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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Study of secondary metabolites of cytotoxic potential isolates of the fungus Paecilomyces lilacinus recovered from marine sediments of costa cearense / Estudo do potencial citotÃxico dos metabÃlitos secundÃrios isolados do fungo marinho Paecilomyces lilacinus recuperado de sedimentos da costa cearense

Emanuela Ximenes Farias 05 February 2014 (has links)
Este trabalho descreve o estudo de bioprospecÃÃo de metabÃlitos secundÃrios citotÃxicos do PecÃm-CE. Inicialmente, foi realizado o estudo cinÃtico da produÃÃo de metabÃlitos secundÃrios por P. lilacinus cultivado no meio de batata-dextrose (BD) durante 7, 14 21 e 28 dias. AtravÃs da anÃlise cromatogrÃfica dos extratos, bem como dos resultados de atividade citotÃxica dos mesmos, frente à linhagem de cÃlula tumoral HCT -116 (cÃncer de cÃlon), foi possÃvel selecionar o extrato oriundo do crescimento do fungo por 14 dias (inibiÃÃo de crescimento:85,7 %) como o mais citotÃxico. O fracionamento bioguiado do extrato orgÃnico do fungo cultivado por 14 dias em grande escala levou ao isolamento dos esterÃides wortimanina e 11-deacetoxiwortimanina, ambos inÃditos no gÃnero Paecilomyces . Os metabÃlitos secundÃrios foram isolados at ravÃs de mÃtodos cromatogrÃficos usuais e CLAE (Cromatografia lÃquida de alta eficiÃncia). A caracterizaÃÃo estrutural foi realizada atravÃs do uso de mÃtodos espectromÃtricos, especialmente espectrometria de massas, ressonÃncia magnÃtica nuclear (1H e 13C) e infravermelho, alÃm de comparaÃÃo de dados da literatura. TambÃm foi realizado um estudo de desreplicaÃÃo do extrato, o qual sugeriu a presenÃa dos compostos ciclosinefungina, estatana A, virescenosideo -D, (+)-esclerotiorina, 2'-Amino-2'-deoxiguanosina , fumaramidimicina e deoxinivalenol, todos inÃditos no gÃnero Paecilomyces produzidos por Paecilomyces lilacinus (cepa BRF053) recuperado de sedimentos da praia. / The bioprospection of cytotoxic secondary metabolites produced by Paecilomyces lilacinus(fungal strain BRF053) recovered from sediments collected at PecÃm beach, Cearà state, was investigated. First, the production of compounds by the fungal strain was performed by culturing the microorganism in potato-dextrose broth (PDB) for 7,14,21 and 28 days. Both HPLC analysis and cytotoxic activity(tumor cell line HCT-116) of the extracts from each period of culture revealed 1 4 days as the optimum time for producing cytotoxic compounds (growth inhibition 85.7 %). Bioguided fractionation of the organic extract from the fungus cultured in large scale under the same conditions (14 days) allowed the isolation of the steroids wortimann in and 11-deacetox ywortiman n in, both new compounds in Paecilomyces. These compounds were isolated by chromatography column and HPLC, and their structures were elucidated by spectrometric methods (HRMS, 1H, 13C NMR, and IR) besides comparison with literature data. Dereplication of the extract by LC -MS suggested the presence of cyclosinefungin, stanna A, virescenoside-D, (+)-esclerotiorin, 2'-Amino-2'-deoxiguanosine, fumaramidimicin e deoxy nivalenol, all of the new compounds in Paecilomyces.

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