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Brazilian Journal of Microbiology

Print version ISSN 1517-8382On-line version ISSN 1678-4405

Abstract

VITALI, Vera Maria Valle; MACHADO, Kátia Maria Gomes; ANDREA, Mara Mercedes de  and  BONONI, Vera Lúcia Ramos. Screening mitosporic fungi for organochlorides degradation. Braz. J. Microbiol. [online]. 2006, vol.37, n.3, pp.256-261. ISSN 1517-8382.  http://dx.doi.org/10.1590/S1517-83822006000300012.

Fifty-five isolates of filamentous fungi were studied regarding their ability to decolorize Remazol brilliant blue R dye. The fungi were isolated from soil in the Baixada Santista region, which is contaminated with industrial residues containing a mixture of organochlorine compounds, mainly hexachlorobenzene. The fungi were grown in liquid malt extract medium with 0.02% of dye and shaken at 200 rpm for 14 days at 28 ± 2ºC. Two types of behavior regarding the dye were observed: adsorption and degradation. Eupenicillium baarnenseSsp1951 and Ssp1952 and Eupenicilliumcrustaceum SSP1953 presented high RBBR decolorization and were then analyzed regarding their ability to degrade 14C-hexachlobenzene (4138.31 mg HCB per kg soil) during a 56 days culture at 28 ± 2ºC. Eupenicillium crustaceum SSP1953 was able to reduce n-hexane soluble 14C-compounds (24.6%) and to form non-extractable 14C-residues (20.5%). The same behavior was also observed in the two E. baarnense strains (Ssp1951 and Ssp1952) but the percentages were lower than those obtained for Eupenicilliumcrustaceum. The main action of Eupenicillium spp on HCB is to transform it into non-extractable 14C-residues as confirmed by the gas chromatography results.

Keywords : RBBR decolorization; soil bioremediation; organochlorine degradation; xenobiotics.

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