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Horseradish peroxidase and hematin as biocatalysts for alizarin degradation using hydrogen peroxide / Silvina Pirillo in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6745–6752 Titre : Horseradish peroxidase and hematin as biocatalysts for alizarin degradation using hydrogen peroxide Type de document : texte imprimé Auteurs : Silvina Pirillo, Auteur ; Fernando Sebastian Garcia Einschlag, Auteur ; Elsa H. Rueda, Auteur Année de publication : 2010 Article en page(s) : pp 6745–6752 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Peroxidase  Hematin  Biocatalysts. Résumé : Degradation of organic dyes from the textile industry is a matter of enormous environmental concern. The horseradish peroxidase enzyme is known for its capacity to remove phenolic compounds and aromatic amines from aqueous solutions and also to decolorize textile effluents. This study evaluates the potential of the both enzyme horseradish peroxidase (HRP) and its biomimetic hematin in the decolorization of alizarin. We describe an UV−visible study of alizarin elimination from aqueous solutions by polymerization using HRP or hematin as catalysts, hydrogen peroxide as oxidant, and HCl as coagulant. The effects of the initial dye concentration and the temperature on the decolorization efficiencies, attained with each catalyst after 2 h of reaction time, are reported. Alizarin removal with HRP/H2O2 achieved the highest elimination level (88%) when the dye concentration was 50 mg/L. At the same dye concentration a degradation of 97% was obtained using hematin as biocatalyst. A comparative analysis of time-resolved spectra and dissolved oxygen profiles is presented. The oxygen profiles found for hematin/H2O2/alizarin and HRP/H2O2/alizarin systems are clearly different, pointing to oxygen consumption for hematin and oxygen production for peroxidase. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901528y [article] Horseradish peroxidase and hematin as biocatalysts for alizarin degradation using hydrogen peroxide [texte imprimé] / Silvina Pirillo, Auteur ; Fernando Sebastian Garcia Einschlag, Auteur ; Elsa H. Rueda, Auteur . - 2010 . - pp 6745–6752. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6745–6752 Mots-clés : Peroxidase  Hematin  Biocatalysts. Résumé : Degradation of organic dyes from the textile industry is a matter of enormous environmental concern. The horseradish peroxidase enzyme is known for its capacity to remove phenolic compounds and aromatic amines from aqueous solutions and also to decolorize textile effluents. This study evaluates the potential of the both enzyme horseradish peroxidase (HRP) and its biomimetic hematin in the decolorization of alizarin. We describe an UV−visible study of alizarin elimination from aqueous solutions by polymerization using HRP or hematin as catalysts, hydrogen peroxide as oxidant, and HCl as coagulant. The effects of the initial dye concentration and the temperature on the decolorization efficiencies, attained with each catalyst after 2 h of reaction time, are reported. Alizarin removal with HRP/H2O2 achieved the highest elimination level (88%) when the dye concentration was 50 mg/L. At the same dye concentration a degradation of 97% was obtained using hematin as biocatalyst. A comparative analysis of time-resolved spectra and dissolved oxygen profiles is presented. The oxygen profiles found for hematin/H2O2/alizarin and HRP/H2O2/alizarin systems are clearly different, pointing to oxygen consumption for hematin and oxygen production for peroxidase. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901528y