Navegando por Assunto "Glicosidases"

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Ocorrência de inibidores de glicosidases em cianobactérias e microalgas dos estados do Amapá e Tocantins
(Universidade Federal do Pará, 2015-08-13) SILVA, Vivian Cassia Oliveira da; XAVIER, Luciana Pereira; http://lattes.cnpq.br/6207860145204571
Cyanobacteria are presented as a new source of secondary metabolites for the production of bio-products in many industrial sectors and are used primarily because of its easy cultivation, using few nutritional sources, as well as a large biomass production. Until now we don't have many report in literature of cyanobacteria from amazon, as well as their metabolites and their use in bioproducts. Glycosidases are enzymes of extreme importance as targets for developing drugs that are used for the treatment of various diseases, as well as their inhibitors. This study aimed to identify 24 samples of cyanobacteria and microalgae from the states of Tocantins and Amapá, isolates that produce these inhibitors, as well as extract, fractionate and identify them. Initially, the detection test in petri dishes with esculin the substrate for glycosidase inhibitors has been standardized and the extraction methodology. As a result there was glucosidase inhibitory activity of crude extract and the methanol fraction of four samples (Synechococcus sp, Monoraphydium, P29 and Limnotrix sp), inhibitory activity was detected in the aqueous fractions of any culture. Two methanolic fractions that showed activity was selected for potential assay conducting inhibiting α-glycosidase face with the substrate p-nitrophenyl α-D-glucopyranoside and β-glucosidase to the substrate p-nitrophenyl β-D-glucopyranoside, where both samples had a higher percentage of inhibition for α-glucosidase compared to β-glucosidase.