25 documents found, page 1 of 3
Antileishmanial Acetylene Fatty Acid and Acetogenins from Seeds of Porcelia mac...
Brito,Ivanildo A.; Oliveira,Emerson A.; Chaves,Mariana H.; Thevenard,Fernanda; Rodrigues-Oliveira,André F.; Barbosa-Reis,Gustavo; Sartorelli,PatriciaIn the present work five acetylene derivatives (1-5), including three unknowns (1, 3 and 4), were isolated from seeds of Porcelia macrocarpa (Annonaceae). The structures of isolated compounds were determined as docos-13-yn-21-enoic acid (1), 3-hydroxy-4-methylene-2-(eicos-11’-yn-19’-enyl)but-2-enolide (2), 3-hydroxy-4-methylene-2-(octadec-9’-yn-17’-enyl)but-2-enolide (3), 3-hydroxy-4-methylene-2-(hexadec-7’-yn-...
Chemical Constituents and Cytotoxic Activity of Rhinella jimi (Anura: Bufonidae)
Monção Filho,Evaldo S.; Pio,Yara P. F.; Chaves,Mariana H.; Ferreira,Paulo M. P.; Fonseca,Mariluce G.; Pessoa,Cláudia; Lima,Daisy J. B.; Araújo,Bruno Q.Rhinella jimi toads (Stevaux, 2002) belong to the Bufonidae family, are endemic in the Brazilian Northeast and are commonly found during rainy periods. In general, amphibians of this family have in their poisons different metabolites that show a diversity of pharmacological activities. The isolation and identification of these compounds are of great importance, and techniques such as high-performance liquid chr...
ISOFLAVONOIDES DA TRIBO DALBERGIEAE: UMA CONTRIBUIÇÃO QUIMIOSSISTEMÁTICA PARA A...
Carvalho,Adonias A.; Santos,Lucivania R. dos; Freitas,Jurema S. de; Chaves,Mariana H.Plants from Fabaceae family have several secondary metabolites and high biological potential. The subfamily Papilionoideae (Fabaceae) has 28 tribes, of which Dalbergieae comprises 49 genera and 1325 species. Isoflavonoids are chemotaxonomic markers of Papilionoideae and have important biological properties. This review describes the isoflavonoids and biological activities from the tribe Dalbergieae (Fabaceae-Pa...
COMPOSIÇÃO QUÍMICA E ATIVIDADE ANTILEISHMANIA DE Tocoyena hispidula
Sousa,Elcilene A. de; Rosa,Amauri Porto A.; Santos,Rodolfo Ritchelle L. dos; Santos,Ingredy L. dos; Sousa,Valéria C. de; Carvalho,Fernando Aécio de A.Phytochemical investigation of the CHCl3 fraction from EtOH extract of Tocoyena hispidula (Rubiaceae) stem resulted in the isolation and identification of D-(+)-mannitol, lupenone, 3-O-acetyloleanolic acid, lapachol, dimethyl chelidonate, morindolide and four mixtures (M1-M4): M1 (palmitate, margarate, linoleate, oleate e stearate of the multiflorenyl, lupeyl, sitosteryl and stigmasteryl), M2 (lupeol, taraxerol...
Dammarane Triterpenoids from Carnauba, Copernicia prunifera (Miller) H. E. Moor...
Almeida,Buana C. de; Araújo,Bruno Q.; Barros,Elcio D. S.; Freitas,Sâmya D. L.; Maciel,Dayany S. A.; Ferreira,Ari J. S.; Guadagnin,Rafael C.Phytochemical investigation from carnauba (Copernicia prunifera) wax led to the identification of sixteen dammarane-type triterpenes, including thirteen new characterized as: (24R*)-methyldammara-20,25-dien-3α-ol and a mixture of alkyl (24R*)-methyldammar-25-en-20-ol-3β-carboxylates, together with three previously described triterpenes: carnaubadiol, (24R*)-methyldammara-20,25-dien-3β-ol and (24R*)-24-methyldam...
Hybrid Self-Assembled Materials Constituted by Ferromagnetic Nanoparticles and ...
Santos,Anderson F. M.; Macedo,Lucyano J. A.; Chaves,Mariana H.; Espinoza-Castañeda,Marisol; Merkoçi,Arben; Lima,Francisco das Chagas A.Hybrid magnetite materials are interesting for both biomedical and catalytic applications due to their well-known biocompatibility, as well as their magnetic and electric properties. In this work we prepared Fe3O4 nanoparticles (NPs) coated with tannic acid (TA), a natural polyphenol, through two different synthetic routes, aiming to understand the influence of TA in the synthesis step and contribute to the dev...
A new flavonoid derivative from leaves of Oxandra Sessiliflora R. E. Fries
Sousa,Elcilene A. de; Silva,Armenio A. C. A. da; Cavalheiro,Alberto J.; Lago,João Henrique G.; Chaves,Mariana H.The ethyl acetate (EtOAc) phase obtained from the partition of the ethanol (EtOH) extract from leaves of O. sessiliflora R. E. Fries (Annonaceae) was subjected to several chromatographic steps, including high efficiency liquid chromatography (HPLC), to afford the flavonoids: quercetin-3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside (1), unprecedented in the literature, kaempferol-3-O-α-L-rhamnopyranosyl-(1→4)...
Chemical constituents of Lecythis pisonis and cytotoxic activity
Oliveira,Jocélia P. C.; Ferreira,Éverton L. F.; Chaves,Mariana H.; Militão,Gardenia C. G.; V. Júnior,Gerardo M.; Costa,Arenice de M.The phytochemical investigation of the ethanol extract from leaves of Lecythis pisonis Cambess., Lecythidaceae, resulted in the isolation of seven triterpenes: α- and β-amyrin, uvaol and erythrodiol, ursolic and oleanolic acids and 3β-friedelinol, as well as a mixture of sitosterol and stigmasterol steroids and a diterpene (E)-phytol. The structures of these compounds were identified by¹H and 13C NMR spectral a...
Fenóis totais, atividade antioxidante e constituintes químicos de extratos de A...
Chaves,Mariana H.; Antônia Maria das Graças Lopes,Citó; Lopes,José Arimatéia Dantas; Costa,Danielly Albuquerque da; Oliveira,Carlos Antônio A. deO presente artigo relata o isolamento e identificação do palmitato, oleato e linoleato de sitosterila, sitosterol, estigmasterol, 3-O-β-D-galactopiranosídeo do sitosterol, 3-O-β-Dgalactopiranosídeo do estigmasterol, 3-O-β-D-glicopiranosídeo do sitosterol e uma mistura de ácidos anacárdicos (monoeno e dieno) do extrato etanólico de cascas do caule de Anacardium occidentale L., Anacardiaceae, bem como do sitoster...
Biodiesel metílico de Dipteryx lacunifera: preparação, caracterização e efeito ...
Araújo,Francisca Diana da Silva; Moura,Carla Verônica Rodarte de; Chaves,Mariana H.The objective of this work was to study the potentialities of Dipteryx lacunifera Ducke seeds oil for biodiesel production. The yield in oil was of 46.11 ± 0.37%. Methyl biodiesel was prepared by base catalyzed transesterification yielding 88.13% and percentage conversion of triglycerides to corresponding methyl ester of 89.1%. The addition of the tertiary butylhydroquinone (TBHQ, 50 ppm), butylated hydroxytolu...