Abstract
Rhizopus nigricans, isolated from an industrial effluent (paper mill), was resistant to pentachlorophenol (PCP) in Petri dishes and in submerged cultures (100 and 25 mg l−1 respectively). It was shown that this strain of R. nigricans can remove PCP in submerged culture. When 12.5 mg of PCPl−1 were added at 48 h, this compound had been completely removed by 144h. Results indicated that the fungus did not produce extracellular lignin peroxidase (LiP) and laccase, but extracellular phenoloxidase production was observed. The synthesis of the latter enzyme was stimulated by the presence of PCP and/or tyrosine. These results indicate that this fungus, and probably other filamentous fungi, have an interesting potential to be used in processes for chlorophenol biodegradation.
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