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CONSTITUINTES QUÍMICOS E ATIVIDADE INSETICIDA DE Miconia ferruginata
Cunha,Gracielle Oliveira Sabbag; Matos,Andreia Pereira; Bernardo,Antonio Rogerio; Menezes,Antonio Carlos Severo; Burger,Marcela Carmen de MeloPhytochemical investigation of the leaf extracts from Miconia ferruginata (Melastomataceae) led to the isolation and characterization of the flavonoids 5,6,7-trihydroxy-4'-methoxyflavone, 5-hydroxy-7,4'-dimethoxy-8-methylflavone and 5,7,4'-trihydroxy-6,8-dimetilflavone, triterpenes ursolic acid and oleanolic acid, in addition to the steroids β-sitosterol and stigmasterol. The structures of these compounds were ...
Comparative study of torque expression among active and passive self-ligating a...
Franco,Érika Mendonça Fernandes; Valarelli,Fabrício Pinelli; Fernandes,João Batista; Cançado,Rodrigo Hermont; Freitas,Karina Maria Salvatore deAbstract Objective: The aim of this study was to compare torque expression in active and passive self-ligating and conventional brackets. Methods: A total of 300 segments of stainless steel wire 0.019 x 0.025-in and six different brands of brackets (Damon 3MX, Portia, In-Ovation R, Bioquick, Roth SLI and Roth Max) were used. Torque moments were measured at 12°, 24°, 36° and 48°, using a wire torsion device asso...
Development and validation of a RP-HPLC method to determine the xanthyletin con...
Cazal,Cristiane de Melo; Forim,Moacir Rossi; Silva,Maria Fátima G. Fernandes da; Vieira,Paulo Cezar; Fernandes,João BatistaXanthyletin is used as an inhibitor of the symbiotic fungus (Leucoagaricus gongylophorus) of the leaf-cutting ant (Atta sexdens rubropilosa), one of the most significant agricultural plague insects. The incorporation of this compound into nanoparticles is a promising approach to effectively control leaf-cutting ants. This study presents the development and validation of a specific analytical method using high-p...
Fitoquímica e quimiossistemática de Euxylophora paraensis (Rutaceae)
Isidoro,Marsele Machado; Silva,Maria Fátima das Graças Fernandes da; Fernandes,João Batista; Vieira,Paulo Cezar; Arruda,Alberto C.Phytochemical studies of the leaves and stem have led to the identification of the known coumarins isooxypeucedanin, oxypeucedanin hydrate, xanthotoxin, isopimpinellin, 8-methoxymarmesin and marmesin, flavonoids quercetin-3-O-α-L-rhamnopyranoside, myricetin-3-O-α-L-rhamnopyranoside and hesperidin, alkaloids skimmianine and N-methylflindersine and limonoid limonin. The compounds isolated and the chemical profile...
Fitoquímica e quimiossistemática de Conchocarpus marginatus e C. inopinatus (Ru...
Bellete,Barbara Sayuri; Sá,Israel Cívico Gil de; Mafezoli,Jair; Cerqueira,Cristovam do Nascimento; Silva,Maria Fátima das Graças Fernandes daPhytochemical studies of the leaves and stem have led to the identification of the known acridone alkaloids arborinine, methyl-arborinine, 1-hydroxy-3-methoxy-N-methyl acridone, xanthoxoline, 1,2,3,5-tetramethoxy-N-methylacridone, toddaliopsin C and the new seco acridone alkaloid inopinatin. The known quinoline alkaloids 2-phenyl-1-methyl-quinolin-4(1H)-one, 2-phenyl-1-methyl-7-methoxy-quinolin-4(1H)-one, dicta...
Novas N-benzoiltiraminas de Swinglea glutinosa (Rutaceae)
Cerqueira,Cristovam do Nascimento; Santos,Djalma A. P. dos; Malaquias,Karla da Silva; Lima,Murilo Marinho de CastroPhytochemical studies of the leaves and fruits have led to the identification of the known amides (E)-N-methyl-cinnamamide, N-benzoyltyramine, N-benzoyl-O-geranyltyramine, N-benzoyl-O-(4-acetoxyl)-geranyltyramine, in addition to the new N-{2-[4-(butoxyl-3-one)phenyl]ethyl}benzamide, N-{2-[4-(2,3-dihydroxy-2-methyl-butoxylanal)phenyl]ethyl}benzamide, N-{2-[4-(2,3-dihydroxy-2-methyl-butoxyloic)phenyl]ethyl}benzam...
Alkaloids and triterpene from Almeidea coerulea (Nees and Mart.) a. St.-Hil. an...
Cortez,Lucia Elaine Ranieri; Ferreira,Izabel Cristina Piloto; Lonardoni,Valdrinez Campana; Ferreira,Antonio Gilberto; Vieira,Paulo CesarThe dichloromethane extract of Almeidea coerulea stems yielded the (11-hydroxyrutaecarpine alkaloid reported for the first time from this species) and the triterpene (28-hydroxy-28, 29-dihydrolupeol). The dictamine, skimianine, sitosterol and stigmasterol were also isolated from methanol extract. Extracellular forms of Leishmania amazonensis (promastigotes) was tested with dichloromethane extract and 28-hydroxy...
Uso de CLAE no controle de qualidade em produtos comerciais de Nim: reprodutibi...
Forim,Moacir Rossi; Matos,Andréia Pereira; Silva,Maria Fátima das Graças Fernandes da; Cass,Quézia Bezerra; Vieira,Paulo Cezar; Fernandes,João BatistaThe Neem tree, Azadirachta indica, provides many useful compounds that are used as pesticides. However, the efficiency in field of products like neem oil can be committed because they have not been observed reproductive content of secondary metabolic like azadirachtin. Based on reverse-phase high-performance liquid chromatography (HPLC) a new method was developed to permit the rapid quantitative analysis of aza...
Interespecific variation in the composition of volatile oils from the leaves of...
Soares,Marisi Gomes; Silva,Maria Fátima das G. F. da; Fernandes,João Batista; Lago,João Henrique G.The volatile oils from leaves of five Brazilian specimens of Swietenia macrophylla King (Meliaceae) collected in three different Amazon Rainforest Conservation Areas in the States of Mato Grosso, Pará, and Rondônia were extracted and analyzed by GC and GC/MS. The oils showed to be composed by terpenoids, majority hydrocarbon sesquiterpenes, being germacrene D (20.5-46.8%) and bicyclogermacrene (8.3-11.1%) the m...
Atividade inseticida dos frutos de Trichilia claussenii (Meliaceae) sobre Spodo...
Nebo,Liliane; Matos,Andréia Pereira; Vieira,Paulo Cezar; Fernandes,João Batista; Silva,Maria Fátima das Graças Fernandes da; Rodrigues,Ricardo RibeiroAn evaluation of the insecticidal activity of the fruits extracts of Trichilia claussenii was carried out and the methanol extract revealed to have strong insecticidal activity. The fractionation of methanol extract of T. claussenii seeds bioassay-guided against Spodoptera frugiperda has led to the identification of the ω-phenylalkyl and alkenyl fatty acids as active compounds in this extract. The structures of...