Search Results - "Leitão, Gilda"

Countercurrent chromatography isolation of green propolis biomarkers: Potential blockers of SARS-COV-2 RBD and ACE2 interaction by dos Santos, Cristiane Cardoso, Silva, Alicia Fontoura da, Castro, Rosane Nora, Pires, Lucas de Oliveira, Campos, Mariana Freire, de Oliveira, Beatriz A.C., Allonso, Diego, Leitão, Suzana Guimarães, Leitão, Gilda Guimarães

“…•Green propolis biomarkers were successfully isolated by one-step countercurrent chromatography.•The hexane extract of green propolis (HEGP) from Rio de…”
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Ethnopharmacological evaluation of medicinal plants used against malaria by quilombola communities from Oriximiná, Brazil by Oliveira, Danilo R., Krettli, Antoniana U., Aguiar, Anna Caroline C., Leitão, Gilda G., Vieira, Mariana N., Martins, Karine S., Leitão, Suzana G.

“…Malaria is the most important parasitic disease in the world, including in the Amazon region, due to its high incidence. In addition, malaria is difficult to…”
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Alternating isocratic and step gradient elution high-speed counter-current chromatography for the isolation of minor phenolics from Ormocarpum kirkii bark by Kamto, Eutrophe Le Doux, Carvalho, Tatiane S.C., Mbing, Joséphine Ngo, Matene, Marie C.N., Pegnyemb, Dieudonné E., Leitão, Gilda G.

“…•Two new flavones and one biflavanone glycosides were isolated from Ormocarpum kirkii by HSCCC.•Application of several solvent systems afforded 14 compounds…”
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SARS-CoV-2 spike protein increases angiotensin converting enzyme-2 expression and promotes an increase in glucose uptake in endothelial cells by Campos, Mariana F., Constant, Larissa E. C., Teixeira, Douglas E., Silva-Aguiar, Rodrigo P., Rocco, Patrícia R. M., Mohana-Borges, Ronaldo, Leitão, Gilda G., Caruso-Neves, Celso, Leitão, Suzana G., Allonso, Diego

“…Coronavirus Disease 2019 (COVID-19) pandemic led to 7 million deaths and more than 770 million confirmed cases worldwide. The Spike glycoprotein (SP) is…”
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Unexpected Rearrangement and Aromatization on Dehydration Reaction of the Bioactive Diterpenequinone 7α-Hydroxyroyleanone by Leitão, Gilda, Pinheiro, Aline, Rezende, Victor, Silva, Raphael, Paula, Leonardo, Soares, Deivid, Saraiva, Elvira

“…7a-Hydroxyroyleanone is a bioactive diterpene isolated from leaves of Tetradenia riparia, active against tuberculosis and T. cruzi. In order to use this…”
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Mass spectrometry as a tool for the dereplication of saponins from Ampelozizyphus amazonicus Ducke bark and wood by Mendonça, Simony C., Simas, Rosineide C., Reis Simas, Daniel L., Leitão, Suzana G., Leitão, Gilda G.

“…Introduction Mass spectrometry in natural products research has been used as a first step to identify possible chemical structures and to guide subsequent…”
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Isolation of chavibetol from essential oil of Pimenta pseudocaryophyllus leaf by high-speed counter-current chromatography by dos Santos, Bruna C.B., da Silva, Júlio César T., Guerrero, Palimécio G., Leitão, Gilda G., Barata, Lauro E.S.

“…Counter-current chromatography (CCC) was used to isolate chavibetol from the essential oil of leaves of Pimenta pseudocaryophyllus (Gomes) Landrum. Chavibetol…”
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Chemical and antimicrobial analyses of essential oil of Lippia origanoides H.B.K by Oliveira, Danilo R., Leitão, Gilda G., Bizzo, Humberto R., Lopes, Daı´se, Alviano, Daniela S., Alviano, Celuta S., Leitão, Suzana G.

“…Lippia origanoides H.B.K. (Verbenaceae) is a plant known in Oriximiná (Brazil) as “Salva-de-Marajó”. Its leaves are widely used as of a spice in cooking and in…”
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Screening of Brazilian plant extracts for antioxidant activity by the use of DPPH free radical method by Mensor, Luciana L., Menezes, Fábio S., Leitão, Gilda G., Reis, Alexandre S., Santos, Tereza C. dos, Coube, Cintia S., Leitão, Suzana G.

“…Brazilian plant extracts belonging to 16 species of 5 different families (71 extracts) were tested against the stable DPPH…”
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In vitro and in vivo evaluation of efficacy and safety of photoprotective formulations containing antioxidant extracts by Reis Mansur, Maria Cristina P.P., Leitão, Suzana Guimarães, Cerqueira-Coutinho, Cristal, Vermelho, Alane Beatriz, Silva, Ronald S., Presgrave, Octávio A.F., Leitão, Álvaro A.C., Leitão, Gilda G., Ricci-Júnior, Eduardo, Santos, Elisabete P.

