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Type: Artigo de evento
Title: Mimetic Phenoloxidase Activity: Lignin And Chlorolignin Degradation With Low Molecular Weight Chelators
Author: Duran Nelson
Santiago Mariangela
Parra Carolina
Rodriguez Jaime
Abstract: The use of natural chelating agents produced by fungi and bacteria that are called siderophores shows a high affinity constant for metals like iron represents a good alternative for resolving the problems associated with the potential environmental impact produced by synthetic chelators such as EDTA or DTPA. In the study of phenoloxidase activity, the pH, ionic strength (μ), temperature and o-dianisidine conditions were optimized. The properties of four model siderophores, desferrioxamine (DB), acetohydroxamic acid (AHA), 2,3-dihydroxybenzoic acid (DHBA) and 3,4-dihydroxyphenyl acetic acid (DHPAA) were studied. At 2:1 DB/Fe(III), 1:1 AHA/Fe(III), 2:1 DHPAA/Fe(III) and 1:1.5 DHBA/Fe(III), the maximum phenoloxidase activities acting on o-dianisidine were observed. A mechanistic study showed that with these conditions all models of siderophores are able to reduce Fe(III) to Fe(II) followed by ferrozine/ o-phenantroline complexation with Fe(II). Isolated lignin and chlorolignins from Kraft E1 effluents were degraded in the presence of all the metal complexes.
Editor: CPPA, Montreal, Canada
Rights: fechado
Identifier DOI: 
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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