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Biotransformações de cetonas aromáticas e cíclicas promovidas por fungos / Biotransformations of cyclic and aromatic ketones by fungi

Nesse trabalho avaliamos o potencial enzimático de diferentes linhagens de fungos, visando determinar a presença de mono-oxigenases capazes de oxidar cetonas aromáticas e cíclicas. Todas as linhagens empregadas apresentaram atividade de álcool desidrogenase e Baeyer-Villiger mono-oxigenases. Adicionalmente foram sintetizadas oito moléculas bi-funcionalizadas com grupos sulfeto, seleneto e carbonila (cetona). Os produtos das reações biocatalisadas foram isolados e caracterizados. / In this work, we evaluated the enzymatic potential of different Aspergillus strains, through the biotransformations of two substrates: 2- and 4-methylcyclohexanone (1a e 1b). All the strains employed showed alcohol dehydrogenase and Baeyer-Villiger monooxygenase (CPMO and CHMO) activities. These enzymes can perform ketone biorreduction and oxidation. Using the A. terreus SSP 1498 selected from the screening study, we prepared alcohols and lactones in good enantiosselectivity. In this way, other fungal strains were studied aiming to determine the presence of monooxygenase activity by means of the biotransformation of aromatic ketones. Like the Aspergillus, we observed that all strains used in this study showed alcohol dehydrogenase and Baeyer-Villiger monooxygenase (APMO) activities. We selected 1-phenyl-etanone and its para substituted derivates as substrates. Additionally, we synthesized eight examples of bi-functionalized compounds with sulfide, selenide and ketone groups. These compounds were submitted to the action of enzymatic system of different fungi which were selected from the initial screening. The products from the biotransformation were isolated and characterized.

Identiferoai:union.ndltd.org:IBICT/oai:teses.usp.br:tde-13032007-123741
Date07 April 2005
CreatorsArtur Franz Keppler
ContributorsLeandro Helgueira de Andrade, Cláudio Di Vitta, José Augusto Rosário Rodrigues
PublisherUniversidade de São Paulo, Química, USP, BR
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis
Sourcereponame:Biblioteca Digital de Teses e Dissertações da USP, instname:Universidade de São Paulo, instacron:USP
Rightsinfo:eu-repo/semantics/openAccess

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