“…Chronic exposure to solar radiation could contribute to premature skin aging and skin cancer. Skin presents its own antioxidant defense, however when defenses…”
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Correction to Antifungal Phenylpropanoid Glycosides from Lippia rubella by Rocha Martins, Gabriel, Silva da Fonseca, Thamirys, Martínez-Fructuoso, Lucero, Costa Simas, Rosineide, Silva, Fabio T, Salimena, Fatima Regina G, Sales Alviano, Daniela, Sales Alviano, Celuta, Guimarães Leitão, Gilda, Pereda-Miranda, Rogelio, Guimarães Leitão, Suzana

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Gradient x Isocratic Elution CCC on the Isolation of Verbascoside and Other Phenylethanoids: Influence of the Complexity of the Matrix by Leitão, Gilda Guimarães, Pinto, Shaft Correa, de Oliveira, Danilo Ribeiro, Timoteo, Patrícia, Guimarães, Michelle Guedes, Cordova, Wilmer H Perera, Leitão, Suzana Guimarães

“…Verbascoside is a phenylethanoid glycoside widely distributed in nature, especially among the order Lamiales, occurring in numerous plants that are…”
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Separation of New Naphthoxazole Derivatives of Lapachol by High-Speed Counter-Current Chromatography by Del Rio, Karina P., de Moura, Kelly C. G., Pinto, Maria do Carmo F. R., Leitão, Gilda G.

“…This work describes the use of high-speed counter-current chromatography as an efficient and economic method in the separation and purification of new…”
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Chemical composition of the volatile fractions from wild and in vitro plants of Anemia tomentosa var. anthriscifolia (Pteridophyta) by Pinto, Shaft C, Leitão, Gilda G, Castellar, Aline, D’Elia, Diego S, Lage, Celso L.S, Henriques, Anaíze B, Fernandes, Janaina, Motta, Gláucia S, Bizzo, Humberto R, Leitão, Suzana G

“…Anemia tomentosa var. anthriscifolia is a very aromatic fern with ornamental potential. The major constituent of the volatile fraction of this plant is the…”
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Applications of counter-current chromatography in organic synthesis purification of heterocyclic derivatives of lapachol by Silva, Raphael S.F., Leitão, Gilda G., Brum, Thiago B., Lobato, Ana Paula G., Pinto, Maria do Carmo F.R., Pinto, Antonio V.

“…This work describes the application of counter-current chromatography (CCC) as a useful, fast and economic alternative for the isolation and purification of…”
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Gradient Elution in Countercurrent Chromatography by Leitão, Gilda Guimarães, Costa, Fernanda das Neves

“…Countercurrent chromatography is a form of liquid-liquid partition chromatography in which the stationary liquid phase is retained in the apparatus without the…”
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Strategies of solvent system selection for the isolation of flavonoids by countercurrent chromatography by Neves Costa, Fernanda das, Leitão, Gilda Guimarães

“…Flavonoids form a large class of important naturally occurring bioactive compounds. Their isolation and purification from natural sources can sometimes be very…”
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Preparative mass‐spectrometry profiling of minor concentrated metabolites in Salicornia gaudichaudiana Moq by high‐speed countercurrent chromatography and off‐line electrospray mass‐spectrometry injection by Costa, Fernanda das Neves, Borges, Ricardo Moreira, Leitão, Gilda Guimarães, Jerz, Gerold

“…Salicornia species have just been introduced to the European market as a vegetable named ‘samphire’, ‘green asparagus’, or ‘sea asparagus’. Due to its…”
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Solvent Systems Used in Countercurrent Chromatography for the Purification of Diterpene Compounds by de Mello, Leonardo Luiz Oliveira, Leitão, Gilda Guimarães

“…Diterpenes are isoprene-derived compounds, bearing four units of this building block on their fundamental core. The chemical diversity reported for this class…”
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Alkaloids from Siparuna (Siparunaceae) are predicted as the inhibitors of proteolysis and plasma coagulation caused by snake venom and potentially counteract phospholipase A2 activity of Bothrops jararaca by Fernandes, Diégina Araújo, Gomes, Brendo Araujo, Mendonça, Simony Carvalho, Pinheiro, Camila de Castro, Sanchez, Eladio Oswaldo Flores, Leitão, Suzana Guimarães, Fuly, André Lopes, Leitão, Gilda Guimarães

“…Snakebite envenomation (SBE) is the world's most lethal neglected tropical disease. Bothrops jararaca is the species that causes the greatest number of SBEs in…”
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