Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1

Azo dyes are widely used in textile industries. A significant portion of these recalcitrant dyes are being discharged to the natural waters. Due to their low biodegradability they pose serious pollution problems if untreated. In this work, decolourization studies of Acid Red 1 (AR1) by laccase enzym...

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Autores principales:	G. Ranimol, Chinju Paul, Swetha Sunkar
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	azo dye laccase mediator nanofibers pvp zein Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/01c2c8601702443daea717f51532f810
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spelling	oai:doaj.org-article:01c2c8601702443daea717f51532f8102021-12-02T07:40:11ZOptimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 10273-12231996-973210.2166/wst.2021.200https://doaj.org/article/01c2c8601702443daea717f51532f8102021-11-01T00:00:00Zhttp://wst.iwaponline.com/content/84/10-11/2703https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Azo dyes are widely used in textile industries. A significant portion of these recalcitrant dyes are being discharged to the natural waters. Due to their low biodegradability they pose serious pollution problems if untreated. In this work, decolourization studies of Acid Red 1 (AR1) by laccase enzyme immobilized onto zein–polyvinyl pyrrolidone (PVP) composite nanofiber is done. The nanofibers were characterized by scanning electron microscopy (SEM) and Fourier-transform infrared (FTIR) analysis. pH and temperature profiles of immobilized enzyme were found to be broader than its free counterpart. The Km value was found to be 0.243 mM for free laccase and 0.958 mM for immobilized laccase. Similarly, Vmax for the free enzyme was 3.572 U/mg compared to 2.48 U/mg of immobilized laccase. The relative activity of immobilized laccase was 64.91% after storage for 30 days at room temperature while it was 28.64% for free laccase. The temperature and pH for AR 1 decolorization were optimized and was found to be 60 °C and 5, respectively. Also, decolorization percentage was found to be 91.67% for immobilized laccase and 72.03% of free laccase in the presence of natural mediators like vanillin. From phytotoxicity studies it was found that the germination rate, shoot and root length was increased compared to untreated dye. Therefore, zein–PVP nanofiber immobilized laccase could be an ideal candidate for the textile dye decolorization. HIGHLIGHTS Textile effluents cause serious pollution problem in the environment.; Effectiveness of laccase enzyme in the decolorization of Acid Red-1 is studied.; Laccase was used either in the free form as well as immobilized in the zein–polyvinyl pyrrolidone nanofiber membrane.; The immobilized enzyme showed greater capacity for decolorization.;G. RanimolChinju PaulSwetha SunkarIWA Publishingarticleazo dyelaccasemediatornanofiberspvpzeinEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 10-11, Pp 2703-2717 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	azo dye laccase mediator nanofibers pvp zein Environmental technology. Sanitary engineering TD1-1066
spellingShingle	azo dye laccase mediator nanofibers pvp zein Environmental technology. Sanitary engineering TD1-1066 G. Ranimol Chinju Paul Swetha Sunkar Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
description	Azo dyes are widely used in textile industries. A significant portion of these recalcitrant dyes are being discharged to the natural waters. Due to their low biodegradability they pose serious pollution problems if untreated. In this work, decolourization studies of Acid Red 1 (AR1) by laccase enzyme immobilized onto zein–polyvinyl pyrrolidone (PVP) composite nanofiber is done. The nanofibers were characterized by scanning electron microscopy (SEM) and Fourier-transform infrared (FTIR) analysis. pH and temperature profiles of immobilized enzyme were found to be broader than its free counterpart. The Km value was found to be 0.243 mM for free laccase and 0.958 mM for immobilized laccase. Similarly, Vmax for the free enzyme was 3.572 U/mg compared to 2.48 U/mg of immobilized laccase. The relative activity of immobilized laccase was 64.91% after storage for 30 days at room temperature while it was 28.64% for free laccase. The temperature and pH for AR 1 decolorization were optimized and was found to be 60 °C and 5, respectively. Also, decolorization percentage was found to be 91.67% for immobilized laccase and 72.03% of free laccase in the presence of natural mediators like vanillin. From phytotoxicity studies it was found that the germination rate, shoot and root length was increased compared to untreated dye. Therefore, zein–PVP nanofiber immobilized laccase could be an ideal candidate for the textile dye decolorization. HIGHLIGHTS Textile effluents cause serious pollution problem in the environment.; Effectiveness of laccase enzyme in the decolorization of Acid Red-1 is studied.; Laccase was used either in the free form as well as immobilized in the zein–polyvinyl pyrrolidone nanofiber membrane.; The immobilized enzyme showed greater capacity for decolorization.;
format	article
author	G. Ranimol Chinju Paul Swetha Sunkar
author_facet	G. Ranimol Chinju Paul Swetha Sunkar
author_sort	G. Ranimol
title	Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
title_short	Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
title_full	Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
title_fullStr	Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
title_full_unstemmed	Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1
title_sort	optimization and efficacy studies of laccase immobilized on zein-polyvinyl pyrrolidone nano fibrous membrane in decolorization of acid red 1
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/01c2c8601702443daea717f51532f810
work_keys_str_mv	AT granimol optimizationandefficacystudiesoflaccaseimmobilizedonzeinpolyvinylpyrrolidonenanofibrousmembraneindecolorizationofacidred1 AT chinjupaul optimizationandefficacystudiesoflaccaseimmobilizedonzeinpolyvinylpyrrolidonenanofibrousmembraneindecolorizationofacidred1 AT swethasunkar optimizationandefficacystudiesoflaccaseimmobilizedonzeinpolyvinylpyrrolidonenanofibrousmembraneindecolorizationofacidred1
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Optimization and efficacy studies of Laccase immobilized on Zein-Polyvinyl pyrrolidone nano fibrous membrane in decolorization of Acid Red 1

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