Ponencias - Departamento de Farmacia
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Ítem Acceso Abierto Relation ``structure-anticoagulant activity´´ using topologic indices(2016) Torres Gómez, Luis Alberto; Hernández Barreto, Enoel; Machin Galarza, Laura; Universidad Central "Marta Abreu" de Las Villas. Facultad de Química y Farmacia. Departamento de Farmacia; Universidad de la Habana. Instituto de Farmacia y AlimentosThe calculation methodology MODESLAB was used to modelate the anticoagulant activity of different drugs. The spectral moments of the adjacent matrix were determinated using different parameters, between the edges of the molecular graph with suppressed hydrogens, leading to the classification in active or inactives a total of 985 compounds in the main diagonal. The calculated descriptors were employed in a serie of training, as well as in a prediction one, in order to obtain and evaluate the model, respectively. A discriminant function for the anticoagulant activity was defined by the use of the training serie, leading to a good total classification of 92.29%. The external prediction one, with a total of 146 compounds, was used to validate the model, leading to a good total classification of 95.89%. The links´s contribution to the activity (understructural analysis) allowed the identification of the positive isocontribution´s zones or pharmacophere, as well as the negative isocontribution´s ones, that can functionate as groups of transport for the involved molecules; which gives us an idea of the sites that can interact with a determinated receptor, as well as those that facilitate the drug´s arriving to its site of actionÍtem Acceso Abierto Potent antioxidant activity of Kigelia africana flower fractions on cell-free systems(2017) Hernández Barreto, Enoel; Torres Gómez, Luis Alberto; Ribalta Ribalta, Venancio; Armas González, Yuniesky; Ruz Sanjuan, Vivian; González Bedia, Mirtha Mayra; Universidad Central "Marta Abreu" de Las Villas. Facultad de Química y Farmacia. Departamento de Farmacia; Universidad de la Habana. Instituto de Farmacia y AlimentosThe aim of this work is to explore the antioxidant properties of three organic fractions obtained from Kigelia africana flowers on several cell-free systems. The vegetal material was subject to extraction with ethanol (90%) by soxhlet apparatus. Ethanolic (EF), ethylacetate (EAF) and buthanolic (BF) fractions were obtained from crude ethanolic solution by liquid-liquid extraction procedures. Total Phenolic content (TPC) and Total Flavonoids content (TFC) were determined by FolinCiocalteu and AlCl 3 spectrophotometric methods respectively. The antioxidant and radical scavenging profile was assessed through 2, 2 – diphenyl – 1 – picrylhydrazyl (DPPH), Reducting power, Total antioxidant activity and Metal Chelating tests. Quercetin, rutin, gallic acid, hesperidin, ascorbic acid and Na2EDTA were used as references. The antioxidant potency was strongly related with TPC and TFC values. This study reveals for the first time the antioxidant properties of K. africana flower fractions on cell-free systems.