Consulta: subjectFacets:"Procyanidins"
Registros recuperados: 4
Data/hora: 01/06/2024 01:29:46

Characterization and biological activity of condensed tannins from tropical forage legumes
Provedor de dados: 86
Autores: Pereira,Tatiana Pires; Modesto,Elisa Cristina; Nepomuceno,Delci de Deus; Oliveira,Osniel Faria de; Freitas,Rafaela Scalise Xavier de; Muir,James Pierre; Dubeux Junior,José Carlos Batista; Almeida,João Carlos de Carvalho.
Abstract: The objective of this work was to characterize condensed tannins (CT) from six tropical forage legumes and to determine their biological activity. The monomers propelargonidin, prodelphinidin and procyanidin were analyzed, as well as extractable condensed tannin (ECT), protein-bound CT (PBCT) and fiber-bound CT (FBCT), molecular weight, degree of polymerization, polydispersity index, and biological activity by protein precipitate by phenols (PPP) of leaves of the legumes Cajanus cajan, Gliricidia sepium, Stylosanthes capitata x Stylosanthes macrocephala (stylo), Flemingia macrophylla, Cratylia argentea, and Mimosa caesalpiniifolia, and of the bark of this latter species. Differences were observed in the concentrations of ECT, PBCT, PPP, and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage legumes; Phenols; Procyanidins; Prodelphinidins; Protein.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000901070

Ascorbate protects (+)-catechin from oxidation both in a pure chemical system and human plasma
Provedor de dados: 48
Autores: LOTITO,SILVINA B; FRAGA,CESAR G.
We evaluated the interaction between ascorbic acid (AA) and (+)-catechin (CTCH) in potassium phosphate solution, pH 7.4 (PPS) and in human plasma. In both systems, the oxidation was started by adding 2,2’-azobis-(2-amidinopropane) clorhidrate (AAPH). The concentrations of AA and CTCH were determined by HPLC using electrochemical detection. In PPS, CTCH was oxidized by AAPH (50 muM), in either the absence or presence of different initial concentrations of AA (25-200 muM). In the presence of AA, CTCH depletion was delayed, an effect that was dependent upon the initial concentration of AA. When 100 muM AA was added after the oxidation had begun, CTCH depletion was arrested for 30 min. The kinetics of AA oxidation by AAPH was also characterized in PPS. AA (100...
Tipo: Journal article
Palavras-chave: Catechins; Antioxidants; Free radicals; Procyanidins.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200015

Membrane effects of Cocoa Procyanidins in Liposomes and Jurkat T Cells
Provedor de dados: 48
Autores: VERSTRAETEN,SANDRA V.; OTEIZA,PATRICIA I.; FRAGA,CÉSAR G.
We investigated the effects of the interaction between flavanols and related procyanidins (dimer to hexamer) with both cell and synthetic membranes, on bilayer fluidity and susceptibility to oxidation. Cocoa derived dimers (0.05 to 1 µg/ml) protected Jurkat T cells from AMVN-mediated oxidation and increased plasma membrane fluidity. These effects occurred in a concentration- and chain length-dependent manner. In liposomes, procyanidins prevented the Fe2+-induced permeabilization of the membrane. Together, these results support the hypothesis that procyanidins could interact with the polar headgroup of lipids, increasing membrane fluidity and also, preventing the access of molecules that could affect membrane integrity
Tipo: Journal article
Palavras-chave: Epicatechin; Free radicals; Lipid oxidation; Membrane fluidity; Membrane permeability; Procyanidins.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200016

Antineoplastic Effect of Procyanidin-rich Extract of Lafoensia Pacari in Lung Carcinoma Cells
Provedor de dados: 52
Autores: Cordeiro,Yonara de Gouveia; Rochetti,Arina Lázaro; Souza,Vinicius Castro; Silva,Edson Roberto da; Scatolini,Antônio Márcio; Genovese,Maria Inés; Yasui,George Shigueki; Fukumasu,Heidge.
Abstract Lafoensia pacari A. St. Hill has been used in traditional medicine as an anti-ulcerogenic and anti-inflammatory. Although there is an ethnopharmacological indication for cancer treatment, only a few studies have demonstrated its possible anticancer activity. Thus, the aims of this study were: (1) to evaluate the antineoplastic effect of L. pacari ethanolic extract (LPE) in lung carcinoma cells, (2) to determine the mode of action of LPE and (3) to identify the substances present in LPE. Human and murine lung cancer cell lines were grown in vitro and treated with different concentrations of LPE. Cell cycle and caspase-3 activity assays were performed in order to verify the mode of action. LC-ESI-MS screening was performed to detect the compounds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antineoplastic effect; Cell cytotoxicity; Medicinal plants; Procyanidins.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100302