Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes

BACKGROUND: Azo and anthraquinone dyes have been successfully decolorized using enzymatic and biomimetic homogeneous systems.1,2 Hematin, a horseradish peroxidase (HRP) biomimetic, immobilized on chitosan via glutaraldehyde coupling was able to decolorize Alizarin Red S and Orange II solutions. A Do...

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Publicado:	2015
Materias:	Acid Orange II Alizarin Red S Chitosan Peroxidase Supported hematin Alizarin Aromatic compounds Azo dyes Biomimetics Catalyst activity Catalysts Chitin Citrus fruits Ketones Silicon compounds Spectrophotometry Surface analysis Alizarin Red Aminopropyltriethoxysilane Heterogeneous catalyst Response surface analysis Spectro-photometric method Catalyst supports 3 aminopropyltriethoxysilane anthraquinone azo dye chitosan glutaraldehyde hematin iron porphyrin Article atomic emission spectrometry catalyst catalytic efficiency chemical structure decolorization experimental design infrared spectroscopy response surface method stereospecificity ultraviolet spectrophotometry Armoracia rusticana
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02682575_v90_n9_p1665_Cordoba http://hdl.handle.net/20.500.12110/paper_02682575_v90_n9_p1665_Cordoba
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_02682575_v90_n9_p1665_Cordoba
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spelling	paper:paper_02682575_v90_n9_p1665_Cordoba2023-06-08T15:24:11Z Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes Acid Orange II Alizarin Red S Chitosan Peroxidase Supported hematin Alizarin Aromatic compounds Azo dyes Biomimetics Catalyst activity Catalysts Chitin Chitosan Citrus fruits Ketones Silicon compounds Spectrophotometry Surface analysis Acid Orange II Alizarin Red Aminopropyltriethoxysilane Heterogeneous catalyst Peroxidase Response surface analysis Spectro-photometric method Supported hematin Catalyst supports 3 aminopropyltriethoxysilane anthraquinone azo dye chitosan glutaraldehyde hematin iron porphyrin Article atomic emission spectrometry catalyst catalytic efficiency chemical structure decolorization experimental design infrared spectroscopy response surface method stereospecificity ultraviolet spectrophotometry Armoracia rusticana BACKGROUND: Azo and anthraquinone dyes have been successfully decolorized using enzymatic and biomimetic homogeneous systems.1,2 Hematin, a horseradish peroxidase (HRP) biomimetic, immobilized on chitosan via glutaraldehyde coupling was able to decolorize Alizarin Red S and Orange II solutions. A Doehlert experimental design and response surface analysis was applied to determine conditions for optimal mass of catalyst and catalytic efficiency of the immobilization procedure. RESULTS: The catalysts with supported hematin showed 33% activity (relative to homogeneous hematin as 100%) in decolorization reactions. After six reuses the catalytic activity was maintained at 60% of the initial one. Hematin anchoring to chitosan without alteration of the iron-porphyrin ring was confirmed by ICP, FTIR and UV/visible spectrophotometric methods. In addition, the effect on hematin activity in the decolorization of aminopropyltriethoxysilane (APTS) as a 'spacer arm' between hematin-glutaraldehyde and chitosan was studied. CONCLUSIONS: An economical heterogeneous catalyst alternative to HRP has been obtained. The spacer arm improves the catalyst's performance with activities as high as 57% relative to homogeneous hematin. These results support the notion that the activity loss of supported hematin is caused by the restricted access to Fe of the bulky phenolic dyes. © 2014 Society of Chemical Industry. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02682575_v90_n9_p1665_Cordoba http://hdl.handle.net/20.500.12110/paper_02682575_v90_n9_p1665_Cordoba
