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Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator

The biosynthetic utilization of laccase/mediator system is problematic because the use of organic cosolvent causes significant inhibition of laccase activity. This work explored how the organic cosolvent impacts on the laccase catalytic capacity towards 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfon...

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Detalles Bibliográficos
Autores principales: Liu, Hao, Zhou, Pandeng, Wu, Xing, Sun, Jianliang, Chen, Shicheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6332252/
https://www.ncbi.nlm.nih.gov/pubmed/26556325
http://dx.doi.org/10.3390/molecules201119672
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author Liu, Hao
Zhou, Pandeng
Wu, Xing
Sun, Jianliang
Chen, Shicheng
author_facet Liu, Hao
Zhou, Pandeng
Wu, Xing
Sun, Jianliang
Chen, Shicheng
author_sort Liu, Hao
collection PubMed
description The biosynthetic utilization of laccase/mediator system is problematic because the use of organic cosolvent causes significant inhibition of laccase activity. This work explored how the organic cosolvent impacts on the laccase catalytic capacity towards 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in aqueous solution. Effects of acetone on the kinetic constants of laccase were determined and the results showed K(m) and V(max) varied exponentially with increasing acetone content. Acetone as well as some other cosolvents could transform ABTS radicals into its reductive form. The content of acetone in media significantly affected the radical scavenging rates. Up to 95% of the oxidized ABTS was successfully recovered in 80% (v/v) acetone in 60 min. This allows ABTS to be recycled at least six times with 70%–75% of active radicals recovered after each cycle. This solvent-based recovery strategy may help improve the economic feasibility of laccase/ABTS system in biosynthesis.
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spelling pubmed-63322522019-01-24 Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator Liu, Hao Zhou, Pandeng Wu, Xing Sun, Jianliang Chen, Shicheng Molecules Communication The biosynthetic utilization of laccase/mediator system is problematic because the use of organic cosolvent causes significant inhibition of laccase activity. This work explored how the organic cosolvent impacts on the laccase catalytic capacity towards 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in aqueous solution. Effects of acetone on the kinetic constants of laccase were determined and the results showed K(m) and V(max) varied exponentially with increasing acetone content. Acetone as well as some other cosolvents could transform ABTS radicals into its reductive form. The content of acetone in media significantly affected the radical scavenging rates. Up to 95% of the oxidized ABTS was successfully recovered in 80% (v/v) acetone in 60 min. This allows ABTS to be recycled at least six times with 70%–75% of active radicals recovered after each cycle. This solvent-based recovery strategy may help improve the economic feasibility of laccase/ABTS system in biosynthesis. MDPI 2015-11-04 /pmc/articles/PMC6332252/ /pubmed/26556325 http://dx.doi.org/10.3390/molecules201119672 Text en © 2015 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Liu, Hao
Zhou, Pandeng
Wu, Xing
Sun, Jianliang
Chen, Shicheng
Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title_full Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title_fullStr Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title_full_unstemmed Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title_short Radical Scavenging by Acetone: A New Perspective to Understand Laccase/ABTS Inactivation and to Recover Redox Mediator
title_sort radical scavenging by acetone: a new perspective to understand laccase/abts inactivation and to recover redox mediator
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6332252/
https://www.ncbi.nlm.nih.gov/pubmed/26556325
http://dx.doi.org/10.3390/molecules201119672
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