Consulta: creatorFacets:"Branco,Alexsandro"
Registros recuperados: 6
Data/hora: 09/06/2024 03:51:58

Anthraquinones from the bark of Senna macranthera
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Branco,Alexsandro; Pinto,Angelo C.; Schripsema,Jan; Braz-Filho,Raimundo.
2-acetyl physcion (2-acetyl-1,8-dihydroxy-6-methoxy-3-methyl-9,10-anthraquinone, 2), a rare anthraquinone, was isolated from Senna macranthera var. nervosa (Vogel) H.S. Irwin &amp;amp; Barneby (Fabaceae). The chemical structure was elucidated and all ¹H and 13C NMR chemical shifts were assigned by NMR one- (¹HNMR, {¹H}-13CNMR, and APT-13CNMR) and two (COSY, NOESY, HMQC and HMBC) dimensional of this natural compound. Furthermore, the minor anthraquinones chrysophanol (3), chrysophanol-8-methyl ether (4) and physcion (5) were characterized by GC-MS analysis. The occurrence of the anthraquinones 3-5 confirms that S. macranthera is a typical representative of the genus Senna.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthraquinone; 2-acetyl-physcion; Fabaceae; Senna acranthera.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400003

Production, extraction and characterization of exopolysaccharides produced by the native Leuconostoc pseudomesenteroides R2 strain
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Paulo,Elinalva M.; Boffo,Elisangela F.; Branco,Alexsandro; Valente,Ângela M.M.P.; Melo,Itamar S.; Ferreira,Antonio G.; Roque,Milton R.A.; Assis,Sandra A. de.
The genus Leuconostoc belongs to a group of lactic acid bacteria usually isolated from fermented vegetables, which includes species involved in the production of exopolysaccharides (EPS). These biopolymers possess considerable commercial potential. Because of the wide variety of industrial applications of EPS, this study aimed to produce and characterize the native exopolysaccharide strain Leuconostoc pseudomesenteroides R2, which was isolated from cabbage collected in a semi-arid region of Bahia. We employed the following conditions for the production of EPS: 10.7% sucrose, pH 8.2, without agitation and incubation at 28ºC for 30 hours. The fermentation broth was treated with ethanol and generated two types of polysaccharide substances (EPS I and EPS II)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leuconostoc pseudomesenteroides; Exopolysaccharide; Polymer; Dextran.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200018

Chemical constituents from Vellozia graminifolia (Velloziaceae)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Branco,Alexsandro; Pinto,Angelo C.; Braz Filho,Raimundo.
From the hexane and ethyl acetate extracts obtained from stems, roots and leaf sheaths of Vellozia graminifolia, a mixture of linear hydrocarbons, a mixture of pentacyclic triterpenes, five monoisoprenylated flavonoids and one labdane diterpene, (-)-ent-3beta-hydroxy-8(17)-labden-15-oic acid, were isolated. The linear hydrocarbons and minor triterpenes were identified in their corresponding mixtures by High Resolution Gas Chromatography (HRGC) and HRGC coupled to mass spectrometry. The major pentacyclic triterpenes and the diterpene were characterized by spectral data, including 2D NMR experiments, and chemical transformations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vellozia graminifolia; Velloziaceae; Triterpenes; Diterpene; Flavonoids.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300005

Complete ¹H and 13C NMR assignments and anti fungal activity of two 8-hydroxy flavonoids in mixture
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Johann,Susana; Smânia-Jr,Artur; Pizzolatti,Moacir G.; Schripsema,Jan; Braz-Filho,Raimundo; Branco,Alexsandro.
A mixture of the two new flavonols 8-hydroxy-3, 4', 5, 6, 7-pentamethoxyflavone (1) and 8-hydroxy-3, 3', 4', 5, 6, 7-hexamethoxyflavone (2) was isolated from a commercial sample of Citrus aurantifolia. An array of one- (¹HNMR, {¹H}-13C NMR, and APT-13C NMR) and two-dimensional NMR techniques (COSY, NOESY, HMQC and HMBC) was used to achieve the structural elucidation and the complete ¹H and 13C chemical shift assignments of these natural compounds. In addition, the antifungal activity of these compounds against phytopathogenic and human pathogenic fungi was investigated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polymethoxyflavones; Antifungal activity; Citrus aurantifolia.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200004

Acaricidal activity of Amburana cearensis on the cattle tick Rhipicephalus (Boophilus) microplus
Provedor de dados: Ciência Rural
Autores: Dantas,Anne Caroline dos Santos; Araujo,Andreina de Carvalho; Pacheco,Alessandra Gomes Marques; Branco,Alexsandro; Sangioni,Luis Antônio; Almeida,Jackson Roberto Guedes da Silva; Horta,Mauricio Claudio.
ABSTRACT: This experiment was carried out to study the bioacaricidal activity of Amburana cearensis against engorged females of Rhipicephalus (Boophilus) microplus. The crude ethanolic extract from the leaves of A. cearensis was submitted to partition with organic solvents (hexane, chloroform and ethyl acetate) in order of increasing polarity; and evaluated using three treatments at concentrations of 5, 10 and 25mg ml-1. To evaluate the acaricidal activity, engorged females were submitted to the adult immersion test. Parameters analyzed were the weight of females; weight of egg mass; percentage of hatch; reproductive efficiency; expected rate of reproduction; and efficacy. For each extract and concentrating fraction, tests were performed in triplicate....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tick; Control; Acaricid; Phytotherapy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000300536

Ovicidal activity of succinic acid isolated from sisal waste (Agave sisalana) against gastrointestinal nematodes of goats
Provedor de dados: Ciência Rural
Autores: Santos,Nathália Silva de Souza; Santos,Jener David Gonçalves; Santos,Francianne Oliveira; Serra,Taiane Menezes; Lima,Hélimar Gonçalves de; Botura,Mariana Borges; Branco,Alexsandro; Batatinha,Maria José Moreira.
ABSTRACT: This study was conducted to evaluate the in vitro anthelmintic activity of the succinic acid (SA) isolated from sisal waste against gastrointestinal nematodes of goats, using the egg hatching and larvae motility assays. In addition, potential cytotoxicity of SA on Vero cell cultures was investigated by means of MTT (3-4,5-dimethylthiazol-2-yl, 2,5diphenyltetrazolium bromide) test. The SA induced a significant inhibition of egg hatching (P&lt;0.05) at all concentrations tested (60 to 250µg mL-1), and the concentrations to inhibit 50% (EC50) and 90% (EC90) values (mean ± standard deviation) were 90.3±2.8 and 130.6±3.5µg mL-1, respectively. The SA has not shown larvicidal activity. The SA was less toxic to the Vero cells, with the mean percentage of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agave sisalana; Sisal waste; Succinic acid; Anthelmintic; Goats.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000800502