Impacts of redox-mediator type on trace organic contaminants degradation by laccase: Degradation efficiency, laccase stability and effluent toxicity

Ashe, B; Nguyen, LN; Hai, FI; Lee, DJ; van de Merwe, JP; Leusch, FDL; Price, WE; Nghiem, LD

Impacts of redox-mediator type on trace organic contaminants degradation by laccase: Degradation efficiency, laccase stability and effluent toxicity

Ashe, B Nguyen, LN Hai, FI Lee, DJ van de Merwe, JP Leusch, FDL Price, WE Nghiem, LD

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: International Biodeterioration and Biodegradation, 2016, 113, pp. 169-176
Issue Date:: 2016-09-01

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Field	Value	Language
dc.contributor.author	Ashe, B
dc.contributor.author	Nguyen, LN
dc.contributor.author	Hai, FI
dc.contributor.author	Lee, DJ
dc.contributor.author	van de Merwe, JP
dc.contributor.author	Leusch, FDL
dc.contributor.author	Price, WE
dc.contributor.author	Nghiem, LD
dc.date.accessioned	2022-02-09T21:36:33Z
dc.date.available	2022-02-09T21:36:33Z
dc.date.issued	2016-09-01
dc.identifier.citation	International Biodeterioration and Biodegradation, 2016, 113, pp. 169-176
dc.identifier.issn	0964-8305
dc.identifier.issn	1879-0208
dc.identifier.uri	http://hdl.handle.net/10453/154358
dc.description.abstract	This study compares the effectiveness of seven redox-mediating compounds namely, 1-hydrozybenzotriazole (HBT), N-hydroxyphthalimide (HPI), 2,2,6,6-Tetramethyl-1-piperidinyloxy (TEMPO), violuric acid (VA), syringaldehyde (SA), vanillin (VA), and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), which follow distinct oxidation pathways, for the degradation of trace organic contaminants (TrOCs). These redox-mediators were investigated for improved degradation of four TrOCs showing resistance to degradation by crude laccase from the white-rot fungus Pleurotus ostreatus. ABTS and VA achieved the highest degradation of the phenolic compounds (i.e., oxybenzone and pentachlorophenol), whereas the non-phenolic compounds (i.e., naproxen and atrazine) were best removed using VA or HBT. This implies that the non-phenolic compounds are more effectively removed by the radical species generated by the [Formula presented] type mediators (i.e., VA and HBT), while removal of the phenolic compounds may depend more on the stability and the redox potential of the radicals generated from the mediator, irrespective of the type. Notably, enzyme stability was greatly affected by the [Formula presented] type mediators but it was compensated by their rapid degradation capacity. Overall, VA and HBT ([Formula presented] type) appear to be the best mediators for enhanced degradation of the selected compounds without causing significant toxicity in the effluent.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	International Biodeterioration and Biodegradation
dc.relation.isbasedon	10.1016/j.ibiod.2016.04.027
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	05 Environmental Sciences, 06 Biological Sciences
dc.subject.classification	Biotechnology
dc.title	Impacts of redox-mediator type on trace organic contaminants degradation by laccase: Degradation efficiency, laccase stability and effluent toxicity
dc.type	Journal Article
utslib.citation.volume	113
utslib.location.activity	Sydney, AUSTRALIA
utslib.for	05 Environmental Sciences
utslib.for	06 Biological Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2022-02-09T21:36:32Z
pubs.publication-status	Published
pubs.volume	113

Abstract:

This study compares the effectiveness of seven redox-mediating compounds namely, 1-hydrozybenzotriazole (HBT), N-hydroxyphthalimide (HPI), 2,2,6,6-Tetramethyl-1-piperidinyloxy (TEMPO), violuric acid (VA), syringaldehyde (SA), vanillin (VA), and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), which follow distinct oxidation pathways, for the degradation of trace organic contaminants (TrOCs). These redox-mediators were investigated for improved degradation of four TrOCs showing resistance to degradation by crude laccase from the white-rot fungus Pleurotus ostreatus. ABTS and VA achieved the highest degradation of the phenolic compounds (i.e., oxybenzone and pentachlorophenol), whereas the non-phenolic compounds (i.e., naproxen and atrazine) were best removed using VA or HBT. This implies that the non-phenolic compounds are more effectively removed by the radical species generated by the [Formula presented] type mediators (i.e., VA and HBT), while removal of the phenolic compounds may depend more on the stability and the redox potential of the radicals generated from the mediator, irrespective of the type. Notably, enzyme stability was greatly affected by the [Formula presented] type mediators but it was compensated by their rapid degradation capacity. Overall, VA and HBT ([Formula presented] type) appear to be the best mediators for enhanced degradation of the selected compounds without causing significant toxicity in the effluent.

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http://hdl.handle.net/10453/154358