), lonchocarpus montanus (leguminosae) were evaluated for their ability to inhibit the enzymatic activity of the protein glyceraldehyde-3-phosphate dehydrogenase from trypanosoma cruzi. highly oxygenated flavones and isoflavone were the most actives.
Extra??es de óleos de sementes de citros e suas atividades sobre a formiga cortadeira Atta sexdens e seu fungo simbionte
Fernandes, Jo?o B.;David, Valmir;Facchini, Patrícia H.;Silva, M. Fátima das G. F. da;Rodrigues Filho, Edson;Vieira, Paulo C.;Galhiane, Mário S.;Pagnocca, Fernando C.;Bueno, Odair C.;Hebling, M. José;Victor, Sandra R.;Santos, Ana Maria Rodrigues dos;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000700009
Abstract: seeds citrus oils (c. sinensis, c. limon and c. reticulata) extraction with hexane in a soxhlet apparatus and through supercritical fluid (co2) were done. besides triglycerides, the oils obtained with hexane comprised volatile compounds such as terpenes and fatty alcohols, esters, and aldehydes. however, the oils obtained by extraction with supercritical fluid presented only triglycerides. these results indicate that the extraction using supercritical fluid presents better selectivity. the activity of the oils on the development of the ant symbiotic fungus, leucoagaricus gongylophorus, showed week activity and the topic insecticide assay showed better activity for the tangerine seed oil.
Triterpene benzoates from the bark of Picramnia teapensis (Simaroubaceae)
Rodríguez-Gamboa, Tatiana;Fernandes, Jo?o B.;Rodrigues Filho, Edson;Silva, M. Fátima das G. F. da;Vieira, Paulo C.;Barrios Ch., Mariano;Castro-Castillo, Oscar;Victor, Sandra R.;Pagnocca, Fernando C.;Bueno, Odair C.;Hebling, Maria J. A.;
Journal of the Brazilian Chemical Society , 2001, DOI: 10.1590/S0103-50532001000300010
Abstract: two new benzoic acid esters of triterpene alcohols [lup-20(29)-en-28-oic acid 3a,7b-dibenzoate and 3a-hydroxy-lup-20(29)-en-28-oic acid 7b-benzoate] were isolated from the stem bark of picramnia teapensis tul. the structures of these compounds were established on the basis of spectral analyses. other known compounds, b-sitosterol, estigmasterol, lupeol and epilupeol, were identified in mixture by gc-ms. the triterpene esters have not shown in-vitro inhibitory effect on the growth of leucoagaricus gongylophorus (fisher), referred also as leucocoprinus gongylophorus (heim), syn rozites gongylophora (m?ller), the symbiotic fungus cultivated by the leaf-cutting ant atta sexdens l.
A new eremophilane-type sesquiterpene from the phytopatogen fungus Lasiodiplodia theobromae (Sphaeropsidaceae)
Nunes, Fátima M.;Oliveira, Maria da Concei??o F. de;Arriaga, ?ngela M. C.;Lemos, Telma L. G.;Andrade-Neto, Manoel;Mattos, Marcos C. de;Mafezoli, Jair;Viana, Francisco M. P.;Ferreira, Viviane M.;Rodrigues-Filho, Edson;Ferreira, Ant?nio G.;
Journal of the Brazilian Chemical Society , 2008, DOI: 10.1590/S0103-50532008000300015
Abstract: the phytopatogenic fungus lasiodiplodia theobromae, isolated from guava, was cultivated in rice for 32 days at room temperature. extraction with ch2cl2:meoh (3:7), followed by chromatography fractionation of the extract provided ergosterol. from the fungus culture in czapeck medium for 40 days at room temperature, were isolated isocoumarin cis-4-hydroxymeleine and an eremophilane-type sesquiterpene. the latter compound is being reported for the first time in the literature. also, this is the first time that an eremophilane sesquiterpene is described for lasiodiplodia genus.
Effect of Ultraviolet Radiation on Fungi Beauveria bassiana and Metarhizium anisopliae, Pure and Encapsulated, and Bio-Insecticide Action on Diatraea saccharalis  [PDF]
I. M. Wenzel Rodrigues, M. R. Forim, M. F. G. F. da Silva, J. B. Fernandes, A. Batista Filho
Advances in Entomology (AE) , 2016, DOI: 10.4236/ae.2016.43016
Abstract: The effect of ultraviolet radiation on entomopathogenic fungi can be very prejudicial for causing damage to the conidia. Formulations can help protecting these fungal structures against radiation. The objective of this study was to evaluate the effect of UV radiation on pure and encapsulated conidia Beauveria bassiana and Metarhizium anisopliae sensu lato, and to evaluate their pathogenicity on the sugarcane borer, Diatraea saccharalis. The pure conidia and the sodium alginate capsules containing the fungi were submitted to the ultraviolet radiation in different temperatures and exposure times. On the pure conidia, the radiation had a deleterious effect after 5 minutes of exposure, going from 94% to 52% germination for B. bassiana and from 96% to 54% for M. anisopliae. The alginate formulation protected the B. bassiana conidia against the radiation in all times they were evaluated (15 minutes to 48 hours), because, even after exposure, the fungi remained viable. The dry encapsulated conidia B. bassiana caused 79.6% mortality of the studied pest and the M. anisopliae caused only 10%.