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Acid Orange II Alizarin Red S Chitosan Peroxidase Supported hematin Alizarin Aromatic compounds Azo dyes Biomimetics Catalyst activity Catalysts Chitin Chitosan Citrus fruits Ketones Silicon compounds Spectrophotometry Surface analysis Acid Orange II Alizarin Red Aminopropyltriethoxysilane Heterogeneous catalyst Peroxidase Response surface analysis Spectro-photometric method Supported hematin Catalyst supports 3 aminopropyltriethoxysilane anthraquinone azo dye chitosan glutaraldehyde hematin iron porphyrin Article atomic emission spectrometry catalyst catalytic efficiency chemical structure decolorization experimental design infrared spectroscopy response surface method stereospecificity ultraviolet spectrophotometry Armoracia rusticana
spellingShingle	Acid Orange II Alizarin Red S Chitosan Peroxidase Supported hematin Alizarin Aromatic compounds Azo dyes Biomimetics Catalyst activity Catalysts Chitin Chitosan Citrus fruits Ketones Silicon compounds Spectrophotometry Surface analysis Acid Orange II Alizarin Red Aminopropyltriethoxysilane Heterogeneous catalyst Peroxidase Response surface analysis Spectro-photometric method Supported hematin Catalyst supports 3 aminopropyltriethoxysilane anthraquinone azo dye chitosan glutaraldehyde hematin iron porphyrin Article atomic emission spectrometry catalyst catalytic efficiency chemical structure decolorization experimental design infrared spectroscopy response surface method stereospecificity ultraviolet spectrophotometry Armoracia rusticana Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
topic_facet	Acid Orange II Alizarin Red S Chitosan Peroxidase Supported hematin Alizarin Aromatic compounds Azo dyes Biomimetics Catalyst activity Catalysts Chitin Chitosan Citrus fruits Ketones Silicon compounds Spectrophotometry Surface analysis Acid Orange II Alizarin Red Aminopropyltriethoxysilane Heterogeneous catalyst Peroxidase Response surface analysis Spectro-photometric method Supported hematin Catalyst supports 3 aminopropyltriethoxysilane anthraquinone azo dye chitosan glutaraldehyde hematin iron porphyrin Article atomic emission spectrometry catalyst catalytic efficiency chemical structure decolorization experimental design infrared spectroscopy response surface method stereospecificity ultraviolet spectrophotometry Armoracia rusticana
description	BACKGROUND: Azo and anthraquinone dyes have been successfully decolorized using enzymatic and biomimetic homogeneous systems.1,2 Hematin, a horseradish peroxidase (HRP) biomimetic, immobilized on chitosan via glutaraldehyde coupling was able to decolorize Alizarin Red S and Orange II solutions. A Doehlert experimental design and response surface analysis was applied to determine conditions for optimal mass of catalyst and catalytic efficiency of the immobilization procedure. RESULTS: The catalysts with supported hematin showed 33% activity (relative to homogeneous hematin as 100%) in decolorization reactions. After six reuses the catalytic activity was maintained at 60% of the initial one. Hematin anchoring to chitosan without alteration of the iron-porphyrin ring was confirmed by ICP, FTIR and UV/visible spectrophotometric methods. In addition, the effect on hematin activity in the decolorization of aminopropyltriethoxysilane (APTS) as a 'spacer arm' between hematin-glutaraldehyde and chitosan was studied. CONCLUSIONS: An economical heterogeneous catalyst alternative to HRP has been obtained. The spacer arm improves the catalyst's performance with activities as high as 57% relative to homogeneous hematin. These results support the notion that the activity loss of supported hematin is caused by the restricted access to Fe of the bulky phenolic dyes. © 2014 Society of Chemical Industry.
title	Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
title_short	Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
title_full	Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
title_fullStr	Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
title_full_unstemmed	Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes
title_sort	modified chitosan as an economical support for hematin: application in the decolorization of anthraquinone and azo dyes
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02682575_v90_n9_p1665_Cordoba http://hdl.handle.net/20.500.12110/paper_02682575_v90_n9_p1665_Cordoba
_version_	1768546113638367232

Modified chitosan as an economical support for hematin: Application in the decolorization of anthraquinone and azo dyes

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