Please use this identifier to cite or link to this item:
|Type:||Artigo de evento|
|Title:||Mimetic Phenoloxidase Activity: Lignin And Chlorolignin Degradation With Low Molecular Weight Chelators|
|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|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.