Triterpenes from Cabralea canjerana as in Vitro Inhibitors to Light Reactions of Photosynthesis  [PDF]
Beatriz King-Díaz, Márcio S. Soares, Maria Fátima das G. F. da Silva, Blas Lotina-Hennsen, Thiago A. M. Veiga
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.516267
Abstract:

Aims: Cabraleadiol (1), Ocotilone (2) and Odoratone (3) are three triterpenes isolated from Cabralea canjerana (Vell.) Mart. (Meliaceae). They were chemically characterized, and their effect was tested on the light reaction of photosynthesis. Study Design: Natural products were used as models to find new models for inhibitors of photosynthesis. Place and Duration of Study: Departmento de Química, Universidade Federal de São Carlos and Departmento de Bioquímica, Facultad de Química, Universidad Nacional Autonoma de México, between May 2013 and January 2014. Methodology: The natural products had their effect on the light reaction of photosynthesis studied by pollarography and Chlorophyll a (Chl a) fluorescence transients. Results: The compounds inhibited ATP synthesis and electron transport rate (basal, phosphorylating and uncoupled). Therefore, they act as Hill reactions inhibitors. Their inhibition site were located in the range of electron flow from OEC complex and between P680 to QA of PS II, and inhibited the photosystem II (PS II) by inducing the appearance of a K-band which is an indicative that the photochemical apparatus is failing at the donor side of PS II interacting at the OEC complex and by transforming active reaction centers to “heat sinks” or the formation of silent reaction centers unable to reduce QA. Conclusion: Furthermore, these triterpenes inhibit PS II and induce the appearance of small G band which is related with the decreased plastoquinone (PQ) pool reduction.

Poly-ε-caprolactone nanoparticles loaded with hydrocortisone: preparation using factorial design and evaluation Nanopartículas de poli-ε-caprolactona carregadas com hidrocortisona: prepara o usando planejamento fatorial e sua avalia o
Nayara Alonso Cazo,Edenir Rodrigues Pereira-Filho,Maria Fátima das Gra?as Fernandes da Silva,Jo?o Batista Fernandes
Orbital : the Electronic Journal of Chemistry , 2012,
Abstract: Polymeric-nanoparticle systems such as nanocapsules and nanospheres have a great potential in applications for nanoencapsulation of corticosteroids which show low solubility in water. The physicochemical characteristics of nanoparticle suspensions are important pre-requisites for the successful development of new dosage form. In this study, hydrocortisone-loaded poly-e-caprolactone nanoparticles have been prepared by the interfacial deposition method. A 3-factor 2-level factorial design was used to study and optimize nanoparticles formulation. This factorial design was used to study the contrasts and effects of independent variables on particle size distribution, morphology, surface charge, drug content, entrapment efficiency and in vitro drug release profiles. The screened independent variables were: the concentration of hydrocortisone, poly-e-caprolactone and isodecyl oleate. A High Performance Liquid Chromatography method was developed and validated for hydrocortisone quantification. Special attention was given to both absolute recovery and entrapment efficiency. The results of optimized formulations showed a narrow size distribution with a polydispersity index near to 0.200. The particle sizes were on average 109.2 and 236.5nm to nanospheres and nanocapsules, respectively. In the best formulations the zeta potential was higher than 30 mV (in module) and the absolute recovery and entrapment efficiency were higher 82% and nearly 60%, respectively. The main variables were the quantity of the polymer and of the oil. Nanoparticles observed by the Scanning Electron Microscope depicted extremely spherical shape. In vitro release studies were performed through dialysis with continuous stream. Nanocapsules and nanospheres showed a similar pure diffusion release mechanism according to Korsmeyer-Peppas’s model. Polymeric-nanoparticle systems such as nanocapsules and nanospheres have a great potential in applications for nanoencapsulation of corticosteroids which show low solubility in water. The physicochemical characteristics of nanoparticle suspensions are important pre-requisites for the successful development of new dosage form. In this study, hydrocortisone-loaded poly-e-caprolactone nanoparticles have been prepared by the interfacial deposition method. A 3-factor 2-level factorial design was used to study and optimize nanoparticles formulation. This factorial design was used to study the contrasts and effects of independent variables on particle size distribution, morphology, surface charge, drug content, entrapment efficiency and in vitro drug release
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