EQA - Escola de Química e Alimentos
URI permanente desta comunidadehttps://rihomolog.furg.br/handle/1/1610
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3 resultados
Resultados da Pesquisa
- ItemPre-screening of filamentous fungi isolated from a contaminated site in Southern Brazil for bioaugmentation purposes(2008) Santos, Elisane Odriosolla dos; Rosa, Célia Francisca Centeno da; Passos, Cátia Tavares dos; Sanzo, Ana Virgínia Ladeira; Burkert, Janaina Fernandes de Medeiros; Kalil, Susana Juliano; Burkert, Carlos André VeigaFour Aspergillus sp. strains were isolated from contaminated soil in Rio Grande, Southern Brazil. The biodegradation potential of these strains was evaluated using a simple method involving the determination of colony growth rates on plates containing a specific hydrocarbon or petroleum derivative as the only carbon source. The LEBM1 strain presented a high tolerance level to BTX. It was the only strain capable of growth on all the media, with growth rates varying from 1.3 to 2.2 mm/day. The LEBM2 strain presented the potential for phenol degradation, while the LEBM3 strain could be used for gasoline, diesel oil, hexane and chlorobenzene.
- ItemBiodegradação de fenol por uma nova linhagem de Aspergillus sp. isolada de um solo contaminado do sul do Brasil(2009) Passos, Cátia Tavares dos; Burkert, Janaina Fernandes de Medeiros; Kalil, Susana Juliano; Burkert, Carlos André VeigaThe main goal of this work was to study the biodegradation of phenol in batch mode by a filamentous fungus isolated from a contaminated site in Southern Brazil. A better performance was obtained by previous adaptation of the microorganism to the toxic chemical. A 23 experimental design was proposed and it could be observed total phenol degradation in 72 h using 500 mg L-1 glucose, inoculum of 20% and agitation of 200 rpm, resulting a biodegradation rate of 3.76 mg L-1 h-1. In relation to phenol tolerance, Aspergillus sp. LEBM2 was able to consume up to 989 ± 15 mg L-1.
- ItemBiodegradation of phenol by free and encapsulated cells of a new Aspergillus sp. isolated from a contaminated site in southern Brazil(2010) Passos, Cátia Tavares dos; Michelon, Mariano; Burkert, Janaina Fernandes de Medeiros; Kalil, Susana Juliano; Burkert, Carlos André VeigaThe aim of this study was to compare the biodegradation performance of phenol by using free and encapsulated cells of a new Aspergillus sp. strain isolated from a crude oil contaminated soil in southern Brazil. In batch cultures, maximum degradation rates were not significantly different between free and encapsulated cells, but a decrease in adaptation time for encapsulated ones was observed. This fact indicates the presence of a microenvironment that is more favorable to biodegradation inside encapsulated cells, because of the protector effect of gel matrix, which reduces abiotic stress. Encapsulated filamentous fungus Aspergillus sp. LEBM2 showed a promising application in bioaugmentation processes, reaching maximum phenol degradation rate of 7.71 ± 0.21 mg/l.h for an initial phenol concentration of 500 mg/l.